mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 19:26:40 +07:00
675605c1c8
Add basic support for the sii902x RGB -> HDMI bridge. This driver does not support audio output yet. Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com> Tested-by: Nicolas Ferre <nicolas.ferre@atmel.com> Acked-by: Archit Taneja <architt@codeaurora.org> Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com> --- Changes in v8: - remove useless headers inclusion - fix macro names (s/SIL/SII) - drop unneeded hotplug_work field from struct sii902x - drop drm_connector_unregister() call in the ->destroy() method - add a timeout when polling a register value Changes in v6: - use HDMI_INFOFRAME_SIZE(AVI) - fix reset_gpio initialization - reduce the reset time based on Ming feedback Changes in v5: - drop the best_encoder() implementation Changes in v4: - make reset GPIO optional - only support attaching to DRM devices supporting atomic updates Changes in v3: - fix get_modes() implementation to avoid turning the screen in power save mode - rename the driver (sil902x -> sii902x) Changes in v2: - fix errors reported by the kbuild robot fixup! drm: bridge: Add sii902x driver
468 lines
13 KiB
C
468 lines
13 KiB
C
/*
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* Copyright (C) 2016 Atmel
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* Bo Shen <voice.shen@atmel.com>
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*
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* Authors: Bo Shen <voice.shen@atmel.com>
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* Boris Brezillon <boris.brezillon@free-electrons.com>
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* Wu, Songjun <Songjun.Wu@atmel.com>
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*
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*
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* Copyright (C) 2010-2011 Freescale Semiconductor, Inc. All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#include <linux/gpio/consumer.h>
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#include <linux/i2c.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <drm/drmP.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_crtc_helper.h>
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#include <drm/drm_edid.h>
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#define SII902X_TPI_VIDEO_DATA 0x0
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#define SII902X_TPI_PIXEL_REPETITION 0x8
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#define SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT BIT(5)
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#define SII902X_TPI_AVI_PIXEL_REP_RISING_EDGE BIT(4)
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#define SII902X_TPI_AVI_PIXEL_REP_4X 3
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#define SII902X_TPI_AVI_PIXEL_REP_2X 1
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#define SII902X_TPI_AVI_PIXEL_REP_NONE 0
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#define SII902X_TPI_CLK_RATIO_HALF (0 << 6)
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#define SII902X_TPI_CLK_RATIO_1X (1 << 6)
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#define SII902X_TPI_CLK_RATIO_2X (2 << 6)
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#define SII902X_TPI_CLK_RATIO_4X (3 << 6)
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#define SII902X_TPI_AVI_IN_FORMAT 0x9
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#define SII902X_TPI_AVI_INPUT_BITMODE_12BIT BIT(7)
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#define SII902X_TPI_AVI_INPUT_DITHER BIT(6)
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#define SII902X_TPI_AVI_INPUT_RANGE_LIMITED (2 << 2)
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#define SII902X_TPI_AVI_INPUT_RANGE_FULL (1 << 2)
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#define SII902X_TPI_AVI_INPUT_RANGE_AUTO (0 << 2)
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#define SII902X_TPI_AVI_INPUT_COLORSPACE_BLACK (3 << 0)
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#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV422 (2 << 0)
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#define SII902X_TPI_AVI_INPUT_COLORSPACE_YUV444 (1 << 0)
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#define SII902X_TPI_AVI_INPUT_COLORSPACE_RGB (0 << 0)
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#define SII902X_TPI_AVI_INFOFRAME 0x0c
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#define SII902X_SYS_CTRL_DATA 0x1a
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#define SII902X_SYS_CTRL_PWR_DWN BIT(4)
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#define SII902X_SYS_CTRL_AV_MUTE BIT(3)
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#define SII902X_SYS_CTRL_DDC_BUS_REQ BIT(2)
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#define SII902X_SYS_CTRL_DDC_BUS_GRTD BIT(1)
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#define SII902X_SYS_CTRL_OUTPUT_MODE BIT(0)
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#define SII902X_SYS_CTRL_OUTPUT_HDMI 1
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#define SII902X_SYS_CTRL_OUTPUT_DVI 0
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#define SII902X_REG_CHIPID(n) (0x1b + (n))
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#define SII902X_PWR_STATE_CTRL 0x1e
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#define SII902X_AVI_POWER_STATE_MSK GENMASK(1, 0)
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#define SII902X_AVI_POWER_STATE_D(l) ((l) & SII902X_AVI_POWER_STATE_MSK)
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#define SII902X_INT_ENABLE 0x3c
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#define SII902X_INT_STATUS 0x3d
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#define SII902X_HOTPLUG_EVENT BIT(0)
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#define SII902X_PLUGGED_STATUS BIT(2)
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#define SII902X_REG_TPI_RQB 0xc7
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#define SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS 500
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struct sii902x {
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struct i2c_client *i2c;
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struct regmap *regmap;
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struct drm_bridge bridge;
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struct drm_connector connector;
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struct gpio_desc *reset_gpio;
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};
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static inline struct sii902x *bridge_to_sii902x(struct drm_bridge *bridge)
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{
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return container_of(bridge, struct sii902x, bridge);
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}
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static inline struct sii902x *connector_to_sii902x(struct drm_connector *con)
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{
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return container_of(con, struct sii902x, connector);
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}
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static void sii902x_reset(struct sii902x *sii902x)
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{
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if (!sii902x->reset_gpio)
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return;
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gpiod_set_value(sii902x->reset_gpio, 1);
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/* The datasheet says treset-min = 100us. Make it 150us to be sure. */
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usleep_range(150, 200);
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gpiod_set_value(sii902x->reset_gpio, 0);
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}
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static enum drm_connector_status
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sii902x_connector_detect(struct drm_connector *connector, bool force)
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{
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struct sii902x *sii902x = connector_to_sii902x(connector);
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unsigned int status;
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regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
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return (status & SII902X_PLUGGED_STATUS) ?
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connector_status_connected : connector_status_disconnected;
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}
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static const struct drm_connector_funcs sii902x_connector_funcs = {
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.dpms = drm_atomic_helper_connector_dpms,
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.detect = sii902x_connector_detect,
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.fill_modes = drm_helper_probe_single_connector_modes,
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.destroy = drm_connector_cleanup,
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.reset = drm_atomic_helper_connector_reset,
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.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
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.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
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};
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static int sii902x_get_modes(struct drm_connector *connector)
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{
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struct sii902x *sii902x = connector_to_sii902x(connector);
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struct regmap *regmap = sii902x->regmap;
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u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
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unsigned long timeout;
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unsigned int status;
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struct edid *edid;
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int num = 0;
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int ret;
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ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
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SII902X_SYS_CTRL_DDC_BUS_REQ,
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SII902X_SYS_CTRL_DDC_BUS_REQ);
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if (ret)
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return ret;
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timeout = jiffies +
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msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
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do {
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ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
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if (ret)
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return ret;
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} while (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
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time_before(jiffies, timeout));
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if (!(status & SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
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dev_err(&sii902x->i2c->dev, "failed to acquire the i2c bus");
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return -ETIMEDOUT;
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}
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ret = regmap_write(regmap, SII902X_SYS_CTRL_DATA, status);
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if (ret)
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return ret;
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edid = drm_get_edid(connector, sii902x->i2c->adapter);
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drm_mode_connector_update_edid_property(connector, edid);
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if (edid) {
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num = drm_add_edid_modes(connector, edid);
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kfree(edid);
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}
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ret = drm_display_info_set_bus_formats(&connector->display_info,
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&bus_format, 1);
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if (ret)
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return ret;
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ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
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if (ret)
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return ret;
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ret = regmap_update_bits(regmap, SII902X_SYS_CTRL_DATA,
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SII902X_SYS_CTRL_DDC_BUS_REQ |
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SII902X_SYS_CTRL_DDC_BUS_GRTD, 0);
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if (ret)
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return ret;
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timeout = jiffies +
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msecs_to_jiffies(SII902X_I2C_BUS_ACQUISITION_TIMEOUT_MS);
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do {
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ret = regmap_read(regmap, SII902X_SYS_CTRL_DATA, &status);
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if (ret)
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return ret;
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} while (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
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SII902X_SYS_CTRL_DDC_BUS_GRTD) &&
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time_before(jiffies, timeout));
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if (status & (SII902X_SYS_CTRL_DDC_BUS_REQ |
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SII902X_SYS_CTRL_DDC_BUS_GRTD)) {
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dev_err(&sii902x->i2c->dev, "failed to release the i2c bus");
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return -ETIMEDOUT;
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}
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return num;
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}
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static enum drm_mode_status sii902x_mode_valid(struct drm_connector *connector,
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struct drm_display_mode *mode)
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{
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/* TODO: check mode */
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return MODE_OK;
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}
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static const struct drm_connector_helper_funcs sii902x_connector_helper_funcs = {
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.get_modes = sii902x_get_modes,
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.mode_valid = sii902x_mode_valid,
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};
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static void sii902x_bridge_disable(struct drm_bridge *bridge)
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{
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struct sii902x *sii902x = bridge_to_sii902x(bridge);
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regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
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SII902X_SYS_CTRL_PWR_DWN,
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SII902X_SYS_CTRL_PWR_DWN);
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}
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static void sii902x_bridge_enable(struct drm_bridge *bridge)
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{
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struct sii902x *sii902x = bridge_to_sii902x(bridge);
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regmap_update_bits(sii902x->regmap, SII902X_PWR_STATE_CTRL,
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SII902X_AVI_POWER_STATE_MSK,
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SII902X_AVI_POWER_STATE_D(0));
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regmap_update_bits(sii902x->regmap, SII902X_SYS_CTRL_DATA,
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SII902X_SYS_CTRL_PWR_DWN, 0);
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}
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static void sii902x_bridge_mode_set(struct drm_bridge *bridge,
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struct drm_display_mode *mode,
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struct drm_display_mode *adj)
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{
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struct sii902x *sii902x = bridge_to_sii902x(bridge);
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struct regmap *regmap = sii902x->regmap;
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u8 buf[HDMI_INFOFRAME_SIZE(AVI)];
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struct hdmi_avi_infoframe frame;
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int ret;
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buf[0] = adj->clock;
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buf[1] = adj->clock >> 8;
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buf[2] = adj->vrefresh;
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buf[3] = 0x00;
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buf[4] = adj->hdisplay;
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buf[5] = adj->hdisplay >> 8;
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buf[6] = adj->vdisplay;
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buf[7] = adj->vdisplay >> 8;
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buf[8] = SII902X_TPI_CLK_RATIO_1X | SII902X_TPI_AVI_PIXEL_REP_NONE |
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SII902X_TPI_AVI_PIXEL_REP_BUS_24BIT;
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buf[9] = SII902X_TPI_AVI_INPUT_RANGE_AUTO |
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SII902X_TPI_AVI_INPUT_COLORSPACE_RGB;
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ret = regmap_bulk_write(regmap, SII902X_TPI_VIDEO_DATA, buf, 10);
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if (ret)
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return;
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ret = drm_hdmi_avi_infoframe_from_display_mode(&frame, adj);
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if (ret < 0) {
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DRM_ERROR("couldn't fill AVI infoframe\n");
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return;
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}
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ret = hdmi_avi_infoframe_pack(&frame, buf, sizeof(buf));
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if (ret < 0) {
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DRM_ERROR("failed to pack AVI infoframe: %d\n", ret);
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return;
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}
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/* Do not send the infoframe header, but keep the CRC field. */
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regmap_bulk_write(regmap, SII902X_TPI_AVI_INFOFRAME,
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buf + HDMI_INFOFRAME_HEADER_SIZE - 1,
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HDMI_AVI_INFOFRAME_SIZE + 1);
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}
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static int sii902x_bridge_attach(struct drm_bridge *bridge)
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{
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struct sii902x *sii902x = bridge_to_sii902x(bridge);
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struct drm_device *drm = bridge->dev;
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int ret;
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drm_connector_helper_add(&sii902x->connector,
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&sii902x_connector_helper_funcs);
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if (!drm_core_check_feature(drm, DRIVER_ATOMIC)) {
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dev_err(&sii902x->i2c->dev,
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"sii902x driver is only compatible with DRM devices supporting atomic updates");
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return -ENOTSUPP;
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}
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ret = drm_connector_init(drm, &sii902x->connector,
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&sii902x_connector_funcs,
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DRM_MODE_CONNECTOR_HDMIA);
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if (ret)
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return ret;
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if (sii902x->i2c->irq > 0)
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sii902x->connector.polled = DRM_CONNECTOR_POLL_HPD;
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else
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sii902x->connector.polled = DRM_CONNECTOR_POLL_CONNECT;
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drm_mode_connector_attach_encoder(&sii902x->connector, bridge->encoder);
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return 0;
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}
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static const struct drm_bridge_funcs sii902x_bridge_funcs = {
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.attach = sii902x_bridge_attach,
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.mode_set = sii902x_bridge_mode_set,
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.disable = sii902x_bridge_disable,
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.enable = sii902x_bridge_enable,
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};
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static const struct regmap_range sii902x_volatile_ranges[] = {
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{ .range_min = 0, .range_max = 0xff },
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};
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static const struct regmap_access_table sii902x_volatile_table = {
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.yes_ranges = sii902x_volatile_ranges,
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.n_yes_ranges = ARRAY_SIZE(sii902x_volatile_ranges),
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};
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static const struct regmap_config sii902x_regmap_config = {
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.reg_bits = 8,
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.val_bits = 8,
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.volatile_table = &sii902x_volatile_table,
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.cache_type = REGCACHE_NONE,
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};
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static irqreturn_t sii902x_interrupt(int irq, void *data)
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{
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struct sii902x *sii902x = data;
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unsigned int status = 0;
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regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
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regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
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if ((status & SII902X_HOTPLUG_EVENT) && sii902x->bridge.dev)
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drm_helper_hpd_irq_event(sii902x->bridge.dev);
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return IRQ_HANDLED;
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}
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static int sii902x_probe(struct i2c_client *client,
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const struct i2c_device_id *id)
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{
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struct device *dev = &client->dev;
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unsigned int status = 0;
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struct sii902x *sii902x;
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u8 chipid[4];
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int ret;
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sii902x = devm_kzalloc(dev, sizeof(*sii902x), GFP_KERNEL);
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if (!sii902x)
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return -ENOMEM;
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sii902x->i2c = client;
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sii902x->regmap = devm_regmap_init_i2c(client, &sii902x_regmap_config);
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if (IS_ERR(sii902x->regmap))
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return PTR_ERR(sii902x->regmap);
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sii902x->reset_gpio = devm_gpiod_get_optional(dev, "reset",
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GPIOD_OUT_LOW);
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if (IS_ERR(sii902x->reset_gpio)) {
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dev_err(dev, "Failed to retrieve/request reset gpio: %ld\n",
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PTR_ERR(sii902x->reset_gpio));
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return PTR_ERR(sii902x->reset_gpio);
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}
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sii902x_reset(sii902x);
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ret = regmap_write(sii902x->regmap, SII902X_REG_TPI_RQB, 0x0);
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if (ret)
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return ret;
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ret = regmap_bulk_read(sii902x->regmap, SII902X_REG_CHIPID(0),
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&chipid, 4);
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if (ret) {
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dev_err(dev, "regmap_read failed %d\n", ret);
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return ret;
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}
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if (chipid[0] != 0xb0) {
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dev_err(dev, "Invalid chipid: %02x (expecting 0xb0)\n",
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chipid[0]);
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return -EINVAL;
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}
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/* Clear all pending interrupts */
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regmap_read(sii902x->regmap, SII902X_INT_STATUS, &status);
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regmap_write(sii902x->regmap, SII902X_INT_STATUS, status);
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if (client->irq > 0) {
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regmap_write(sii902x->regmap, SII902X_INT_ENABLE,
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SII902X_HOTPLUG_EVENT);
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ret = devm_request_threaded_irq(dev, client->irq, NULL,
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sii902x_interrupt,
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IRQF_ONESHOT, dev_name(dev),
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sii902x);
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if (ret)
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return ret;
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}
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sii902x->bridge.funcs = &sii902x_bridge_funcs;
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sii902x->bridge.of_node = dev->of_node;
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ret = drm_bridge_add(&sii902x->bridge);
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if (ret) {
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dev_err(dev, "Failed to add drm_bridge\n");
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return ret;
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}
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i2c_set_clientdata(client, sii902x);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int sii902x_remove(struct i2c_client *client)
|
|
|
|
{
|
|
struct sii902x *sii902x = i2c_get_clientdata(client);
|
|
|
|
drm_bridge_remove(&sii902x->bridge);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id sii902x_dt_ids[] = {
|
|
{ .compatible = "sil,sii9022", },
|
|
{ }
|
|
};
|
|
MODULE_DEVICE_TABLE(of, sii902x_dt_ids);
|
|
|
|
static const struct i2c_device_id sii902x_i2c_ids[] = {
|
|
{ "sii9022", 0 },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(i2c, sii902x_i2c_ids);
|
|
|
|
static struct i2c_driver sii902x_driver = {
|
|
.probe = sii902x_probe,
|
|
.remove = sii902x_remove,
|
|
.driver = {
|
|
.name = "sii902x",
|
|
.of_match_table = sii902x_dt_ids,
|
|
},
|
|
.id_table = sii902x_i2c_ids,
|
|
};
|
|
module_i2c_driver(sii902x_driver);
|
|
|
|
MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>");
|
|
MODULE_DESCRIPTION("SII902x RGB -> HDMI bridges");
|
|
MODULE_LICENSE("GPL");
|