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| author | Daniel Mentz <danielmentz@google.com> | 2023-01-16 17:49:07 -0500 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-11 16:31:40 +0100 |
| commit | f7abecc7c099b9bf2969806363230e8a6ef8c716 (patch) | |
| tree | b1ec2f8963da17c10375fe59f93276fc0b05fcba /include | |
| parent | ee6f7747e1001537080624025c2c9dcea1684f35 (diff) | |
| download | linux-stable-f7abecc7c099b9bf2969806363230e8a6ef8c716.tar.gz linux-stable-f7abecc7c099b9bf2969806363230e8a6ef8c716.tar.bz2 linux-stable-f7abecc7c099b9bf2969806363230e8a6ef8c716.zip | |
drm/mipi-dsi: Fix byte order of 16-bit DCS set/get brightness
[ Upstream commit c9d27c6be518b4ef2966d9564654ef99292ea1b3 ]
The MIPI DCS specification demands that brightness values are sent in
big endian byte order. It also states that one parameter (i.e. one byte)
shall be sent/received for 8 bit wide values, and two parameters shall
be used for values that are between 9 and 16 bits wide.
Add new functions to properly handle 16-bit brightness in big endian,
since the two 8- and 16-bit cases are distinct from each other.
[richard: use separate functions instead of switch/case]
[richard: split into 16-bit component]
Fixes: 1a9d759331b8 ("drm/dsi: Implement DCS set/get display brightness")
Signed-off-by: Daniel Mentz <danielmentz@google.com>
Link: https://android.googlesource.com/kernel/msm/+/754affd62d0ee268c686c53169b1dbb7deac8550
[richard: fix 16-bit brightness_get]
Signed-off-by: Richard Acayan <mailingradian@gmail.com>
Tested-by: Caleb Connolly <caleb@connolly.tech>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230116224909.23884-2-mailingradian@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/drm/drm_mipi_dsi.h | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/include/drm/drm_mipi_dsi.h b/include/drm/drm_mipi_dsi.h index 4fef19064b0f..689f615471ab 100644 --- a/include/drm/drm_mipi_dsi.h +++ b/include/drm/drm_mipi_dsi.h @@ -274,6 +274,10 @@ int mipi_dsi_dcs_set_display_brightness(struct mipi_dsi_device *dsi, u16 brightness); int mipi_dsi_dcs_get_display_brightness(struct mipi_dsi_device *dsi, u16 *brightness); +int mipi_dsi_dcs_set_display_brightness_large(struct mipi_dsi_device *dsi, + u16 brightness); +int mipi_dsi_dcs_get_display_brightness_large(struct mipi_dsi_device *dsi, + u16 *brightness); /** * struct mipi_dsi_driver - DSI driver |