On Tue 27 Oct 05:23 CDT 2020, Dmitry Baryshkov wrote:

c33b7c0389e1 ("drm/msm/dpu: add support for clk and bw scaling for display") has added support for handling bandwidth voting in kms path in addition to old mdss path. However this broke all other platforms since _dpu_core_perf_crtc_update_bus() will now error out instead of properly calculating bandwidth and core clocks. Fix _dpu_core_perf_crtc_update_bus() to just skip bandwidth setting instead of returning an error in case kms->num_paths == 0 (MDSS is used for bandwidth management).

Signed-off-by: Dmitry Baryshkov dmitry.baryshkov@linaro.org

Reviewed-by: Bjorn Andersson bjorn.andersson@linaro.org

Thanks Dmitry, Bjorn

Fixes: c33b7c0389e1 ("drm/msm/dpu: add support for clk and bw scaling for display")

drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c index 393858ef8a83..37c8270681c2 100644 --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_core_perf.c @@ -219,9 +219,6 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms, int i, ret = 0; u64 avg_bw;

• if (!kms->num_paths)

• return -EINVAL;
  

• drm_for_each_crtc(tmp_crtc, crtc->dev) { if (tmp_crtc->enabled && curr_client_type ==

@@ -239,6 +236,9 @@ static int _dpu_core_perf_crtc_update_bus(struct dpu_kms *kms, } }

• if (!kms->num_paths)

• return 0;
  

• avg_bw = perf.bw_ctl; do_div(avg_bw, (kms->num_paths * 1000)); /*Bps_to_icc*/

-- 2.28.0