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| author |   Linus Walleij <linus.walleij@linaro.org> | 2020-08-09 23:51:03 +0200 |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2020-09-05 01:24:26 +0200 |
| commit | 91867ac7d6724c31f32c3a63e2bb5db978893eaf (patch) | |
| tree | fe74aa328935fcca5446aa09f28416a935f63f75 /drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c | |
| parent | drm/panel: s6e63m0: Add DSI transport (diff) | |
| download | linux-dev-91867ac7d6724c31f32c3a63e2bb5db978893eaf.tar.xz linux-dev-91867ac7d6724c31f32c3a63e2bb5db978893eaf.zip | |
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-dsi.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c index f4927a6ce26d..2ec9e7900791 100644 --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-dsi.c @@ -16,6 +16,22 @@ #define MCS_GLOBAL_PARAM 0xb0 #define S6E63M0_DSI_MAX_CHUNK 15 /* CMD + 15 bytes max */ +static int s6e63m0_dsi_dcs_read(struct device *dev, const u8 cmd, u8 *data) +{ + struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); + int ret; + + ret = mipi_dsi_dcs_read(dsi, cmd, data, 1); + if (ret < 0) { + DRM_DEV_ERROR(dev, "could not read DCS CMD %02x\n", cmd); + return ret; + } + + DRM_DEV_INFO(dev, "DSI read CMD %02x = %02x\n", cmd, *data); + + return 0; +} + static int s6e63m0_dsi_dcs_write(struct device *dev, const u8 *data, size_t len) { struct mipi_dsi_device *dsi = to_mipi_dsi_device(dev); @@ -90,7 +106,8 @@ static int s6e63m0_dsi_probe(struct mipi_dsi_device *dsi) MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_BURST; - ret = s6e63m0_probe(dev, s6e63m0_dsi_dcs_write, true); + ret = s6e63m0_probe(dev, s6e63m0_dsi_dcs_read, s6e63m0_dsi_dcs_write, + true); if (ret) return ret; |