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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-spi.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-spi.c')
| -rw-r--r-- | drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c index 0587eac52f2a..3b1a2a3a44ea 100644 --- a/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0-spi.c @@ -11,6 +11,17 @@ #define DATA_MASK 0x100 +static int s6e63m0_spi_dcs_read(struct device *dev, const u8 cmd, u8 *data) +{ + /* + * FIXME: implement reading DCS commands over SPI so we can + * properly identify which physical panel is connected. + */ + *data = 0; + + return 0; +} + static int s6e63m0_spi_write_word(struct device *dev, u16 data) { struct spi_device *spi = to_spi_device(dev); @@ -60,7 +71,8 @@ static int s6e63m0_spi_probe(struct spi_device *spi) DRM_DEV_ERROR(dev, "spi setup failed.\n"); return ret; } - return s6e63m0_probe(dev, s6e63m0_spi_dcs_write, false); + return s6e63m0_probe(dev, s6e63m0_spi_dcs_read, s6e63m0_spi_dcs_write, + false); } static int s6e63m0_spi_remove(struct spi_device *spi) |