| Message ID | 20240730175541.2549592-1-quic_abhinavk@quicinc.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2] drm/msm/dp: fix the max supported bpp logic | expand |
Quoting Abhinav Kumar (2024-07-30 10:55:40) > Fix the dp_panel_get_supported_bpp() API to return the minimum > supported bpp correctly for relevant cases and use this API > to correct the behavior of DP driver which hard-codes the max supported > bpp to 30. > > This is incorrect because the number of lanes and max data rate > supported by the lanes need to be taken into account. > > Replace the hardcoded limit with the appropriate math which accounts > for the accurate number of lanes and max data rate. > > changes in v2: > - Fix the dp_panel_get_supported_bpp() and use it > - Drop the max_t usage as dp_panel_get_supported_bpp() already > returns the min_bpp correctly now > > Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") > Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/43 > Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> > Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> # SM8350-HDK > Signed-off-by: Stephen Boyd <swboyd@chromium.org> > Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com> > --- One note below, Reviewed-by: Stephen Boyd <swboyd@chromium.org> > diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c > index a916b5f3b317..3777b1abacad 100644 > --- a/drivers/gpu/drm/msm/dp/dp_panel.c > +++ b/drivers/gpu/drm/msm/dp/dp_panel.c > @@ -90,22 +90,22 @@ static int dp_panel_read_dpcd(struct dp_panel *dp_panel) > static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel, > u32 mode_edid_bpp, u32 mode_pclk_khz) > { > - struct dp_link_info *link_info; > + const struct dp_link_info *link_info; > const u32 max_supported_bpp = 30, min_supported_bpp = 18; > - u32 bpp = 0, data_rate_khz = 0; > + u32 bpp, data_rate_khz; > > bpp = min_t(u32, mode_edid_bpp, max_supported_bpp); This can be min() because all types are u32. > > link_info = &dp_panel->link_info; > data_rate_khz = link_info->num_lanes * link_info->rate * 8; > > - while (bpp > min_supported_bpp) { > + do { > if (mode_pclk_khz * bpp <= data_rate_khz) > - break; > + return bpp; > bpp -= 6; > - } > + } while (bpp > min_supported_bpp); > > - return bpp; > + return min_supported_bpp; > } > > int dp_panel_read_sink_caps(struct dp_panel *dp_panel,
diff --git a/drivers/gpu/drm/msm/dp/dp_panel.c b/drivers/gpu/drm/msm/dp/dp_panel.c index a916b5f3b317..3777b1abacad 100644 --- a/drivers/gpu/drm/msm/dp/dp_panel.c +++ b/drivers/gpu/drm/msm/dp/dp_panel.c @@ -90,22 +90,22 @@ static int dp_panel_read_dpcd(struct dp_panel *dp_panel) static u32 dp_panel_get_supported_bpp(struct dp_panel *dp_panel, u32 mode_edid_bpp, u32 mode_pclk_khz) { - struct dp_link_info *link_info; + const struct dp_link_info *link_info; const u32 max_supported_bpp = 30, min_supported_bpp = 18; - u32 bpp = 0, data_rate_khz = 0; + u32 bpp, data_rate_khz; bpp = min_t(u32, mode_edid_bpp, max_supported_bpp); link_info = &dp_panel->link_info; data_rate_khz = link_info->num_lanes * link_info->rate * 8; - while (bpp > min_supported_bpp) { + do { if (mode_pclk_khz * bpp <= data_rate_khz) - break; + return bpp; bpp -= 6; - } + } while (bpp > min_supported_bpp); - return bpp; + return min_supported_bpp; } int dp_panel_read_sink_caps(struct dp_panel *dp_panel, @@ -423,8 +423,9 @@ int dp_panel_init_panel_info(struct dp_panel *dp_panel) drm_mode->clock); drm_dbg_dp(panel->drm_dev, "bpp = %d\n", dp_panel->dp_mode.bpp); - dp_panel->dp_mode.bpp = max_t(u32, 18, - min_t(u32, dp_panel->dp_mode.bpp, 30)); + dp_panel->dp_mode.bpp = dp_panel_get_mode_bpp(dp_panel, dp_panel->dp_mode.bpp, + dp_panel->dp_mode.drm_mode.clock); + drm_dbg_dp(panel->drm_dev, "updated bpp = %d\n", dp_panel->dp_mode.bpp);
Fix the dp_panel_get_supported_bpp() API to return the minimum supported bpp correctly for relevant cases and use this API to correct the behavior of DP driver which hard-codes the max supported bpp to 30. This is incorrect because the number of lanes and max data rate supported by the lanes need to be taken into account. Replace the hardcoded limit with the appropriate math which accounts for the accurate number of lanes and max data rate. changes in v2: - Fix the dp_panel_get_supported_bpp() and use it - Drop the max_t usage as dp_panel_get_supported_bpp() already returns the min_bpp correctly now Fixes: c943b4948b58 ("drm/msm/dp: add displayPort driver support") Closes: https://gitlab.freedesktop.org/drm/msm/-/issues/43 Reported-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> Tested-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org> # SM8350-HDK Signed-off-by: Stephen Boyd <swboyd@chromium.org> Signed-off-by: Abhinav Kumar <quic_abhinavk@quicinc.com> --- drivers/gpu/drm/msm/dp/dp_panel.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-)