mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-22 15:22:57 +07:00
9d5645ad1b
This protects device resources from use after device removal.
There are 3 ways for driver-device unbinding to happen:
- The driver module is unloaded causing the driver to be unregistered.
This can't happen as long as there are open file handles because a
reference is taken on the module.
- The device is removed (Device Tree overlay unloading).
This can happen at any time.
- The driver sysfs unbind file can be used to unbind the driver from the
device. This can happen any time.
v2: Since drm_atomic_helper_shutdown() has to be called after
drm_dev_unplug() we don't want do block ->disable after unplug.
Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190225144232.20761-8-noralf@tronnes.org
305 lines
6.5 KiB
C
305 lines
6.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
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/*
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* DRM driver for the HX8357D LCD controller
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*
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* Copyright 2018 Broadcom
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* Copyright 2018 David Lechner <david@lechnology.com>
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* Copyright 2016 Noralf Trønnes
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* Copyright (C) 2015 Adafruit Industries
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* Copyright (C) 2013 Christian Vogelgsang
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*/
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#include <linux/backlight.h>
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#include <linux/delay.h>
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#include <linux/gpio/consumer.h>
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#include <linux/module.h>
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#include <linux/property.h>
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#include <linux/spi/spi.h>
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#include <drm/drm_atomic_helper.h>
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#include <drm/drm_drv.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_gem_cma_helper.h>
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#include <drm/drm_gem_framebuffer_helper.h>
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#include <drm/drm_modeset_helper.h>
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#include <drm/tinydrm/mipi-dbi.h>
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#include <drm/tinydrm/tinydrm-helpers.h>
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#include <video/mipi_display.h>
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#define HX8357D_SETOSC 0xb0
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#define HX8357D_SETPOWER 0xb1
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#define HX8357D_SETRGB 0xb3
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#define HX8357D_SETCYC 0xb3
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#define HX8357D_SETCOM 0xb6
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#define HX8357D_SETEXTC 0xb9
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#define HX8357D_SETSTBA 0xc0
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#define HX8357D_SETPANEL 0xcc
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#define HX8357D_SETGAMMA 0xe0
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#define HX8357D_MADCTL_MY 0x80
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#define HX8357D_MADCTL_MX 0x40
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#define HX8357D_MADCTL_MV 0x20
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#define HX8357D_MADCTL_ML 0x10
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#define HX8357D_MADCTL_RGB 0x00
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#define HX8357D_MADCTL_BGR 0x08
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#define HX8357D_MADCTL_MH 0x04
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static void yx240qv29_enable(struct drm_simple_display_pipe *pipe,
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struct drm_crtc_state *crtc_state,
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struct drm_plane_state *plane_state)
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{
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struct mipi_dbi *mipi = drm_to_mipi_dbi(pipe->crtc.dev);
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u8 addr_mode;
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int ret, idx;
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if (!drm_dev_enter(pipe->crtc.dev, &idx))
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return;
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DRM_DEBUG_KMS("\n");
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ret = mipi_dbi_poweron_conditional_reset(mipi);
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if (ret < 0)
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goto out_exit;
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if (ret == 1)
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goto out_enable;
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/* setextc */
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mipi_dbi_command(mipi, HX8357D_SETEXTC, 0xFF, 0x83, 0x57);
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msleep(150);
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/* setRGB which also enables SDO */
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mipi_dbi_command(mipi, HX8357D_SETRGB, 0x00, 0x00, 0x06, 0x06);
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/* -1.52V */
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mipi_dbi_command(mipi, HX8357D_SETCOM, 0x25);
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/* Normal mode 70Hz, Idle mode 55 Hz */
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mipi_dbi_command(mipi, HX8357D_SETOSC, 0x68);
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/* Set Panel - BGR, Gate direction swapped */
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mipi_dbi_command(mipi, HX8357D_SETPANEL, 0x05);
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mipi_dbi_command(mipi, HX8357D_SETPOWER,
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0x00, /* Not deep standby */
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0x15, /* BT */
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0x1C, /* VSPR */
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0x1C, /* VSNR */
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0x83, /* AP */
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0xAA); /* FS */
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mipi_dbi_command(mipi, HX8357D_SETSTBA,
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0x50, /* OPON normal */
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0x50, /* OPON idle */
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0x01, /* STBA */
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0x3C, /* STBA */
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0x1E, /* STBA */
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0x08); /* GEN */
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mipi_dbi_command(mipi, HX8357D_SETCYC,
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0x02, /* NW 0x02 */
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0x40, /* RTN */
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0x00, /* DIV */
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0x2A, /* DUM */
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0x2A, /* DUM */
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0x0D, /* GDON */
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0x78); /* GDOFF */
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mipi_dbi_command(mipi, HX8357D_SETGAMMA,
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0x02,
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0x0A,
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0x11,
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0x1d,
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0x23,
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0x35,
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0x41,
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0x4b,
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0x4b,
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0x42,
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0x3A,
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0x27,
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0x1B,
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0x08,
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0x09,
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0x03,
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0x02,
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0x0A,
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0x11,
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0x1d,
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0x23,
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0x35,
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0x41,
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0x4b,
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0x4b,
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0x42,
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0x3A,
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0x27,
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0x1B,
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0x08,
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0x09,
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0x03,
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0x00,
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0x01);
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/* 16 bit */
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mipi_dbi_command(mipi, MIPI_DCS_SET_PIXEL_FORMAT,
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MIPI_DCS_PIXEL_FMT_16BIT);
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/* TE off */
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mipi_dbi_command(mipi, MIPI_DCS_SET_TEAR_ON, 0x00);
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/* tear line */
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mipi_dbi_command(mipi, MIPI_DCS_SET_TEAR_SCANLINE, 0x00, 0x02);
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/* Exit Sleep */
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mipi_dbi_command(mipi, MIPI_DCS_EXIT_SLEEP_MODE);
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msleep(150);
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/* display on */
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mipi_dbi_command(mipi, MIPI_DCS_SET_DISPLAY_ON);
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usleep_range(5000, 7000);
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out_enable:
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switch (mipi->rotation) {
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default:
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addr_mode = HX8357D_MADCTL_MX | HX8357D_MADCTL_MY;
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break;
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case 90:
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addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MY;
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break;
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case 180:
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addr_mode = 0;
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break;
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case 270:
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addr_mode = HX8357D_MADCTL_MV | HX8357D_MADCTL_MX;
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break;
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}
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mipi_dbi_command(mipi, MIPI_DCS_SET_ADDRESS_MODE, addr_mode);
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mipi_dbi_enable_flush(mipi, crtc_state, plane_state);
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out_exit:
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drm_dev_exit(idx);
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}
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static const struct drm_simple_display_pipe_funcs hx8357d_pipe_funcs = {
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.enable = yx240qv29_enable,
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.disable = mipi_dbi_pipe_disable,
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.update = mipi_dbi_pipe_update,
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.prepare_fb = drm_gem_fb_simple_display_pipe_prepare_fb,
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};
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static const struct drm_display_mode yx350hv15_mode = {
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DRM_SIMPLE_MODE(320, 480, 60, 75),
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};
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DEFINE_DRM_GEM_CMA_FOPS(hx8357d_fops);
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static struct drm_driver hx8357d_driver = {
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.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_PRIME | DRIVER_ATOMIC,
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.fops = &hx8357d_fops,
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.release = mipi_dbi_release,
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DRM_GEM_CMA_VMAP_DRIVER_OPS,
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.debugfs_init = mipi_dbi_debugfs_init,
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.name = "hx8357d",
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.desc = "HX8357D",
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.date = "20181023",
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.major = 1,
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.minor = 0,
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};
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static const struct of_device_id hx8357d_of_match[] = {
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{ .compatible = "adafruit,yx350hv15" },
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{ }
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};
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MODULE_DEVICE_TABLE(of, hx8357d_of_match);
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static const struct spi_device_id hx8357d_id[] = {
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{ "yx350hv15", 0 },
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{ }
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};
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MODULE_DEVICE_TABLE(spi, hx8357d_id);
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static int hx8357d_probe(struct spi_device *spi)
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{
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struct device *dev = &spi->dev;
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struct drm_device *drm;
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struct mipi_dbi *mipi;
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struct gpio_desc *dc;
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u32 rotation = 0;
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int ret;
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mipi = kzalloc(sizeof(*mipi), GFP_KERNEL);
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if (!mipi)
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return -ENOMEM;
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drm = &mipi->drm;
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ret = devm_drm_dev_init(dev, drm, &hx8357d_driver);
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if (ret) {
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kfree(mipi);
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return ret;
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}
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drm_mode_config_init(drm);
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dc = devm_gpiod_get(dev, "dc", GPIOD_OUT_LOW);
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if (IS_ERR(dc)) {
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DRM_DEV_ERROR(dev, "Failed to get gpio 'dc'\n");
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return PTR_ERR(dc);
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}
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mipi->backlight = devm_of_find_backlight(dev);
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if (IS_ERR(mipi->backlight))
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return PTR_ERR(mipi->backlight);
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device_property_read_u32(dev, "rotation", &rotation);
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ret = mipi_dbi_spi_init(spi, mipi, dc);
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if (ret)
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return ret;
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ret = mipi_dbi_init(mipi, &hx8357d_pipe_funcs, &yx350hv15_mode, rotation);
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if (ret)
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return ret;
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drm_mode_config_reset(drm);
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ret = drm_dev_register(drm, 0);
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if (ret)
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return ret;
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spi_set_drvdata(spi, drm);
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drm_fbdev_generic_setup(drm, 32);
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return 0;
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}
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static int hx8357d_remove(struct spi_device *spi)
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{
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struct drm_device *drm = spi_get_drvdata(spi);
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drm_dev_unplug(drm);
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drm_atomic_helper_shutdown(drm);
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return 0;
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}
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static void hx8357d_shutdown(struct spi_device *spi)
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{
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drm_atomic_helper_shutdown(spi_get_drvdata(spi));
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}
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static struct spi_driver hx8357d_spi_driver = {
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.driver = {
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.name = "hx8357d",
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.of_match_table = hx8357d_of_match,
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},
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.id_table = hx8357d_id,
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.probe = hx8357d_probe,
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.remove = hx8357d_remove,
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.shutdown = hx8357d_shutdown,
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};
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module_spi_driver(hx8357d_spi_driver);
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MODULE_DESCRIPTION("HX8357D DRM driver");
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MODULE_AUTHOR("Eric Anholt <eric@anholt.net>");
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MODULE_LICENSE("GPL");
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