Re: [PATCH v5 08/12] drm/msm/dp: Rely on hpd_enable/disable callbacks

Kuogee Hsieh
2022-12-08T23:15:09Z

On 12/7/2022 2:00 PM, Bjorn Andersson wrote:
> From: Bjorn Andersson <bjorn.andersson@linaro.org>
>
> The DisplayPort controller's internal HPD interrupt handling is used for
> cases where the HPD signal is connected to a GPIO which is pinmuxed into
> the DisplayPort controller. In other configurations the HPD notification
> might be delivered by the DRM framework from an associated bridge.
>
> This difference is not appropriately represented by the "is_edp"
> boolean, but is properly represented by the frameworks invocation of the
> hpd_enable() and hpd_disable() callbacks. Switch the current condition
> to rely on these callbacks instead.
>
> This ensures appropriate handling of the three cases; no bridge
> connected, a bridge without DRM_BRIDGE_OP_HPD and a bridge with
> DRM_BRIDGE_OP_HPD.
>
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> Signed-off-by: Bjorn Andersson <quic_bjorande@quicinc.com>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Kuogee Hsieh <quic_khsieh@quicinc.com>
> ---
>
> Changes since v4:
> - Reordered the hpd_enable/disable patch earlier
> - Squashed in internal_hpd conditional changes into the same patch
>
> drivers/gpu/drm/msm/dp/dp_display.c | 40 +++++++++++++++++++++--------
> drivers/gpu/drm/msm/dp/dp_display.h | 1 +
> drivers/gpu/drm/msm/dp/dp_drm.c | 2 ++
> drivers/gpu/drm/msm/dp/dp_drm.h | 2 ++
> 4 files changed, 35 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 666b45c8ab80..095adf528e43 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -610,8 +610,10 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
> }
>
> /* enable HDP irq_hpd/replug interrupt */
> - dp_catalog_hpd_config_intr(dp->catalog,
> - DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, true);
> + if (dp->dp_display.internal_hpd)
> + dp_catalog_hpd_config_intr(dp->catalog,
> + DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK,
> + true);
>
> drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
> dp->dp_display.connector_type, state);
> @@ -651,8 +653,10 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
> dp->dp_display.connector_type, state);
>
> /* disable irq_hpd/replug interrupts */
> - dp_catalog_hpd_config_intr(dp->catalog,
> - DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK, false);
> + if (dp->dp_display.internal_hpd)
> + dp_catalog_hpd_config_intr(dp->catalog,
> + DP_DP_IRQ_HPD_INT_MASK | DP_DP_HPD_REPLUG_INT_MASK,
> + false);
>
> /* unplugged, no more irq_hpd handle */
> dp_del_event(dp, EV_IRQ_HPD_INT);
> @@ -678,7 +682,8 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
> }
>
> /* disable HPD plug interrupts */
> - dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, false);
> + if (dp->dp_display.internal_hpd)
> + dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, false);
>
> /*
> * We don't need separate work for disconnect as
> @@ -696,7 +701,7 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
> dp_display_handle_plugged_change(&dp->dp_display, false);
>
> /* enable HDP plug interrupt to prepare for next plugin */
> - if (!dp->dp_display.is_edp)
> + if (dp->dp_display.internal_hpd)
> dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK, true);
>
> drm_dbg_dp(dp->drm_dev, "After, type=%d hpd_state=%d\n",
> @@ -1081,8 +1086,8 @@ static void dp_display_config_hpd(struct dp_display_private *dp)
> dp_display_host_init(dp);
> dp_catalog_ctrl_hpd_config(dp->catalog);
>
> - /* Enable plug and unplug interrupts only for external DisplayPort */
> - if (!dp->dp_display.is_edp)
> + /* Enable plug and unplug interrupts only if requested */
> + if (dp->dp_display.internal_hpd)
> dp_catalog_hpd_config_intr(dp->catalog,
> DP_DP_HPD_PLUG_INT_MASK |
> DP_DP_HPD_UNPLUG_INT_MASK,
> @@ -1374,8 +1379,7 @@ static int dp_pm_resume(struct device *dev)
>
> dp_catalog_ctrl_hpd_config(dp->catalog);
>
> -
> - if (!dp->dp_display.is_edp)
> + if (dp->dp_display.internal_hpd)
> dp_catalog_hpd_config_intr(dp->catalog,
> DP_DP_HPD_PLUG_INT_MASK |
> DP_DP_HPD_UNPLUG_INT_MASK,
> @@ -1772,3 +1776,19 @@ void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
> dp_display->dp_mode.h_active_low =
> !!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
> }
> +
> +void dp_bridge_hpd_enable(struct drm_bridge *bridge)
> +{
> + struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + dp_display->internal_hpd = true;
> +}
> +
> +void dp_bridge_hpd_disable(struct drm_bridge *bridge)
> +{
> + struct msm_dp_bridge *dp_bridge = to_dp_bridge(bridge);
> + struct msm_dp *dp_display = dp_bridge->dp_display;
> +
> + dp_display->internal_hpd = false;
> +}
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.h b/drivers/gpu/drm/msm/dp/dp_display.h
> index dcedf021f7fe..371337d0fae2 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.h
> +++ b/drivers/gpu/drm/msm/dp/dp_display.h
> @@ -21,6 +21,7 @@ struct msm_dp {
> bool power_on;
> unsigned int connector_type;
> bool is_edp;
> + bool internal_hpd;
>
> hdmi_codec_plugged_cb plugged_cb;
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
> index 6db82f9b03af..9d03b6ee3c41 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.c
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.c
> @@ -102,6 +102,8 @@ static const struct drm_bridge_funcs dp_bridge_ops = {
> .get_modes = dp_bridge_get_modes,
> .detect = dp_bridge_detect,
> .atomic_check = dp_bridge_atomic_check,
> + .hpd_enable = dp_bridge_hpd_enable,
> + .hpd_disable = dp_bridge_hpd_disable,
> };
>
> struct drm_bridge *dp_bridge_init(struct msm_dp *dp_display, struct drm_device *dev,
> diff --git a/drivers/gpu/drm/msm/dp/dp_drm.h b/drivers/gpu/drm/msm/dp/dp_drm.h
> index 82035dbb0578..1f871b555006 100644
> --- a/drivers/gpu/drm/msm/dp/dp_drm.h
> +++ b/drivers/gpu/drm/msm/dp/dp_drm.h
> @@ -32,5 +32,7 @@ enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
> void dp_bridge_mode_set(struct drm_bridge *drm_bridge,
> const struct drm_display_mode *mode,
> const struct drm_display_mode *adjusted_mode);
> +void dp_bridge_hpd_enable(struct drm_bridge *bridge);
> +void dp_bridge_hpd_disable(struct drm_bridge *bridge);
>
> #endif /* _DP_DRM_H_ */