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| author | Linus Walleij <linus.walleij@linaro.org> | 2020-08-10 00:51:04 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-09-05 02:26:30 +0300 |
| commit | 83ba7a7b3d4a70fe92122f039539566c9526228c (patch) | |
| tree | 1482143f42531f752b4436ae459b555f9f0bdd43 /drivers/gpu/drm/panel | |
| parent | 91867ac7d6724c31f32c3a63e2bb5db978893eaf (diff) | |
| download | linux-83ba7a7b3d4a70fe92122f039539566c9526228c.tar.xz | |
drm/panel: s6e63m0: Add code to identify panel
We add code to identify a few different panels mounted
on the s6e63m0 controller. This is necessary to achieve
the proper biasing with DSI versions of the panel.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Tested-by: Stephan Gerhold <stephan@gerhold.net>
Cc: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
Acked-by: Paul Cercueil <paul@crapouillou.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20200809215104.1830206-5-linus.walleij@linaro.org
Diffstat (limited to 'drivers/gpu/drm/panel')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 60 |
1 files changed, 60 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c index c53706edee44..842f8221be15 100644 --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c @@ -25,12 +25,21 @@ #define MCS_ELVSS_ON 0xb1 #define MCS_MIECTL1 0xc0 #define MCS_BCMODE 0xc1 +#define MCS_READ_ID1 0xda +#define MCS_READ_ID2 0xdb +#define MCS_READ_ID3 0xdc +#define MCS_LEVEL_2_KEY 0xf0 +#define MCS_MTP_KEY 0xf1 #define MCS_DISCTL 0xf2 #define MCS_SRCCTL 0xf6 #define MCS_IFCTL 0xf7 #define MCS_PANELCTL 0xF8 #define MCS_PGAMMACTL 0xfa +#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 11 #define GAMMA_TABLE_COUNT 23 @@ -90,6 +99,7 @@ struct s6e63m0 { int (*dcs_write)(struct device *dev, const u8 *data, size_t len); struct drm_panel panel; struct backlight_device *bl_dev; + u8 lcd_type; struct regulator_bulk_data supplies[2]; struct gpio_desc *reset_gpio; @@ -157,6 +167,47 @@ static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len) 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) { + DRM_DEV_ERROR(ctx->dev, "error checking LCD type (%d)\n", + ret); + ctx->lcd_type = 0x00; + return ret; + } + + DRM_DEV_INFO(ctx->dev, "MTP ID: %02x %02x %02x\n", id1, id2, id3); + + /* We attempt to detect what panel is mounted on the controller */ + switch (id2) { + case S6E63M0_LCD_ID_VALUE_M2: + DRM_DEV_INFO(ctx->dev, + "detected LCD panel AMS397GE MIPI M2\n"); + break; + case S6E63M0_LCD_ID_VALUE_SM2: + case S6E63M0_LCD_ID_VALUE_SM2_1: + DRM_DEV_INFO(ctx->dev, + "detected LCD panel AMS397GE MIPI SM2\n"); + break; + default: + DRM_DEV_INFO(ctx->dev, + "unknown LCD panel type %02x\n", id2); + break; + } + + ctx->lcd_type = id2; + + return 0; +} + static void s6e63m0_init(struct s6e63m0 *ctx) { s6e63m0_dcs_write_seq_static(ctx, MCS_PANELCTL, @@ -310,6 +361,15 @@ static int s6e63m0_prepare(struct drm_panel *panel) 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); |