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| author | Linus Walleij <linus.walleij@linaro.org> | 2020-08-10 00:51:03 +0300 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-09-05 02:24:26 +0300 |
| commit | 91867ac7d6724c31f32c3a63e2bb5db978893eaf (patch) | |
| tree | fe74aa328935fcca5446aa09f28416a935f63f75 /drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | |
| parent | 435e06c06cb2e3bd2f650a52641ddb13a95a1624 (diff) | |
| download | linux-91867ac7d6724c31f32c3a63e2bb5db978893eaf.tar.xz | |
drm/panel: s6e63m0: Add reading functionality
This adds code to send read commands to read a single
byte from the display, in order to perform MTP ID
look-up of the mounted panel on the s6e63m0 controller.
This is needed for proper biasing on the DSI variants.
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/20200809215104.1830206-4-linus.walleij@linaro.org
Diffstat (limited to 'drivers/gpu/drm/panel/panel-samsung-s6e63m0.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c index 260c51642b25..c53706edee44 100644 --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c @@ -86,6 +86,7 @@ static u8 const s6e63m0_gamma_22[NUM_GAMMA_LEVELS][GAMMA_TABLE_COUNT] = { struct s6e63m0 { struct device *dev; + int (*dcs_read)(struct device *dev, const u8 cmd, u8 *val); int (*dcs_write)(struct device *dev, const u8 *data, size_t len); struct drm_panel panel; struct backlight_device *bl_dev; @@ -134,6 +135,14 @@ static int s6e63m0_clear_error(struct s6e63m0 *ctx) 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, cmd, data); +} + static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len) { if (ctx->error < 0 || len == 0) @@ -400,6 +409,7 @@ static int s6e63m0_backlight_register(struct s6e63m0 *ctx) } int s6e63m0_probe(struct device *dev, + int (*dcs_read)(struct device *dev, const u8 cmd, u8 *val), int (*dcs_write)(struct device *dev, const u8 *data, size_t len), bool dsi_mode) { @@ -410,6 +420,7 @@ int s6e63m0_probe(struct device *dev, if (!ctx) return -ENOMEM; + ctx->dcs_read = dcs_read; ctx->dcs_write = dcs_write; dev_set_drvdata(dev, ctx); |