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SubjectRe: [PATCH v1 2/3] drm/msm/dp: decoupling dp->id out of dp controller_id at scxxxx_dp_cfg table
On Sat, 25 Jun 2022 at 04:23, Abhinav Kumar <quic_abhinavk@quicinc.com> wrote:
> On 6/24/2022 5:11 PM, Dmitry Baryshkov wrote:
> > On Sat, 25 Jun 2022 at 03:03, Abhinav Kumar <quic_abhinavk@quicinc.com> wrote:
> >> On 6/24/2022 4:56 PM, Kuogee Hsieh wrote:
> >> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c
> >> b/drivers/gpu/drm/msm/dp/dp_display.c
> >> index dcd80c8a794c..7816e82452ca 100644
> >> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> >> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> >> @@ -140,8 +140,8 @@ static const struct msm_dp_config sc7180_dp_cfg = {
> >>
> >> static const struct msm_dp_config sc7280_dp_cfg = {
> >> .descs = (const struct msm_dp_desc[]) {
> >> - [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000,
> >> .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
> >> [MSM_DP_CONTROLLER_1] = { .io_start = 0x0aea0000,
> >> .connector_type = DRM_MODE_CONNECTOR_eDP, .wide_bus_en = true },
> >> + [MSM_DP_CONTROLLER_0] = { .io_start = 0x0ae90000,
> >> .connector_type = DRM_MODE_CONNECTOR_DisplayPort, .wide_bus_en = true },
> >> },
> >> .num_descs = 2,
> >> };
> >>
> >>
> >> The reason order is important is because in this function below, even
> >> though it matches the address to find which one to use it loops through
> >> the array and so the value of *id will change depending on which one is
> >> located where.
> >>
> >> static const struct msm_dp_desc *dp_display_get_desc(struct
> >> platform_device *pdev,
> >> unsigned int *id)
> >> {
> >> const struct msm_dp_config *cfg = of_device_get_match_data(&pdev->dev);
> >> struct resource *res;
> >> int i;
> >>
> >> res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> >> if (!res)
> >> return NULL;
> >>
> >> for (i = 0; i < cfg->num_descs; i++) {
> >> if (cfg->descs[i].io_start == res->start) {
> >> *id = i;
> >
> > The id is set to the index of the corresponding DP instance in the
> > descs array, which is MSM_DP_CONTROLLER_n. Correct up to now.
>
> Right, this is where I misunderstood his explanation.
>
> Even if we swap the order, but retain the index correctly it will still
> work today.
>
> Hes not sure of the root-cause of why turning on the primary display
> first fixes the issue.
>
> I think till we root-cause that, lets put this on hold.

Agreed. Let's find the root cause.


--
With best wishes
Dmitry

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