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linux_dsm_epyc7002/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
Maxime Ripard 1c7c62a37a
drm/sun4i: dsi: Fix unitialized variable warning 
Since the DPHY rework, one error path doesn't set the return error code
before jumping to its error label, which in turns make gcc (rightfully)
complain about the variable holding the error code being uninitialized.

Fix this.

Fixes: bb3b6fcb68 ("sun6i: dsi: Convert to generic phy handling")
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190208090540.19626-1-maxime.ripard@bootlin.com
2019-02-08 10:28:11 +01:00

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// SPDX-License-Identifier: GPL-2.0+
/*
* Copyright (c) 2016 Allwinnertech Co., Ltd.
* Copyright (C) 2017-2018 Bootlin
*
* Maxime Ripard <maxime.ripard@bootlin.com>
*/
#include <linux/clk.h>
#include <linux/component.h>
#include <linux/crc-ccitt.h>
#include <linux/of_address.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/slab.h>
#include <linux/phy/phy.h>
#include <linux/phy/phy-mipi-dphy.h>
#include <drm/drmP.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_panel.h>
#include <drm/drm_probe_helper.h>
#include "sun4i_drv.h"
#include "sun6i_mipi_dsi.h"
#include <video/mipi_display.h>
#define SUN6I_DSI_CTL_REG 0x000
#define SUN6I_DSI_CTL_EN BIT(0)
#define SUN6I_DSI_BASIC_CTL_REG 0x00c
#define SUN6I_DSI_BASIC_CTL_HBP_DIS BIT(2)
#define SUN6I_DSI_BASIC_CTL_HSA_HSE_DIS BIT(1)
#define SUN6I_DSI_BASIC_CTL_VIDEO_BURST BIT(0)
#define SUN6I_DSI_BASIC_CTL0_REG 0x010
#define SUN6I_DSI_BASIC_CTL0_HS_EOTP_EN BIT(18)
#define SUN6I_DSI_BASIC_CTL0_CRC_EN BIT(17)
#define SUN6I_DSI_BASIC_CTL0_ECC_EN BIT(16)
#define SUN6I_DSI_BASIC_CTL0_INST_ST BIT(0)
#define SUN6I_DSI_BASIC_CTL1_REG 0x014
#define SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(n) (((n) & 0x1fff) << 4)
#define SUN6I_DSI_BASIC_CTL1_VIDEO_FILL BIT(2)
#define SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION BIT(1)
#define SUN6I_DSI_BASIC_CTL1_VIDEO_MODE BIT(0)
#define SUN6I_DSI_BASIC_SIZE0_REG 0x018
#define SUN6I_DSI_BASIC_SIZE0_VBP(n) (((n) & 0xfff) << 16)
#define SUN6I_DSI_BASIC_SIZE0_VSA(n) ((n) & 0xfff)
#define SUN6I_DSI_BASIC_SIZE1_REG 0x01c
#define SUN6I_DSI_BASIC_SIZE1_VT(n) (((n) & 0xfff) << 16)
#define SUN6I_DSI_BASIC_SIZE1_VACT(n) ((n) & 0xfff)
#define SUN6I_DSI_INST_FUNC_REG(n) (0x020 + (n) * 0x04)
#define SUN6I_DSI_INST_FUNC_INST_MODE(n) (((n) & 0xf) << 28)
#define SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(n) (((n) & 0xf) << 24)
#define SUN6I_DSI_INST_FUNC_TRANS_PACKET(n) (((n) & 0xf) << 20)
#define SUN6I_DSI_INST_FUNC_LANE_CEN BIT(4)
#define SUN6I_DSI_INST_FUNC_LANE_DEN(n) ((n) & 0xf)
#define SUN6I_DSI_INST_LOOP_SEL_REG 0x040
#define SUN6I_DSI_INST_LOOP_NUM_REG(n) (0x044 + (n) * 0x10)
#define SUN6I_DSI_INST_LOOP_NUM_N1(n) (((n) & 0xfff) << 16)
#define SUN6I_DSI_INST_LOOP_NUM_N0(n) ((n) & 0xfff)
#define SUN6I_DSI_INST_JUMP_SEL_REG 0x048
#define SUN6I_DSI_INST_JUMP_CFG_REG(n) (0x04c + (n) * 0x04)
#define SUN6I_DSI_INST_JUMP_CFG_TO(n) (((n) & 0xf) << 20)
#define SUN6I_DSI_INST_JUMP_CFG_POINT(n) (((n) & 0xf) << 16)
#define SUN6I_DSI_INST_JUMP_CFG_NUM(n) ((n) & 0xffff)
#define SUN6I_DSI_TRANS_START_REG 0x060
#define SUN6I_DSI_TRANS_ZERO_REG 0x078
#define SUN6I_DSI_TCON_DRQ_REG 0x07c
#define SUN6I_DSI_TCON_DRQ_ENABLE_MODE BIT(28)
#define SUN6I_DSI_TCON_DRQ_SET(n) ((n) & 0x3ff)
#define SUN6I_DSI_PIXEL_CTL0_REG 0x080
#define SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE BIT(16)
#define SUN6I_DSI_PIXEL_CTL0_FORMAT(n) ((n) & 0xf)
#define SUN6I_DSI_PIXEL_CTL1_REG 0x084
#define SUN6I_DSI_PIXEL_PH_REG 0x090
#define SUN6I_DSI_PIXEL_PH_ECC(n) (((n) & 0xff) << 24)
#define SUN6I_DSI_PIXEL_PH_WC(n) (((n) & 0xffff) << 8)
#define SUN6I_DSI_PIXEL_PH_VC(n) (((n) & 3) << 6)
#define SUN6I_DSI_PIXEL_PH_DT(n) ((n) & 0x3f)
#define SUN6I_DSI_PIXEL_PF0_REG 0x098
#define SUN6I_DSI_PIXEL_PF0_CRC_FORCE(n) ((n) & 0xffff)
#define SUN6I_DSI_PIXEL_PF1_REG 0x09c
#define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(n) ((n) & 0xffff)
#define SUN6I_DSI_SYNC_HSS_REG 0x0b0
#define SUN6I_DSI_SYNC_HSE_REG 0x0b4
#define SUN6I_DSI_SYNC_VSS_REG 0x0b8
#define SUN6I_DSI_SYNC_VSE_REG 0x0bc
#define SUN6I_DSI_BLK_HSA0_REG 0x0c0
#define SUN6I_DSI_BLK_HSA1_REG 0x0c4
#define SUN6I_DSI_BLK_PF(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_BLK_PD(n) ((n) & 0xff)
#define SUN6I_DSI_BLK_HBP0_REG 0x0c8
#define SUN6I_DSI_BLK_HBP1_REG 0x0cc
#define SUN6I_DSI_BLK_HFP0_REG 0x0d0
#define SUN6I_DSI_BLK_HFP1_REG 0x0d4
#define SUN6I_DSI_BLK_HBLK0_REG 0x0e0
#define SUN6I_DSI_BLK_HBLK1_REG 0x0e4
#define SUN6I_DSI_BLK_VBLK0_REG 0x0e8
#define SUN6I_DSI_BLK_VBLK1_REG 0x0ec
#define SUN6I_DSI_BURST_LINE_REG 0x0f0
#define SUN6I_DSI_BURST_LINE_SYNC_POINT(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_BURST_LINE_NUM(n) ((n) & 0xffff)
#define SUN6I_DSI_BURST_DRQ_REG 0x0f4
#define SUN6I_DSI_BURST_DRQ_EDGE1(n) (((n) & 0xffff) << 16)
#define SUN6I_DSI_BURST_DRQ_EDGE0(n) ((n) & 0xffff)
#define SUN6I_DSI_CMD_CTL_REG 0x200
#define SUN6I_DSI_CMD_CTL_RX_OVERFLOW BIT(26)
#define SUN6I_DSI_CMD_CTL_RX_FLAG BIT(25)
#define SUN6I_DSI_CMD_CTL_TX_FLAG BIT(9)
#define SUN6I_DSI_CMD_RX_REG(n) (0x240 + (n) * 0x04)
#define SUN6I_DSI_DEBUG_DATA_REG 0x2f8
#define SUN6I_DSI_CMD_TX_REG(n) (0x300 + (n) * 0x04)
enum sun6i_dsi_start_inst {
DSI_START_LPRX,
DSI_START_LPTX,
DSI_START_HSC,
DSI_START_HSD,
};
enum sun6i_dsi_inst_id {
DSI_INST_ID_LP11 = 0,
DSI_INST_ID_TBA,
DSI_INST_ID_HSC,
DSI_INST_ID_HSD,
DSI_INST_ID_LPDT,
DSI_INST_ID_HSCEXIT,
DSI_INST_ID_NOP,
DSI_INST_ID_DLY,
DSI_INST_ID_END = 15,
};
enum sun6i_dsi_inst_mode {
DSI_INST_MODE_STOP = 0,
DSI_INST_MODE_TBA,
DSI_INST_MODE_HS,
DSI_INST_MODE_ESCAPE,
DSI_INST_MODE_HSCEXIT,
DSI_INST_MODE_NOP,
};
enum sun6i_dsi_inst_escape {
DSI_INST_ESCA_LPDT = 0,
DSI_INST_ESCA_ULPS,
DSI_INST_ESCA_UN1,
DSI_INST_ESCA_UN2,
DSI_INST_ESCA_RESET,
DSI_INST_ESCA_UN3,
DSI_INST_ESCA_UN4,
DSI_INST_ESCA_UN5,
};
enum sun6i_dsi_inst_packet {
DSI_INST_PACK_PIXEL = 0,
DSI_INST_PACK_COMMAND,
};
static const u32 sun6i_dsi_ecc_array[] = {
[0] = (BIT(0) | BIT(1) | BIT(2) | BIT(4) | BIT(5) | BIT(7) | BIT(10) |
BIT(11) | BIT(13) | BIT(16) | BIT(20) | BIT(21) | BIT(22) |
BIT(23)),
[1] = (BIT(0) | BIT(1) | BIT(3) | BIT(4) | BIT(6) | BIT(8) | BIT(10) |
BIT(12) | BIT(14) | BIT(17) | BIT(20) | BIT(21) | BIT(22) |
BIT(23)),
[2] = (BIT(0) | BIT(2) | BIT(3) | BIT(5) | BIT(6) | BIT(9) | BIT(11) |
BIT(12) | BIT(15) | BIT(18) | BIT(20) | BIT(21) | BIT(22)),
[3] = (BIT(1) | BIT(2) | BIT(3) | BIT(7) | BIT(8) | BIT(9) | BIT(13) |
BIT(14) | BIT(15) | BIT(19) | BIT(20) | BIT(21) | BIT(23)),
[4] = (BIT(4) | BIT(5) | BIT(6) | BIT(7) | BIT(8) | BIT(9) | BIT(16) |
BIT(17) | BIT(18) | BIT(19) | BIT(20) | BIT(22) | BIT(23)),
[5] = (BIT(10) | BIT(11) | BIT(12) | BIT(13) | BIT(14) | BIT(15) |
BIT(16) | BIT(17) | BIT(18) | BIT(19) | BIT(21) | BIT(22) |
BIT(23)),
};
static u32 sun6i_dsi_ecc_compute(unsigned int data)
{
int i;
u8 ecc = 0;
for (i = 0; i < ARRAY_SIZE(sun6i_dsi_ecc_array); i++) {
u32 field = sun6i_dsi_ecc_array[i];
bool init = false;
u8 val = 0;
int j;
for (j = 0; j < 24; j++) {
if (!(BIT(j) & field))
continue;
if (!init) {
val = (BIT(j) & data) ? 1 : 0;
init = true;
} else {
val ^= (BIT(j) & data) ? 1 : 0;
}
}
ecc |= val << i;
}
return ecc;
}
static u16 sun6i_dsi_crc_compute(u8 const *buffer, size_t len)
{
return crc_ccitt(0xffff, buffer, len);
}
static u16 sun6i_dsi_crc_repeat(u8 pd, u8 *buffer, size_t len)
{
memset(buffer, pd, len);
return sun6i_dsi_crc_compute(buffer, len);
}
static u32 sun6i_dsi_build_sync_pkt(u8 dt, u8 vc, u8 d0, u8 d1)
{
u32 val = dt & 0x3f;
val |= (vc & 3) << 6;
val |= (d0 & 0xff) << 8;
val |= (d1 & 0xff) << 16;
val |= sun6i_dsi_ecc_compute(val) << 24;
return val;
}
static u32 sun6i_dsi_build_blk0_pkt(u8 vc, u16 wc)
{
return sun6i_dsi_build_sync_pkt(MIPI_DSI_BLANKING_PACKET, vc,
wc & 0xff, wc >> 8);
}
static u32 sun6i_dsi_build_blk1_pkt(u16 pd, u8 *buffer, size_t len)
{
u32 val = SUN6I_DSI_BLK_PD(pd);
return val | SUN6I_DSI_BLK_PF(sun6i_dsi_crc_repeat(pd, buffer, len));
}
static void sun6i_dsi_inst_abort(struct sun6i_dsi *dsi)
{
regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
SUN6I_DSI_BASIC_CTL0_INST_ST, 0);
}
static void sun6i_dsi_inst_commit(struct sun6i_dsi *dsi)
{
regmap_update_bits(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
SUN6I_DSI_BASIC_CTL0_INST_ST,
SUN6I_DSI_BASIC_CTL0_INST_ST);
}
static int sun6i_dsi_inst_wait_for_completion(struct sun6i_dsi *dsi)
{
u32 val;
return regmap_read_poll_timeout(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
val,
!(val & SUN6I_DSI_BASIC_CTL0_INST_ST),
100, 5000);
}
static void sun6i_dsi_inst_setup(struct sun6i_dsi *dsi,
enum sun6i_dsi_inst_id id,
enum sun6i_dsi_inst_mode mode,
bool clock, u8 data,
enum sun6i_dsi_inst_packet packet,
enum sun6i_dsi_inst_escape escape)
{
regmap_write(dsi->regs, SUN6I_DSI_INST_FUNC_REG(id),
SUN6I_DSI_INST_FUNC_INST_MODE(mode) |
SUN6I_DSI_INST_FUNC_ESCAPE_ENTRY(escape) |
SUN6I_DSI_INST_FUNC_TRANS_PACKET(packet) |
(clock ? SUN6I_DSI_INST_FUNC_LANE_CEN : 0) |
SUN6I_DSI_INST_FUNC_LANE_DEN(data));
}
static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi,
struct mipi_dsi_device *device)
{
u8 lanes_mask = GENMASK(device->lanes - 1, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LP11, DSI_INST_MODE_STOP,
true, lanes_mask, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_TBA, DSI_INST_MODE_TBA,
false, 1, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSC, DSI_INST_MODE_HS,
true, 0, DSI_INST_PACK_PIXEL, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSD, DSI_INST_MODE_HS,
false, lanes_mask, DSI_INST_PACK_PIXEL, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_LPDT, DSI_INST_MODE_ESCAPE,
false, 1, DSI_INST_PACK_COMMAND,
DSI_INST_ESCA_LPDT);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_HSCEXIT, DSI_INST_MODE_HSCEXIT,
true, 0, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_NOP, DSI_INST_MODE_STOP,
false, lanes_mask, 0, 0);
sun6i_dsi_inst_setup(dsi, DSI_INST_ID_DLY, DSI_INST_MODE_NOP,
true, lanes_mask, 0, 0);
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_CFG_REG(0),
SUN6I_DSI_INST_JUMP_CFG_POINT(DSI_INST_ID_NOP) |
SUN6I_DSI_INST_JUMP_CFG_TO(DSI_INST_ID_HSCEXIT) |
SUN6I_DSI_INST_JUMP_CFG_NUM(1));
};
static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
return mode->vtotal - (mode->vsync_end - mode->vdisplay) + 1;
}
static void sun6i_dsi_setup_burst(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
struct mipi_dsi_device *device = dsi->device;
u32 val = 0;
if ((mode->hsync_end - mode->hdisplay) > 20) {
/* Maaaaaagic */
u16 drq = (mode->hsync_end - mode->hdisplay) - 20;
drq *= mipi_dsi_pixel_format_to_bpp(device->format);
drq /= 32;
val = (SUN6I_DSI_TCON_DRQ_ENABLE_MODE |
SUN6I_DSI_TCON_DRQ_SET(drq));
}
regmap_write(dsi->regs, SUN6I_DSI_TCON_DRQ_REG, val);
}
static void sun6i_dsi_setup_inst_loop(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
u16 delay = 50 - 1;
regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(0),
SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
SUN6I_DSI_INST_LOOP_NUM_N1(delay));
regmap_write(dsi->regs, SUN6I_DSI_INST_LOOP_NUM_REG(1),
SUN6I_DSI_INST_LOOP_NUM_N0(50 - 1) |
SUN6I_DSI_INST_LOOP_NUM_N1(delay));
}
static void sun6i_dsi_setup_format(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
struct mipi_dsi_device *device = dsi->device;
u32 val = SUN6I_DSI_PIXEL_PH_VC(device->channel);
u8 dt, fmt;
u16 wc;
/*
* TODO: The format defines are only valid in video mode and
* change in command mode.
*/
switch (device->format) {
case MIPI_DSI_FMT_RGB888:
dt = MIPI_DSI_PACKED_PIXEL_STREAM_24;
fmt = 8;
break;
case MIPI_DSI_FMT_RGB666:
dt = MIPI_DSI_PIXEL_STREAM_3BYTE_18;
fmt = 9;
break;
case MIPI_DSI_FMT_RGB666_PACKED:
dt = MIPI_DSI_PACKED_PIXEL_STREAM_18;
fmt = 10;
break;
case MIPI_DSI_FMT_RGB565:
dt = MIPI_DSI_PACKED_PIXEL_STREAM_16;
fmt = 11;
break;
default:
return;
}
val |= SUN6I_DSI_PIXEL_PH_DT(dt);
wc = mode->hdisplay * mipi_dsi_pixel_format_to_bpp(device->format) / 8;
val |= SUN6I_DSI_PIXEL_PH_WC(wc);
val |= SUN6I_DSI_PIXEL_PH_ECC(sun6i_dsi_ecc_compute(val));
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PH_REG, val);
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF0_REG,
SUN6I_DSI_PIXEL_PF0_CRC_FORCE(0xffff));
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_PF1_REG,
SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINE0(0xffff) |
SUN6I_DSI_PIXEL_PF1_CRC_INIT_LINEN(0xffff));
regmap_write(dsi->regs, SUN6I_DSI_PIXEL_CTL0_REG,
SUN6I_DSI_PIXEL_CTL0_PD_PLUG_DISABLE |
SUN6I_DSI_PIXEL_CTL0_FORMAT(fmt));
}
static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
struct drm_display_mode *mode)
{
struct mipi_dsi_device *device = dsi->device;
unsigned int Bpp = mipi_dsi_pixel_format_to_bpp(device->format) / 8;
u16 hbp, hfp, hsa, hblk, vblk;
size_t bytes;
u8 *buffer;
/* Do all timing calculations up front to allocate buffer space */
/*
* A sync period is composed of a blanking packet (4 bytes +
* payload + 2 bytes) and a sync event packet (4 bytes). Its
* minimal size is therefore 10 bytes
*/
#define HSA_PACKET_OVERHEAD 10
hsa = max((unsigned int)HSA_PACKET_OVERHEAD,
(mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
/*
* The backporch is set using a blanking packet (4 bytes +
* payload + 2 bytes). Its minimal size is therefore 6 bytes
*/
#define HBP_PACKET_OVERHEAD 6
hbp = max((unsigned int)HBP_PACKET_OVERHEAD,
(mode->hsync_start - mode->hdisplay) * Bpp - HBP_PACKET_OVERHEAD);
/*
* The frontporch is set using a blanking packet (4 bytes +
* payload + 2 bytes). Its minimal size is therefore 6 bytes
*/
#define HFP_PACKET_OVERHEAD 6
hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
(mode->htotal - mode->hsync_end) * Bpp - HFP_PACKET_OVERHEAD);
/*
* hblk seems to be the line + porches length.
*/
hblk = mode->htotal * Bpp - hsa;
/*
* And I'm not entirely sure what vblk is about. The driver in
* Allwinner BSP is using a rather convoluted calculation
* there only for 4 lanes. However, using 0 (the !4 lanes
* case) even with a 4 lanes screen seems to work...
*/
vblk = 0;
/* How many bytes do we need to send all payloads? */
bytes = max_t(size_t, max(max(hfp, hblk), max(hsa, hbp)), vblk);
buffer = kmalloc(bytes, GFP_KERNEL);
if (WARN_ON(!buffer))
return;
regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL_REG, 0);
regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSS_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_START,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_SYNC_HSE_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_H_SYNC_END,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSS_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_START,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_SYNC_VSE_REG,
sun6i_dsi_build_sync_pkt(MIPI_DSI_V_SYNC_END,
device->channel,
0, 0));
regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE0_REG,
SUN6I_DSI_BASIC_SIZE0_VSA(mode->vsync_end -
mode->vsync_start) |
SUN6I_DSI_BASIC_SIZE0_VBP(mode->vsync_start -
mode->vdisplay));
regmap_write(dsi->regs, SUN6I_DSI_BASIC_SIZE1_REG,
SUN6I_DSI_BASIC_SIZE1_VACT(mode->vdisplay) |
SUN6I_DSI_BASIC_SIZE1_VT(mode->vtotal));
/* sync */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hsa));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HSA1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hsa));
/* backporch */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hbp));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBP1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hbp));
/* frontporch */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hfp));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HFP1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hfp));
/* hblk */
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, hblk));
regmap_write(dsi->regs, SUN6I_DSI_BLK_HBLK1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, hblk));
/* vblk */
regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK0_REG,
sun6i_dsi_build_blk0_pkt(device->channel, vblk));
regmap_write(dsi->regs, SUN6I_DSI_BLK_VBLK1_REG,
sun6i_dsi_build_blk1_pkt(0, buffer, vblk));
kfree(buffer);
}
static int sun6i_dsi_start(struct sun6i_dsi *dsi,
enum sun6i_dsi_start_inst func)
{
switch (func) {
case DSI_START_LPTX:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_END << (4 * DSI_INST_ID_LPDT));
break;
case DSI_START_LPRX:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_LPDT << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_DLY << (4 * DSI_INST_ID_LPDT) |
DSI_INST_ID_TBA << (4 * DSI_INST_ID_DLY) |
DSI_INST_ID_END << (4 * DSI_INST_ID_TBA));
break;
case DSI_START_HSC:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_HSC << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_END << (4 * DSI_INST_ID_HSC));
break;
case DSI_START_HSD:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_NOP << (4 * DSI_INST_ID_LP11) |
DSI_INST_ID_HSD << (4 * DSI_INST_ID_NOP) |
DSI_INST_ID_DLY << (4 * DSI_INST_ID_HSD) |
DSI_INST_ID_NOP << (4 * DSI_INST_ID_DLY) |
DSI_INST_ID_END << (4 * DSI_INST_ID_HSCEXIT));
break;
default:
regmap_write(dsi->regs, SUN6I_DSI_INST_JUMP_SEL_REG,
DSI_INST_ID_END << (4 * DSI_INST_ID_LP11));
break;
}
sun6i_dsi_inst_abort(dsi);
sun6i_dsi_inst_commit(dsi);
if (func == DSI_START_HSC)
regmap_write_bits(dsi->regs,
SUN6I_DSI_INST_FUNC_REG(DSI_INST_ID_LP11),
SUN6I_DSI_INST_FUNC_LANE_CEN, 0);
return 0;
}
static void sun6i_dsi_encoder_enable(struct drm_encoder *encoder)
{
struct drm_display_mode *mode = &encoder->crtc->state->adjusted_mode;
struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
struct mipi_dsi_device *device = dsi->device;
union phy_configure_opts opts = { 0 };
struct phy_configure_opts_mipi_dphy *cfg = &opts.mipi_dphy;
u16 delay;
DRM_DEBUG_DRIVER("Enabling DSI output\n");
pm_runtime_get_sync(dsi->dev);
delay = sun6i_dsi_get_video_start_delay(dsi, mode);
regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL1_REG,
SUN6I_DSI_BASIC_CTL1_VIDEO_ST_DELAY(delay) |
SUN6I_DSI_BASIC_CTL1_VIDEO_FILL |
SUN6I_DSI_BASIC_CTL1_VIDEO_PRECISION |
SUN6I_DSI_BASIC_CTL1_VIDEO_MODE);
sun6i_dsi_setup_burst(dsi, mode);
sun6i_dsi_setup_inst_loop(dsi, mode);
sun6i_dsi_setup_format(dsi, mode);
sun6i_dsi_setup_timings(dsi, mode);
phy_init(dsi->dphy);
phy_mipi_dphy_get_default_config(mode->clock * 1000,
mipi_dsi_pixel_format_to_bpp(device->format),
device->lanes, cfg);
phy_set_mode(dsi->dphy, PHY_MODE_MIPI_DPHY);
phy_configure(dsi->dphy, &opts);
phy_power_on(dsi->dphy);
if (!IS_ERR(dsi->panel))
drm_panel_prepare(dsi->panel);
/*
* FIXME: This should be moved after the switch to HS mode.
*
* Unfortunately, once in HS mode, it seems like we're not
* able to send DCS commands anymore, which would prevent any
* panel to send any DCS command as part as their enable
* method, which is quite common.
*
* I haven't seen any artifact due to that sub-optimal
* ordering on the panels I've tested it with, so I guess this
* will do for now, until that IP is better understood.
*/
if (!IS_ERR(dsi->panel))
drm_panel_enable(dsi->panel);
sun6i_dsi_start(dsi, DSI_START_HSC);
udelay(1000);
sun6i_dsi_start(dsi, DSI_START_HSD);
}
static void sun6i_dsi_encoder_disable(struct drm_encoder *encoder)
{
struct sun6i_dsi *dsi = encoder_to_sun6i_dsi(encoder);
DRM_DEBUG_DRIVER("Disabling DSI output\n");
if (!IS_ERR(dsi->panel)) {
drm_panel_disable(dsi->panel);
drm_panel_unprepare(dsi->panel);
}
phy_power_off(dsi->dphy);
phy_exit(dsi->dphy);
pm_runtime_put(dsi->dev);
}
static int sun6i_dsi_get_modes(struct drm_connector *connector)
{
struct sun6i_dsi *dsi = connector_to_sun6i_dsi(connector);
return drm_panel_get_modes(dsi->panel);
}
static struct drm_connector_helper_funcs sun6i_dsi_connector_helper_funcs = {
.get_modes = sun6i_dsi_get_modes,
};
static enum drm_connector_status
sun6i_dsi_connector_detect(struct drm_connector *connector, bool force)
{
return connector_status_connected;
}
static const struct drm_connector_funcs sun6i_dsi_connector_funcs = {
.detect = sun6i_dsi_connector_detect,
.fill_modes = drm_helper_probe_single_connector_modes,
.destroy = drm_connector_cleanup,
.reset = drm_atomic_helper_connector_reset,
.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
};
static const struct drm_encoder_helper_funcs sun6i_dsi_enc_helper_funcs = {
.disable = sun6i_dsi_encoder_disable,
.enable = sun6i_dsi_encoder_enable,
};
static const struct drm_encoder_funcs sun6i_dsi_enc_funcs = {
.destroy = drm_encoder_cleanup,
};
static u32 sun6i_dsi_dcs_build_pkt_hdr(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
u32 pkt = msg->type;
if (msg->type == MIPI_DSI_DCS_LONG_WRITE) {
pkt |= ((msg->tx_len + 1) & 0xffff) << 8;
pkt |= (((msg->tx_len + 1) >> 8) & 0xffff) << 16;
} else {
pkt |= (((u8 *)msg->tx_buf)[0] << 8);
if (msg->tx_len > 1)
pkt |= (((u8 *)msg->tx_buf)[1] << 16);
}
pkt |= sun6i_dsi_ecc_compute(pkt) << 24;
return pkt;
}
static int sun6i_dsi_dcs_write_short(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
regmap_write_bits(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
0xff, (4 - 1));
sun6i_dsi_start(dsi, DSI_START_LPTX);
return msg->tx_len;
}
static int sun6i_dsi_dcs_write_long(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
int ret, len = 0;
u8 *bounce;
u16 crc;
regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
bounce = kzalloc(msg->tx_len + sizeof(crc), GFP_KERNEL);
if (!bounce)
return -ENOMEM;
memcpy(bounce, msg->tx_buf, msg->tx_len);
len += msg->tx_len;
crc = sun6i_dsi_crc_compute(bounce, msg->tx_len);
memcpy((u8 *)bounce + msg->tx_len, &crc, sizeof(crc));
len += sizeof(crc);
regmap_bulk_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(1), bounce, len);
regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG, len + 4 - 1);
kfree(bounce);
sun6i_dsi_start(dsi, DSI_START_LPTX);
ret = sun6i_dsi_inst_wait_for_completion(dsi);
if (ret < 0) {
sun6i_dsi_inst_abort(dsi);
return ret;
}
/*
* TODO: There's some bits (reg 0x200, bits 8/9) that
* apparently can be used to check whether the data have been
* sent, but I couldn't get it to work reliably.
*/
return msg->tx_len;
}
static int sun6i_dsi_dcs_read(struct sun6i_dsi *dsi,
const struct mipi_dsi_msg *msg)
{
u32 val;
int ret;
u8 byte0;
regmap_write(dsi->regs, SUN6I_DSI_CMD_TX_REG(0),
sun6i_dsi_dcs_build_pkt_hdr(dsi, msg));
regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
(4 - 1));
sun6i_dsi_start(dsi, DSI_START_LPRX);
ret = sun6i_dsi_inst_wait_for_completion(dsi);
if (ret < 0) {
sun6i_dsi_inst_abort(dsi);
return ret;
}
/*
* TODO: There's some bits (reg 0x200, bits 24/25) that
* apparently can be used to check whether the data have been
* received, but I couldn't get it to work reliably.
*/
regmap_read(dsi->regs, SUN6I_DSI_CMD_CTL_REG, &val);
if (val & SUN6I_DSI_CMD_CTL_RX_OVERFLOW)
return -EIO;
regmap_read(dsi->regs, SUN6I_DSI_CMD_RX_REG(0), &val);
byte0 = val & 0xff;
if (byte0 == MIPI_DSI_RX_ACKNOWLEDGE_AND_ERROR_REPORT)
return -EIO;
((u8 *)msg->rx_buf)[0] = (val >> 8);
return 1;
}
static int sun6i_dsi_attach(struct mipi_dsi_host *host,
struct mipi_dsi_device *device)
{
struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
dsi->device = device;
dsi->panel = of_drm_find_panel(device->dev.of_node);
if (IS_ERR(dsi->panel))
return PTR_ERR(dsi->panel);
dev_info(host->dev, "Attached device %s\n", device->name);
return 0;
}
static int sun6i_dsi_detach(struct mipi_dsi_host *host,
struct mipi_dsi_device *device)
{
struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
dsi->panel = NULL;
dsi->device = NULL;
return 0;
}
static ssize_t sun6i_dsi_transfer(struct mipi_dsi_host *host,
const struct mipi_dsi_msg *msg)
{
struct sun6i_dsi *dsi = host_to_sun6i_dsi(host);
int ret;
ret = sun6i_dsi_inst_wait_for_completion(dsi);
if (ret < 0)
sun6i_dsi_inst_abort(dsi);
regmap_write(dsi->regs, SUN6I_DSI_CMD_CTL_REG,
SUN6I_DSI_CMD_CTL_RX_OVERFLOW |
SUN6I_DSI_CMD_CTL_RX_FLAG |
SUN6I_DSI_CMD_CTL_TX_FLAG);
switch (msg->type) {
case MIPI_DSI_DCS_SHORT_WRITE:
case MIPI_DSI_DCS_SHORT_WRITE_PARAM:
ret = sun6i_dsi_dcs_write_short(dsi, msg);
break;
case MIPI_DSI_DCS_LONG_WRITE:
ret = sun6i_dsi_dcs_write_long(dsi, msg);
break;
case MIPI_DSI_DCS_READ:
if (msg->rx_len == 1) {
ret = sun6i_dsi_dcs_read(dsi, msg);
break;
}
default:
ret = -EINVAL;
}
return ret;
}
static const struct mipi_dsi_host_ops sun6i_dsi_host_ops = {
.attach = sun6i_dsi_attach,
.detach = sun6i_dsi_detach,
.transfer = sun6i_dsi_transfer,
};
static const struct regmap_config sun6i_dsi_regmap_config = {
.reg_bits = 32,
.val_bits = 32,
.reg_stride = 4,
.max_register = SUN6I_DSI_CMD_TX_REG(255),
.name = "mipi-dsi",
};
static int sun6i_dsi_bind(struct device *dev, struct device *master,
void *data)
{
struct drm_device *drm = data;
struct sun4i_drv *drv = drm->dev_private;
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
int ret;
if (!dsi->panel)
return -EPROBE_DEFER;
dsi->drv = drv;
drm_encoder_helper_add(&dsi->encoder,
&sun6i_dsi_enc_helper_funcs);
ret = drm_encoder_init(drm,
&dsi->encoder,
&sun6i_dsi_enc_funcs,
DRM_MODE_ENCODER_DSI,
NULL);
if (ret) {
dev_err(dsi->dev, "Couldn't initialise the DSI encoder\n");
return ret;
}
dsi->encoder.possible_crtcs = BIT(0);
drm_connector_helper_add(&dsi->connector,
&sun6i_dsi_connector_helper_funcs);
ret = drm_connector_init(drm, &dsi->connector,
&sun6i_dsi_connector_funcs,
DRM_MODE_CONNECTOR_DSI);
if (ret) {
dev_err(dsi->dev,
"Couldn't initialise the DSI connector\n");
goto err_cleanup_connector;
}
drm_connector_attach_encoder(&dsi->connector, &dsi->encoder);
drm_panel_attach(dsi->panel, &dsi->connector);
return 0;
err_cleanup_connector:
drm_encoder_cleanup(&dsi->encoder);
return ret;
}
static void sun6i_dsi_unbind(struct device *dev, struct device *master,
void *data)
{
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
drm_panel_detach(dsi->panel);
}
static const struct component_ops sun6i_dsi_ops = {
.bind = sun6i_dsi_bind,
.unbind = sun6i_dsi_unbind,
};
static int sun6i_dsi_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sun6i_dsi *dsi;
struct resource *res;
void __iomem *base;
int ret;
dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL);
if (!dsi)
return -ENOMEM;
dev_set_drvdata(dev, dsi);
dsi->dev = dev;
dsi->host.ops = &sun6i_dsi_host_ops;
dsi->host.dev = dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base)) {
dev_err(dev, "Couldn't map the DSI encoder registers\n");
return PTR_ERR(base);
}
dsi->regs = devm_regmap_init_mmio_clk(dev, "bus", base,
&sun6i_dsi_regmap_config);
if (IS_ERR(dsi->regs)) {
dev_err(dev, "Couldn't create the DSI encoder regmap\n");
return PTR_ERR(dsi->regs);
}
dsi->reset = devm_reset_control_get_shared(dev, NULL);
if (IS_ERR(dsi->reset)) {
dev_err(dev, "Couldn't get our reset line\n");
return PTR_ERR(dsi->reset);
}
dsi->mod_clk = devm_clk_get(dev, "mod");
if (IS_ERR(dsi->mod_clk)) {
dev_err(dev, "Couldn't get the DSI mod clock\n");
return PTR_ERR(dsi->mod_clk);
}
/*
* In order to operate properly, that clock seems to be always
* set to 297MHz.
*/
clk_set_rate_exclusive(dsi->mod_clk, 297000000);
dsi->dphy = devm_phy_get(dev, "dphy");
if (IS_ERR(dsi->dphy)) {
dev_err(dev, "Couldn't get the MIPI D-PHY\n");
ret = PTR_ERR(dsi->dphy);
goto err_unprotect_clk;
}
pm_runtime_enable(dev);
ret = mipi_dsi_host_register(&dsi->host);
if (ret) {
dev_err(dev, "Couldn't register MIPI-DSI host\n");
goto err_pm_disable;
}
ret = component_add(&pdev->dev, &sun6i_dsi_ops);
if (ret) {
dev_err(dev, "Couldn't register our component\n");
goto err_remove_dsi_host;
}
return 0;
err_remove_dsi_host:
mipi_dsi_host_unregister(&dsi->host);
err_pm_disable:
pm_runtime_disable(dev);
err_unprotect_clk:
clk_rate_exclusive_put(dsi->mod_clk);
return ret;
}
static int sun6i_dsi_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
component_del(&pdev->dev, &sun6i_dsi_ops);
mipi_dsi_host_unregister(&dsi->host);
pm_runtime_disable(dev);
clk_rate_exclusive_put(dsi->mod_clk);
return 0;
}
static int __maybe_unused sun6i_dsi_runtime_resume(struct device *dev)
{
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
reset_control_deassert(dsi->reset);
clk_prepare_enable(dsi->mod_clk);
/*
* Enable the DSI block.
*
* Some part of it can only be done once we get a number of
* lanes, see sun6i_dsi_inst_init
*/
regmap_write(dsi->regs, SUN6I_DSI_CTL_REG, SUN6I_DSI_CTL_EN);
regmap_write(dsi->regs, SUN6I_DSI_BASIC_CTL0_REG,
SUN6I_DSI_BASIC_CTL0_ECC_EN | SUN6I_DSI_BASIC_CTL0_CRC_EN);
regmap_write(dsi->regs, SUN6I_DSI_TRANS_START_REG, 10);
regmap_write(dsi->regs, SUN6I_DSI_TRANS_ZERO_REG, 0);
if (dsi->device)
sun6i_dsi_inst_init(dsi, dsi->device);
regmap_write(dsi->regs, SUN6I_DSI_DEBUG_DATA_REG, 0xff);
return 0;
}
static int __maybe_unused sun6i_dsi_runtime_suspend(struct device *dev)
{
struct sun6i_dsi *dsi = dev_get_drvdata(dev);
clk_disable_unprepare(dsi->mod_clk);
reset_control_assert(dsi->reset);
return 0;
}
static const struct dev_pm_ops sun6i_dsi_pm_ops = {
SET_RUNTIME_PM_OPS(sun6i_dsi_runtime_suspend,
sun6i_dsi_runtime_resume,
NULL)
};
static const struct of_device_id sun6i_dsi_of_table[] = {
{ .compatible = "allwinner,sun6i-a31-mipi-dsi" },
{ }
};
MODULE_DEVICE_TABLE(of, sun6i_dsi_of_table);
static struct platform_driver sun6i_dsi_platform_driver = {
.probe = sun6i_dsi_probe,
.remove = sun6i_dsi_remove,
.driver = {
.name = "sun6i-mipi-dsi",
.of_match_table = sun6i_dsi_of_table,
.pm = &sun6i_dsi_pm_ops,
},
};
module_platform_driver(sun6i_dsi_platform_driver);
MODULE_AUTHOR("Maxime Ripard <maxime.ripard@free-electrons.com>");
MODULE_DESCRIPTION("Allwinner A31 DSI Driver");
MODULE_LICENSE("GPL");
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