On Thu, 1 Apr 2021 at 16:19, <kalyan_t@xxxxxxxxxxxxxx> wrote: > > On 2021-04-01 07:37, Dmitry Baryshkov wrote: > > On 01/04/2021 01:47, Rob Clark wrote: > >> On Wed, Mar 31, 2021 at 9:03 AM Dmitry Baryshkov > >> <dmitry.baryshkov@xxxxxxxxxx> wrote: > >>> > >>> On 31/03/2021 14:27, Kalyan Thota wrote: > >>>> WARN_ON was introduced by the below commit to catch runtime resumes > >>>> that are getting triggered before icc path was set. > >>>> > >>>> "drm/msm/disp/dpu1: icc path needs to be set before dpu runtime > >>>> resume" > >>>> > >>>> For the targets where the bw scaling is not enabled, this WARN_ON is > >>>> a false alarm. Fix the WARN condition appropriately. > >>> > >>> Should we change all DPU targets to use bw scaling to the mdp from > >>> the > >>> mdss nodes? The limitation to sc7180 looks artificial. > >> > >> yes, we should, this keeps biting us on 845 > > > > Done, > > https://lore.kernel.org/linux-arm-msm/20210401020533.3956787-2-dmitry.baryshkov@xxxxxxxxxx/ > > Hi Dmitry, > > https://lore.kernel.org/linux-arm-msm/20210401020533.3956787-2-dmitry.baryshkov@xxxxxxxxxx/ > > you need to add clk_inefficiency_factor, bw_inefficiency_factor in the > catalogue for the new > targets where bw scaling is being enabled. please reuse sc7180 values. Done in patch 1 in that series. > > secondly, the AXI clock needs to be moved from mdss to mdp device like > as in sc7180 dt if its not done already. Is this enough: sm8250 has <&gcc GCC_DISP_HF_AXI_CLK> both in mdss and mdp nodes sdm845 has <&gcc GCC_DISP_AXI_CLK> in mdss node and <&dispcc DISP_CC_MDSS_AXI_CLK> in the mdp node. > > lastly, if you are planning to remove the static votes from dpu_mdss, do > you also want to move the > interconnect paths from mdss device to mdp device in the dt ? I have no strong opinion on this. So far I did not change dt to be compatible with the current device trees. > > > Thanks, > Kalyan > > > > >> > >>>> > >>>> Reported-by: Steev Klimaszewski <steev@xxxxxxxx> > >> > >> Please add Fixes: tag as well > Adding Fixes tag above my sign-off, should i push another version or can > it be picked from here ? > > Fixes: Id252b9c2887 ("drm/msm/disp/dpu1: icc path needs to be set before > dpu runtime resume") > >> > >>>> Signed-off-by: Kalyan Thota <kalyan_t@xxxxxxxxxxxxxx> > >>>> --- > >>>> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c | 8 +++++--- > >>>> drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h | 9 +++++++++ > >>>> drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c | 11 ++++++----- > >>>> 3 files changed, 20 insertions(+), 8 deletions(-) > >>>> > >>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > >>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > >>>> index cab387f..0071a4d 100644 > >>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > >>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.c > >>>> @@ -294,6 +294,9 @@ static int > >>>> dpu_kms_parse_data_bus_icc_path(struct dpu_kms *dpu_kms) > >>>> struct icc_path *path1; > >>>> struct drm_device *dev = dpu_kms->dev; > >>>> > >>>> + if (!dpu_supports_bw_scaling(dev)) > >>>> + return 0; > >>>> + > >>>> path0 = of_icc_get(dev->dev, "mdp0-mem"); > >>>> path1 = of_icc_get(dev->dev, "mdp1-mem"); > >>>> > >>>> @@ -934,8 +937,7 @@ static int dpu_kms_hw_init(struct msm_kms *kms) > >>>> DPU_DEBUG("REG_DMA is not defined"); > >>>> } > >>>> > >>>> - if (of_device_is_compatible(dev->dev->of_node, > >>>> "qcom,sc7180-mdss")) > >>>> - dpu_kms_parse_data_bus_icc_path(dpu_kms); > >>>> + dpu_kms_parse_data_bus_icc_path(dpu_kms); > >>>> > >>>> pm_runtime_get_sync(&dpu_kms->pdev->dev); > >>>> > >>>> @@ -1198,7 +1200,7 @@ static int __maybe_unused > >>>> dpu_runtime_resume(struct device *dev) > >>>> > >>>> ddev = dpu_kms->dev; > >>>> > >>>> - WARN_ON(!(dpu_kms->num_paths)); > >>>> + WARN_ON((dpu_supports_bw_scaling(ddev) && > >>>> !dpu_kms->num_paths)); > >>>> /* Min vote of BW is required before turning on AXI clk */ > >>>> for (i = 0; i < dpu_kms->num_paths; i++) > >>>> icc_set_bw(dpu_kms->path[i], 0, > >>>> Bps_to_icc(MIN_IB_BW)); > >>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h > >>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h > >>>> index d6717d6..f7bcc0a 100644 > >>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h > >>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_kms.h > >>>> @@ -154,6 +154,15 @@ struct vsync_info { > >>>> > >>>> #define to_dpu_global_state(x) container_of(x, struct > >>>> dpu_global_state, base) > >>>> > >>>> +/** > >>>> + * dpu_supports_bw_scaling: returns true for drivers that support > >>>> bw scaling. > >>>> + * @dev: Pointer to drm_device structure > >>>> + */ > >>>> +static inline int dpu_supports_bw_scaling(struct drm_device *dev) > >>>> +{ > >>>> + return of_device_is_compatible(dev->dev->of_node, > >>>> "qcom,sc7180-mdss"); > >>>> +} > >>>> + > >>>> /* Global private object state for tracking resources that are > >>>> shared across > >>>> * multiple kms objects (planes/crtcs/etc). > >>>> */ > >>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c > >>>> b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c > >>>> index cd40788..8cd712c 100644 > >>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c > >>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_mdss.c > >>>> @@ -41,6 +41,9 @@ static int dpu_mdss_parse_data_bus_icc_path(struct > >>>> drm_device *dev, > >>>> struct icc_path *path0 = of_icc_get(dev->dev, "mdp0-mem"); > >>>> struct icc_path *path1 = of_icc_get(dev->dev, "mdp1-mem"); > >>>> > >>>> + if (dpu_supports_bw_scaling(dev)) > >>>> + return 0; > >>>> + > >>>> if (IS_ERR_OR_NULL(path0)) > >>>> return PTR_ERR_OR_ZERO(path0); > >>>> > >>>> @@ -276,11 +279,9 @@ int dpu_mdss_init(struct drm_device *dev) > >>>> > >>>> DRM_DEBUG("mapped mdss address space @%pK\n", > >>>> dpu_mdss->mmio); > >>>> > >>>> - if (!of_device_is_compatible(dev->dev->of_node, > >>>> "qcom,sc7180-mdss")) { > >>>> - ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss); > >>>> - if (ret) > >>>> - return ret; > >>>> - } > >>>> + ret = dpu_mdss_parse_data_bus_icc_path(dev, dpu_mdss); > >>>> + if (ret) > >>>> + return ret; > >>>> > >>>> mp = &dpu_mdss->mp; > >>>> ret = msm_dss_parse_clock(pdev, mp); > >>>> > >>> > >>> > >>> -- > >>> With best wishes > >>> Dmitry -- With best wishes Dmitry
