On Wed, 17 Jan 2024 at 19:54, Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx> wrote:
>
> MSA MISC0 bit 1 to 7 contains Colorimetry Indicator Field. At
> current implementation, at DP_TEST_DYNAMIC_RANGE_CEA case the
In the current implementation, in the ... case
> Colorimetry Indicator Field is mistakenly left shifted one extra
> bit.
This doesn't make sense. You say that the value is mistakenly shifted,
but the shift is still in place in dp_catalog_ctrl_config_misc().
> This patch return correct value of colorimetry at
> dp_link_get_colorimetry_config() to fix this problem.
See Documentation/process/submitting-patches.rst#_describe_changes
>
> Changes in V2:
> -- drop retrieving colorimetry from colorspace
> -- drop dr = link->dp_link.test_video.test_dyn_range assignment
>
> Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support")
> Signed-off-by: Kuogee Hsieh <quic_khsieh@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/msm/dp/dp_link.c | 11 ++++++-----
> drivers/gpu/drm/msm/dp/dp_link.h | 3 +++
> 2 files changed, 9 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_link.c b/drivers/gpu/drm/msm/dp/dp_link.c
> index 98427d4..2e1bdaf 100644
> --- a/drivers/gpu/drm/msm/dp/dp_link.c
> +++ b/drivers/gpu/drm/msm/dp/dp_link.c
> @@ -1082,7 +1082,7 @@ int dp_link_process_request(struct dp_link *dp_link)
>
> int dp_link_get_colorimetry_config(struct dp_link *dp_link)
> {
> - u32 cc;
> + u32 cc = DP_MISC0_LEGACY_RGB;
> struct dp_link_private *link;
>
> if (!dp_link) {
> @@ -1096,10 +1096,11 @@ int dp_link_get_colorimetry_config(struct dp_link *dp_link)
> * Unless a video pattern CTS test is ongoing, use RGB_VESA
> * Only RGB_VESA and RGB_CEA supported for now
> */
> - if (dp_link_is_video_pattern_requested(link))
> - cc = link->dp_link.test_video.test_dyn_range;
> - else
> - cc = DP_TEST_DYNAMIC_RANGE_VESA;
> + if (dp_link_is_video_pattern_requested(link)) {
> + if (link->dp_link.test_video.test_dyn_range &
> + DP_TEST_DYNAMIC_RANGE_CEA)
> + cc = DP_MISC0_CEA_RGB;
> + }
>
> return cc;
> }
> diff --git a/drivers/gpu/drm/msm/dp/dp_link.h b/drivers/gpu/drm/msm/dp/dp_link.h
> index 9dd4dd9..fe8f716 100644
> --- a/drivers/gpu/drm/msm/dp/dp_link.h
> +++ b/drivers/gpu/drm/msm/dp/dp_link.h
> @@ -12,6 +12,9 @@
> #define DP_TEST_BIT_DEPTH_UNKNOWN 0xFFFFFFFF
> #define DP_LINK_CAP_ENHANCED_FRAMING (1 << 0)
>
> +#define DP_MISC0_LEGACY_RGB 0
> +#define DP_MISC0_CEA_RGB 0x04
These should go to dp_reg.h and should start with DP_MISC0_COLORIMETRY_CFG
> +
> struct dp_link_info {
> unsigned char revision;
> unsigned int rate;
> --
> 2.7.4
>
--
With best wishes
Dmitry
