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linux/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
Douglas Anderson d43f0fe153 drm/panel: s6e63m0: Don't store+check prepared/enabled 
As talked about in commit d2aacaf073 ("drm/panel: Check for already
prepared/enabled in drm_panel"), we want to remove needless code from
panel drivers that was storing and double-checking the
prepared/enabled state. Even if someone was relying on the
double-check before, that double-check is now in the core and not
needed in individual drivers.

For the s6e63m0 panel driver, this actually fixes a subtle/minor error
handling bug in s6e63m0_prepare(). In one error case s6e63m0_prepare()
called s6e63m0_unprepare() directly if there was an error. This call
to s6e63m0_unprepare() would have been a no-op since ctx->prepared
wasn't set yet.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230804140605.RFC.2.Iabafd062e70f6b6b554cf23eeb75f57a80f7e985@changeid
2023-09-13 08:36:18 -07:00

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// SPDX-License-Identifier: GPL-2.0
/*
* S6E63M0 AMOLED LCD drm_panel driver.
*
* Copyright (C) 2019 Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
* Derived from drivers/gpu/drm/panel-samsung-ld9040.c
*
* Andrzej Hajda <a.hajda@samsung.com>
*/
#include <drm/drm_modes.h>
#include <drm/drm_panel.h>
#include <linux/backlight.h>
#include <linux/delay.h>
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/regulator/consumer.h>
#include <linux/media-bus-format.h>
#include <video/mipi_display.h>
#include "panel-samsung-s6e63m0.h"
#define S6E63M0_LCD_ID_VALUE_M2 0xA4
#define S6E63M0_LCD_ID_VALUE_SM2 0xB4
#define S6E63M0_LCD_ID_VALUE_SM2_1 0xB6
#define NUM_GAMMA_LEVELS 28
#define GAMMA_TABLE_COUNT 23
#define MAX_BRIGHTNESS (NUM_GAMMA_LEVELS - 1)
/* array of gamma tables for gamma value 2.2 */
static u8 const s6e63m0_gamma_22[NUM_GAMMA_LEVELS][GAMMA_TABLE_COUNT] = {
/* 30 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0xA1, 0x51, 0x7B, 0xCE,
0xCB, 0xC2, 0xC7, 0xCB, 0xBC, 0xDA, 0xDD,
0xD3, 0x00, 0x53, 0x00, 0x52, 0x00, 0x6F, },
/* 40 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x97, 0x58, 0x71, 0xCC,
0xCB, 0xC0, 0xC5, 0xC9, 0xBA, 0xD9, 0xDC,
0xD1, 0x00, 0x5B, 0x00, 0x5A, 0x00, 0x7A, },
/* 50 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x96, 0x58, 0x72, 0xCB,
0xCA, 0xBF, 0xC6, 0xC9, 0xBA, 0xD6, 0xD9,
0xCD, 0x00, 0x61, 0x00, 0x61, 0x00, 0x83, },
/* 60 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x91, 0x5E, 0x6E, 0xC9,
0xC9, 0xBD, 0xC4, 0xC9, 0xB8, 0xD3, 0xD7,
0xCA, 0x00, 0x69, 0x00, 0x67, 0x00, 0x8D, },
/* 70 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x8E, 0x62, 0x6B, 0xC7,
0xC9, 0xBB, 0xC3, 0xC7, 0xB7, 0xD3, 0xD7,
0xCA, 0x00, 0x6E, 0x00, 0x6C, 0x00, 0x94, },
/* 80 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x89, 0x68, 0x65, 0xC9,
0xC9, 0xBC, 0xC1, 0xC5, 0xB6, 0xD2, 0xD5,
0xC9, 0x00, 0x73, 0x00, 0x72, 0x00, 0x9A, },
/* 90 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x89, 0x69, 0x64, 0xC7,
0xC8, 0xBB, 0xC0, 0xC5, 0xB4, 0xD2, 0xD5,
0xC9, 0x00, 0x77, 0x00, 0x76, 0x00, 0xA0, },
/* 100 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x86, 0x69, 0x60, 0xC6,
0xC8, 0xBA, 0xBF, 0xC4, 0xB4, 0xD0, 0xD4,
0xC6, 0x00, 0x7C, 0x00, 0x7A, 0x00, 0xA7, },
/* 110 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x86, 0x6A, 0x60, 0xC5,
0xC7, 0xBA, 0xBD, 0xC3, 0xB2, 0xD0, 0xD4,
0xC5, 0x00, 0x80, 0x00, 0x7E, 0x00, 0xAD, },
/* 120 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x82, 0x6B, 0x5E, 0xC4,
0xC8, 0xB9, 0xBD, 0xC2, 0xB1, 0xCE, 0xD2,
0xC4, 0x00, 0x85, 0x00, 0x82, 0x00, 0xB3, },
/* 130 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x8C, 0x6C, 0x60, 0xC3,
0xC7, 0xB9, 0xBC, 0xC1, 0xAF, 0xCE, 0xD2,
0xC3, 0x00, 0x88, 0x00, 0x86, 0x00, 0xB8, },
/* 140 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x80, 0x6C, 0x5F, 0xC1,
0xC6, 0xB7, 0xBC, 0xC1, 0xAE, 0xCD, 0xD0,
0xC2, 0x00, 0x8C, 0x00, 0x8A, 0x00, 0xBE, },
/* 150 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x80, 0x6E, 0x5F, 0xC1,
0xC6, 0xB6, 0xBC, 0xC0, 0xAE, 0xCC, 0xD0,
0xC2, 0x00, 0x8F, 0x00, 0x8D, 0x00, 0xC2, },
/* 160 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x7F, 0x6E, 0x5F, 0xC0,
0xC6, 0xB5, 0xBA, 0xBF, 0xAD, 0xCB, 0xCF,
0xC0, 0x00, 0x94, 0x00, 0x91, 0x00, 0xC8, },
/* 170 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x7C, 0x6D, 0x5C, 0xC0,
0xC6, 0xB4, 0xBB, 0xBE, 0xAD, 0xCA, 0xCF,
0xC0, 0x00, 0x96, 0x00, 0x94, 0x00, 0xCC, },
/* 180 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x7B, 0x6D, 0x5B, 0xC0,
0xC5, 0xB3, 0xBA, 0xBE, 0xAD, 0xCA, 0xCE,
0xBF, 0x00, 0x99, 0x00, 0x97, 0x00, 0xD0, },
/* 190 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x7A, 0x6D, 0x59, 0xC1,
0xC5, 0xB4, 0xB8, 0xBD, 0xAC, 0xC9, 0xCE,
0xBE, 0x00, 0x9D, 0x00, 0x9A, 0x00, 0xD5, },
/* 200 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x79, 0x6D, 0x58, 0xC1,
0xC4, 0xB4, 0xB6, 0xBD, 0xAA, 0xCA, 0xCD,
0xBE, 0x00, 0x9F, 0x00, 0x9D, 0x00, 0xD9, },
/* 210 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x79, 0x6D, 0x57, 0xC0,
0xC4, 0xB4, 0xB7, 0xBD, 0xAA, 0xC8, 0xCC,
0xBD, 0x00, 0xA2, 0x00, 0xA0, 0x00, 0xDD, },
/* 220 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x78, 0x6F, 0x58, 0xBF,
0xC4, 0xB3, 0xB5, 0xBB, 0xA9, 0xC8, 0xCC,
0xBC, 0x00, 0xA6, 0x00, 0xA3, 0x00, 0xE2, },
/* 230 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x75, 0x6F, 0x56, 0xBF,
0xC3, 0xB2, 0xB6, 0xBB, 0xA8, 0xC7, 0xCB,
0xBC, 0x00, 0xA8, 0x00, 0xA6, 0x00, 0xE6, },
/* 240 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x76, 0x6F, 0x56, 0xC0,
0xC3, 0xB2, 0xB5, 0xBA, 0xA8, 0xC6, 0xCB,
0xBB, 0x00, 0xAA, 0x00, 0xA8, 0x00, 0xE9, },
/* 250 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x74, 0x6D, 0x54, 0xBF,
0xC3, 0xB2, 0xB4, 0xBA, 0xA7, 0xC6, 0xCA,
0xBA, 0x00, 0xAD, 0x00, 0xAB, 0x00, 0xED, },
/* 260 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x74, 0x6E, 0x54, 0xBD,
0xC2, 0xB0, 0xB5, 0xBA, 0xA7, 0xC5, 0xC9,
0xBA, 0x00, 0xB0, 0x00, 0xAE, 0x00, 0xF1, },
/* 270 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x71, 0x6C, 0x50, 0xBD,
0xC3, 0xB0, 0xB4, 0xB8, 0xA6, 0xC6, 0xC9,
0xBB, 0x00, 0xB2, 0x00, 0xB1, 0x00, 0xF4, },
/* 280 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x6E, 0x6C, 0x4D, 0xBE,
0xC3, 0xB1, 0xB3, 0xB8, 0xA5, 0xC6, 0xC8,
0xBB, 0x00, 0xB4, 0x00, 0xB3, 0x00, 0xF7, },
/* 290 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x71, 0x70, 0x50, 0xBD,
0xC1, 0xB0, 0xB2, 0xB8, 0xA4, 0xC6, 0xC7,
0xBB, 0x00, 0xB6, 0x00, 0xB6, 0x00, 0xFA, },
/* 300 cd */
{ MCS_PGAMMACTL, 0x02,
0x18, 0x08, 0x24, 0x70, 0x6E, 0x4E, 0xBC,
0xC0, 0xAF, 0xB3, 0xB8, 0xA5, 0xC5, 0xC7,
0xBB, 0x00, 0xB9, 0x00, 0xB8, 0x00, 0xFC, },
};
#define NUM_ACL_LEVELS 7
#define ACL_TABLE_COUNT 28
static u8 const s6e63m0_acl[NUM_ACL_LEVELS][ACL_TABLE_COUNT] = {
/* NULL ACL */
{ MCS_BCMODE,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00 },
/* 40P ACL */
{ MCS_BCMODE,
0x4D, 0x96, 0x1D, 0x00, 0x00, 0x01, 0xDF, 0x00,
0x00, 0x03, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x06, 0x0C, 0x11, 0x16, 0x1C, 0x21, 0x26,
0x2B, 0x31, 0x36 },
/* 43P ACL */
{ MCS_BCMODE,
0x4D, 0x96, 0x1D, 0x00, 0x00, 0x01, 0xDF, 0x00,
0x00, 0x03, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x07, 0x0C, 0x12, 0x18, 0x1E, 0x23, 0x29,
0x2F, 0x34, 0x3A },
/* 45P ACL */
{ MCS_BCMODE,
0x4D, 0x96, 0x1D, 0x00, 0x00, 0x01, 0xDF, 0x00,
0x00, 0x03, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x07, 0x0D, 0x13, 0x19, 0x1F, 0x25, 0x2B,
0x31, 0x37, 0x3D },
/* 47P ACL */
{ MCS_BCMODE,
0x4D, 0x96, 0x1D, 0x00, 0x00, 0x01, 0xDF, 0x00,
0x00, 0x03, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x07, 0x0E, 0x14, 0x1B, 0x21, 0x27, 0x2E,
0x34, 0x3B, 0x41 },
/* 48P ACL */
{ MCS_BCMODE,
0x4D, 0x96, 0x1D, 0x00, 0x00, 0x01, 0xDF, 0x00,
0x00, 0x03, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x08, 0x0E, 0x15, 0x1B, 0x22, 0x29, 0x2F,
0x36, 0x3C, 0x43 },
/* 50P ACL */
{ MCS_BCMODE,
0x4D, 0x96, 0x1D, 0x00, 0x00, 0x01, 0xDF, 0x00,
0x00, 0x03, 0x1F, 0x00, 0x00, 0x00, 0x00, 0x00,
0x01, 0x08, 0x0F, 0x16, 0x1D, 0x24, 0x2A, 0x31,
0x38, 0x3F, 0x46 },
};
/* This tells us which ACL level goes with which gamma */
static u8 const s6e63m0_acl_per_gamma[NUM_GAMMA_LEVELS] = {
/* 30 - 60 cd: ACL off/NULL */
0, 0, 0, 0,
/* 70 - 250 cd: 40P ACL */
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
/* 260 - 300 cd: 50P ACL */
6, 6, 6, 6, 6,
};
/* The ELVSS backlight regulator has 5 levels */
#define S6E63M0_ELVSS_LEVELS 5
static u8 const s6e63m0_elvss_offsets[S6E63M0_ELVSS_LEVELS] = {
0x00, /* not set */
0x0D, /* 30 cd - 100 cd */
0x09, /* 110 cd - 160 cd */
0x07, /* 170 cd - 200 cd */
0x00, /* 210 cd - 300 cd */
};
/* This tells us which ELVSS level goes with which gamma */
static u8 const s6e63m0_elvss_per_gamma[NUM_GAMMA_LEVELS] = {
/* 30 - 100 cd */
1, 1, 1, 1, 1, 1, 1, 1,
/* 110 - 160 cd */
2, 2, 2, 2, 2, 2,
/* 170 - 200 cd */
3, 3, 3, 3,
/* 210 - 300 cd */
4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
};
struct s6e63m0 {
struct device *dev;
void *transport_data;
int (*dcs_read)(struct device *dev, void *trsp, const u8 cmd, u8 *val);
int (*dcs_write)(struct device *dev, void *trsp, const u8 *data, size_t len);
struct drm_panel panel;
struct backlight_device *bl_dev;
u8 lcd_type;
u8 elvss_pulse;
bool dsi_mode;
struct regulator_bulk_data supplies[2];
struct gpio_desc *reset_gpio;
/*
* This field is tested by functions directly accessing bus before
* transfer, transfer is skipped if it is set. In case of transfer
* failure or unexpected response the field is set to error value.
* Such construct allows to eliminate many checks in higher level
* functions.
*/
int error;
};
static const struct drm_display_mode default_mode = {
.clock = 25628,
.hdisplay = 480,
.hsync_start = 480 + 16,
.hsync_end = 480 + 16 + 2,
.htotal = 480 + 16 + 2 + 16,
.vdisplay = 800,
.vsync_start = 800 + 28,
.vsync_end = 800 + 28 + 2,
.vtotal = 800 + 28 + 2 + 1,
.width_mm = 53,
.height_mm = 89,
.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
};
static inline struct s6e63m0 *panel_to_s6e63m0(struct drm_panel *panel)
{
return container_of(panel, struct s6e63m0, panel);
}
static int s6e63m0_clear_error(struct s6e63m0 *ctx)
{
int ret = ctx->error;
ctx->error = 0;
return ret;
}
static void s6e63m0_dcs_read(struct s6e63m0 *ctx, const u8 cmd, u8 *data)
{
if (ctx->error < 0)
return;
ctx->error = ctx->dcs_read(ctx->dev, ctx->transport_data, cmd, data);
}
static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len)
{
if (ctx->error < 0 || len == 0)
return;
ctx->error = ctx->dcs_write(ctx->dev, ctx->transport_data, data, len);
}
#define s6e63m0_dcs_write_seq_static(ctx, seq ...) \
({ \
static const u8 d[] = { seq }; \
s6e63m0_dcs_write(ctx, d, ARRAY_SIZE(d)); \
})
static int s6e63m0_check_lcd_type(struct s6e63m0 *ctx)
{
u8 id1, id2, id3;
int ret;
s6e63m0_dcs_read(ctx, MCS_READ_ID1, &id1);
s6e63m0_dcs_read(ctx, MCS_READ_ID2, &id2);
s6e63m0_dcs_read(ctx, MCS_READ_ID3, &id3);
ret = s6e63m0_clear_error(ctx);
if (ret) {
dev_err(ctx->dev, "error checking LCD type (%d)\n", ret);
ctx->lcd_type = 0x00;
return ret;
}
dev_info(ctx->dev, "MTP ID: %02x %02x %02x\n", id1, id2, id3);
/*
* We attempt to detect what panel is mounted on the controller.
* The third ID byte represents the desired ELVSS pulse for
* some displays.
*/
switch (id2) {
case S6E63M0_LCD_ID_VALUE_M2:
dev_info(ctx->dev, "detected LCD panel AMS397GE MIPI M2\n");
ctx->elvss_pulse = id3;
break;
case S6E63M0_LCD_ID_VALUE_SM2:
case S6E63M0_LCD_ID_VALUE_SM2_1:
dev_info(ctx->dev, "detected LCD panel AMS397GE MIPI SM2\n");
ctx->elvss_pulse = id3;
break;
default:
dev_info(ctx->dev, "unknown LCD panel type %02x\n", id2);
/* Default ELVSS pulse level */
ctx->elvss_pulse = 0x16;
break;
}
ctx->lcd_type = id2;
return 0;
}
static void s6e63m0_init(struct s6e63m0 *ctx)
{
/*
* We do not know why there is a difference in the DSI mode.
* (No datasheet.)
*
* In the vendor driver this sequence is called
* "SEQ_PANEL_CONDITION_SET" or "DCS_CMD_SEQ_PANEL_COND_SET".
*/
if (ctx->dsi_mode)
s6e63m0_dcs_write_seq_static(ctx, MCS_PANELCTL,
0x01, 0x2c, 0x2c, 0x07, 0x07, 0x5f, 0xb3,
0x6d, 0x97, 0x1d, 0x3a, 0x0f, 0x00, 0x00);
else
s6e63m0_dcs_write_seq_static(ctx, MCS_PANELCTL,
0x01, 0x27, 0x27, 0x07, 0x07, 0x54, 0x9f,
0x63, 0x8f, 0x1a, 0x33, 0x0d, 0x00, 0x00);
s6e63m0_dcs_write_seq_static(ctx, MCS_DISCTL,
0x02, 0x03, 0x1c, 0x10, 0x10);
s6e63m0_dcs_write_seq_static(ctx, MCS_IFCTL,
0x03, 0x00, 0x00);
s6e63m0_dcs_write_seq_static(ctx, MCS_PGAMMACTL,
0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33,
0xb6, 0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1,
0xc1, 0xb7, 0x00, 0x9c, 0x00, 0x9f, 0x00,
0xd6);
s6e63m0_dcs_write_seq_static(ctx, MCS_PGAMMACTL,
0x01);
s6e63m0_dcs_write_seq_static(ctx, MCS_SRCCTL,
0x00, 0x8e, 0x07);
s6e63m0_dcs_write_seq_static(ctx, MCS_PENTILE_1, 0x6c);
s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_DELTA_Y_RED,
0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
0x21, 0x20, 0x1e, 0x1e);
s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_DELTA_X_RED,
0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66);
s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_DELTA_Y_GREEN,
0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
0x21, 0x20, 0x1e, 0x1e);
s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_DELTA_X_GREEN,
0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66);
s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_DELTA_Y_BLUE,
0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
0x21, 0x20, 0x1e, 0x1e);
s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_DELTA_X_BLUE,
0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
0x66, 0x66);
s6e63m0_dcs_write_seq_static(ctx, MCS_BCMODE,
0x4d, 0x96, 0x1d, 0x00, 0x00, 0x01, 0xdf,
0x00, 0x00, 0x03, 0x1f, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x06,
0x09, 0x0d, 0x0f, 0x12, 0x15, 0x18);
s6e63m0_dcs_write_seq_static(ctx, MCS_TEMP_SWIRE,
0x10, 0x10, 0x0b, 0x05);
s6e63m0_dcs_write_seq_static(ctx, MCS_MIECTL1,
0x01);
s6e63m0_dcs_write_seq_static(ctx, MCS_ELVSS_ON,
0x0b);
}
static int s6e63m0_power_on(struct s6e63m0 *ctx)
{
int ret;
ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
if (ret < 0)
return ret;
msleep(25);
/* Be sure to send a reset pulse */
gpiod_set_value(ctx->reset_gpio, 1);
msleep(5);
gpiod_set_value(ctx->reset_gpio, 0);
msleep(120);
return 0;
}
static int s6e63m0_power_off(struct s6e63m0 *ctx)
{
int ret;
gpiod_set_value(ctx->reset_gpio, 1);
msleep(120);
ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
if (ret < 0)
return ret;
return 0;
}
static int s6e63m0_disable(struct drm_panel *panel)
{
struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
backlight_disable(ctx->bl_dev);
s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_OFF);
msleep(10);
s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
msleep(120);
return 0;
}
static int s6e63m0_unprepare(struct drm_panel *panel)
{
struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
int ret;
s6e63m0_clear_error(ctx);
ret = s6e63m0_power_off(ctx);
if (ret < 0)
return ret;
return 0;
}
static int s6e63m0_prepare(struct drm_panel *panel)
{
struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
int ret;
ret = s6e63m0_power_on(ctx);
if (ret < 0)
return ret;
/* Magic to unlock level 2 control of the display */
s6e63m0_dcs_write_seq_static(ctx, MCS_LEVEL_2_KEY, 0x5a, 0x5a);
/* Magic to unlock MTP reading */
s6e63m0_dcs_write_seq_static(ctx, MCS_MTP_KEY, 0x5a, 0x5a);
ret = s6e63m0_check_lcd_type(ctx);
if (ret < 0)
return ret;
s6e63m0_init(ctx);
ret = s6e63m0_clear_error(ctx);
if (ret < 0)
s6e63m0_unprepare(panel);
return ret;
}
static int s6e63m0_enable(struct drm_panel *panel)
{
struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_EXIT_SLEEP_MODE);
msleep(120);
s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_SET_DISPLAY_ON);
msleep(10);
s6e63m0_dcs_write_seq_static(ctx, MCS_ERROR_CHECK,
0xE7, 0x14, 0x60, 0x17, 0x0A, 0x49, 0xC3,
0x8F, 0x19, 0x64, 0x91, 0x84, 0x76, 0x20,
0x0F, 0x00);
backlight_enable(ctx->bl_dev);
return 0;
}
static int s6e63m0_get_modes(struct drm_panel *panel,
struct drm_connector *connector)
{
struct drm_display_mode *mode;
static const u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24;
mode = drm_mode_duplicate(connector->dev, &default_mode);
if (!mode) {
dev_err(panel->dev, "failed to add mode %ux%u@%u\n",
default_mode.hdisplay, default_mode.vdisplay,
drm_mode_vrefresh(&default_mode));
return -ENOMEM;
}
connector->display_info.width_mm = mode->width_mm;
connector->display_info.height_mm = mode->height_mm;
drm_display_info_set_bus_formats(&connector->display_info,
&bus_format, 1);
connector->display_info.bus_flags = DRM_BUS_FLAG_DE_LOW |
DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE;
drm_mode_set_name(mode);
mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
drm_mode_probed_add(connector, mode);
return 1;
}
static const struct drm_panel_funcs s6e63m0_drm_funcs = {
.disable = s6e63m0_disable,
.unprepare = s6e63m0_unprepare,
.prepare = s6e63m0_prepare,
.enable = s6e63m0_enable,
.get_modes = s6e63m0_get_modes,
};
static int s6e63m0_set_brightness(struct backlight_device *bd)
{
struct s6e63m0 *ctx = bl_get_data(bd);
int brightness = bd->props.brightness;
u8 elvss_val;
u8 elvss_cmd_set[5];
int i;
/* Adjust ELVSS to candela level */
i = s6e63m0_elvss_per_gamma[brightness];
elvss_val = ctx->elvss_pulse + s6e63m0_elvss_offsets[i];
if (elvss_val > 0x1f)
elvss_val = 0x1f;
elvss_cmd_set[0] = MCS_TEMP_SWIRE;
elvss_cmd_set[1] = elvss_val;
elvss_cmd_set[2] = elvss_val;
elvss_cmd_set[3] = elvss_val;
elvss_cmd_set[4] = elvss_val;
s6e63m0_dcs_write(ctx, elvss_cmd_set, 5);
/* Update the ACL per gamma value */
i = s6e63m0_acl_per_gamma[brightness];
s6e63m0_dcs_write(ctx, s6e63m0_acl[i],
ARRAY_SIZE(s6e63m0_acl[i]));
/* Update gamma table */
s6e63m0_dcs_write(ctx, s6e63m0_gamma_22[brightness],
ARRAY_SIZE(s6e63m0_gamma_22[brightness]));
s6e63m0_dcs_write_seq_static(ctx, MCS_PGAMMACTL, 0x03);
return s6e63m0_clear_error(ctx);
}
static const struct backlight_ops s6e63m0_backlight_ops = {
.update_status = s6e63m0_set_brightness,
};
static int s6e63m0_backlight_register(struct s6e63m0 *ctx, u32 max_brightness)
{
struct backlight_properties props = {
.type = BACKLIGHT_RAW,
.brightness = max_brightness,
.max_brightness = max_brightness,
};
struct device *dev = ctx->dev;
int ret = 0;
ctx->bl_dev = devm_backlight_device_register(dev, "panel", dev, ctx,
&s6e63m0_backlight_ops,
&props);
if (IS_ERR(ctx->bl_dev)) {
ret = PTR_ERR(ctx->bl_dev);
dev_err(dev, "error registering backlight device (%d)\n", ret);
}
return ret;
}
int s6e63m0_probe(struct device *dev, void *trsp,
int (*dcs_read)(struct device *dev, void *trsp, const u8 cmd, u8 *val),
int (*dcs_write)(struct device *dev, void *trsp, const u8 *data, size_t len),
bool dsi_mode)
{
struct s6e63m0 *ctx;
u32 max_brightness;
int ret;
ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->transport_data = trsp;
ctx->dsi_mode = dsi_mode;
ctx->dcs_read = dcs_read;
ctx->dcs_write = dcs_write;
dev_set_drvdata(dev, ctx);
ctx->dev = dev;
ret = device_property_read_u32(dev, "max-brightness", &max_brightness);
if (ret)
max_brightness = MAX_BRIGHTNESS;
if (max_brightness > MAX_BRIGHTNESS) {
dev_err(dev, "illegal max brightness specified\n");
max_brightness = MAX_BRIGHTNESS;
}
ctx->supplies[0].supply = "vdd3";
ctx->supplies[1].supply = "vci";
ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
ctx->supplies);
if (ret < 0) {
dev_err(dev, "failed to get regulators: %d\n", ret);
return ret;
}
ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_HIGH);
if (IS_ERR(ctx->reset_gpio)) {
dev_err(dev, "cannot get reset-gpios %ld\n", PTR_ERR(ctx->reset_gpio));
return PTR_ERR(ctx->reset_gpio);
}
drm_panel_init(&ctx->panel, dev, &s6e63m0_drm_funcs,
dsi_mode ? DRM_MODE_CONNECTOR_DSI :
DRM_MODE_CONNECTOR_DPI);
ret = s6e63m0_backlight_register(ctx, max_brightness);
if (ret < 0)
return ret;
drm_panel_add(&ctx->panel);
return 0;
}
EXPORT_SYMBOL_GPL(s6e63m0_probe);
void s6e63m0_remove(struct device *dev)
{
struct s6e63m0 *ctx = dev_get_drvdata(dev);
drm_panel_remove(&ctx->panel);
}
EXPORT_SYMBOL_GPL(s6e63m0_remove);
MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
MODULE_DESCRIPTION("s6e63m0 LCD Driver");
MODULE_LICENSE("GPL v2");
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