On Tue, Aug 19, 2025 at 11:33:33AM +0800, Yongxing Mou wrote:
> The Qualcomm QCS8300 platform comes with one DisplayPort controller
> with same base offset as SM8650. But it requires new compatible string
> because QCS8300 controller supports 4 MST streams. 4 MST streams will
> be enabled as part of MST feature support. Currently, using SM8650 as
> fallback to enable SST on QCS8300.
Hmm, no, you are not using SM8650 as a fallback. You are using the data
structure for SM8650 for QCS8300. That's a different thing. It would
have been using SM8650 as fallback, if you had declared device with two
compatibles, qcom,qcs8300-dp and qcom,sm8650-dp, and then relied on the
second entry (only) to provide a match and data.
Exactly the same comment applies to the UBWC patch.
>
> Reviewed-by: Dmitry Baryshkov <dmitry.barysh...@oss.qualcomm.com>
> Signed-off-by: Yongxing Mou <yongxing....@oss.qualcomm.com>
> ---
> drivers/gpu/drm/msm/dp/dp_display.c | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
> b/drivers/gpu/drm/msm/dp/dp_display.c
> index
> d87d47cc7ec3eb757ac192c411000bc50b824c59..bb4660585849d1a67921a28e7e12422e0c327ab2
> 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -187,6 +187,7 @@ static const struct msm_dp_desc msm_dp_desc_x1e80100[] = {
> };
>
> static const struct of_device_id msm_dp_dt_match[] = {
> + { .compatible = "qcom,qcs8300-dp", .data = &msm_dp_desc_sm8650 },
> { .compatible = "qcom,sa8775p-dp", .data = &msm_dp_desc_sa8775p },
> { .compatible = "qcom,sc7180-dp", .data = &msm_dp_desc_sc7180 },
> { .compatible = "qcom,sc7280-dp", .data = &msm_dp_desc_sc7280 },
>
> --
> 2.34.1
>
--
With best wishes
Dmitry
