[PATCH v2] drm/msm/dp: enable HDP plugin/unplugged interrupts at hpd_enable/disable
Dmitry Baryshkov
dmitry.baryshkov at linaro.org
Mon May 22 20:16:57 UTC 2023
On 22/05/2023 23:08, Kuogee Hsieh wrote:
> The internal_hpd flag was introduced to handle external DP HPD derived
> from GPIO pinmuxed into DP controller. HPD plug/unplug interrupts cannot
> be enabled until internal_hpd flag is set to true.
> At both bootup and resume time, the DP driver will enable external DP
> plugin interrupts and handle plugin interrupt accordingly.
> However
> dp_bridge_hpd_enable() bridge ops function was called to set internal_hpd
> to true later than where DP driver expected during both bootup and resume
> time.
Excuse me, can't parse this.
> This prevent DP driver from detecting external plugin interrupt due
> to HPD related interrupts are not enabled on time. Hence external display
prevents
not being enabled
> can not be lit up properly.
>
> Move HPD related interrupts control of both enable/disable HDP hardware
> block and setup individual interrupt mask bits to dp_bridge_hpd_enable()
> and dp_bridge_hpd_disable().
>
> Fixes: cd198caddea7 ("drm/msm/dp: Rely on hpd_enable/disable callbacks")
> Signed-off-by: Kuogee Hsieh <quic_khsieh at quicinc.com>
This looks pretty good to me, minor nit below.
> ---
> drivers/gpu/drm/msm/dp/dp_catalog.c | 19 ++++++----
> drivers/gpu/drm/msm/dp/dp_catalog.h | 2 +-
> drivers/gpu/drm/msm/dp/dp_display.c | 70 +++++++++++--------------------------
> 3 files changed, 35 insertions(+), 56 deletions(-)
>
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
> index 7a8cf1c..1da711e 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
> @@ -620,19 +620,26 @@ void dp_catalog_hpd_config_intr(struct dp_catalog *dp_catalog,
> config & DP_DP_HPD_INT_MASK);
> }
>
> -void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog)
> +void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog, bool enable)
Could you please split it into _enable and _disable functions? Having
dp_catalog_ctrl_hpd_config(.., false) doesn't sound logical.
> {
> struct dp_catalog_private *catalog = container_of(dp_catalog,
> struct dp_catalog_private, dp_catalog);
>
> u32 reftimer = dp_read_aux(catalog, REG_DP_DP_HPD_REFTIMER);
>
> - /* Configure REFTIMER and enable it */
> - reftimer |= DP_DP_HPD_REFTIMER_ENABLE;
> - dp_write_aux(catalog, REG_DP_DP_HPD_REFTIMER, reftimer);
> + if (enable) {
> + /* Configure REFTIMER and enable it */
> + reftimer |= DP_DP_HPD_REFTIMER_ENABLE;
> + dp_write_aux(catalog, REG_DP_DP_HPD_REFTIMER, reftimer);
> +
> + /* Enable HPD */
> + dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, DP_DP_HPD_CTRL_HPD_EN);
> + } else {
> + reftimer &= ~DP_DP_HPD_REFTIMER_ENABLE;
> + dp_write_aux(catalog, REG_DP_DP_HPD_REFTIMER, reftimer);
>
> - /* Enable HPD */
> - dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, DP_DP_HPD_CTRL_HPD_EN);
> + dp_write_aux(catalog, REG_DP_DP_HPD_CTRL, 0);
> + }
> }
>
> static void dp_catalog_enable_sdp(struct dp_catalog_private *catalog)
> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
> index 82376a2..818c036 100644
> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
> @@ -104,7 +104,7 @@ bool dp_catalog_ctrl_mainlink_ready(struct dp_catalog *dp_catalog);
> void dp_catalog_ctrl_enable_irq(struct dp_catalog *dp_catalog, bool enable);
> void dp_catalog_hpd_config_intr(struct dp_catalog *dp_catalog,
> u32 intr_mask, bool en);
> -void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog);
> +void dp_catalog_ctrl_hpd_config(struct dp_catalog *dp_catalog, bool enable);
> void dp_catalog_ctrl_config_psr(struct dp_catalog *dp_catalog);
> void dp_catalog_ctrl_set_psr(struct dp_catalog *dp_catalog, bool enter);
> u32 dp_catalog_link_is_connected(struct dp_catalog *dp_catalog);
> diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
> index 3e13acdf..fee23e5 100644
> --- a/drivers/gpu/drm/msm/dp/dp_display.c
> +++ b/drivers/gpu/drm/msm/dp/dp_display.c
> @@ -615,12 +615,6 @@ static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
> dp->hpd_state = ST_MAINLINK_READY;
> }
>
> - /* enable HDP irq_hpd/replug interrupt */
> - 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);
> mutex_unlock(&dp->event_mutex);
> @@ -658,12 +652,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
> drm_dbg_dp(dp->drm_dev, "Before, type=%d hpd_state=%d\n",
> dp->dp_display.connector_type, state);
>
> - /* disable irq_hpd/replug interrupts */
> - 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);
>
> @@ -687,10 +675,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
> return 0;
> }
>
> - /* disable HPD plug interrupts */
> - 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
> * connect/attention interrupts are disabled
> @@ -706,10 +690,6 @@ static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
> /* signal the disconnect event early to ensure proper teardown */
> dp_display_handle_plugged_change(&dp->dp_display, false);
>
> - /* enable HDP plug interrupt to prepare for next plugin */
> - 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",
> dp->dp_display.connector_type, state);
>
> @@ -1082,26 +1062,6 @@ void msm_dp_snapshot(struct msm_disp_state *disp_state, struct msm_dp *dp)
> mutex_unlock(&dp_display->event_mutex);
> }
>
> -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 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,
> - true);
> -
> - /* Enable interrupt first time
> - * we are leaving dp clocks on during disconnect
> - * and never disable interrupt
> - */
> - enable_irq(dp->irq);
> -}
> -
> void dp_display_set_psr(struct msm_dp *dp_display, bool enter)
> {
> struct dp_display_private *dp;
> @@ -1176,7 +1136,7 @@ static int hpd_event_thread(void *data)
>
> switch (todo->event_id) {
> case EV_HPD_INIT_SETUP:
> - dp_display_config_hpd(dp_priv);
> + dp_display_host_init(dp_priv);
> break;
> case EV_HPD_PLUG_INT:
> dp_hpd_plug_handle(dp_priv, todo->data);
> @@ -1394,13 +1354,8 @@ static int dp_pm_resume(struct device *dev)
> /* turn on dp ctrl/phy */
> dp_display_host_init(dp);
>
> - dp_catalog_ctrl_hpd_config(dp->catalog);
> -
> - 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,
> - true);
> + if (dp_display->is_edp)
> + dp_catalog_ctrl_hpd_config(dp->catalog, true);
>
> if (dp_catalog_link_is_connected(dp->catalog)) {
> /*
> @@ -1568,7 +1523,7 @@ static int dp_display_get_next_bridge(struct msm_dp *dp)
>
> if (aux_bus && dp->is_edp) {
> dp_display_host_init(dp_priv);
> - dp_catalog_ctrl_hpd_config(dp_priv->catalog);
> + dp_catalog_ctrl_hpd_config(dp_priv->catalog, true);
> dp_display_host_phy_init(dp_priv);
> enable_irq(dp_priv->irq);
>
> @@ -1801,16 +1756,33 @@ 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;
> + struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
> +
> + mutex_lock(&dp->event_mutex);
> + dp_catalog_ctrl_hpd_config(dp->catalog, true);
> +
> + /* enable HDP interrupts */
> + dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, true);
> +
> + enable_irq(dp->irq);
>
> dp_display->internal_hpd = true;
> + mutex_unlock(&dp->event_mutex);
> }
>
> 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;
> + struct dp_display_private *dp = container_of(dp_display, struct dp_display_private, dp_display);
> +
> + mutex_lock(&dp->event_mutex);
> + /* disable HDP interrupts */
> + dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_INT_MASK, false);
> + dp_catalog_ctrl_hpd_config(dp->catalog, false);
>
> dp_display->internal_hpd = false;
> + mutex_unlock(&dp->event_mutex);
> }
>
> void dp_bridge_hpd_notify(struct drm_bridge *bridge,
--
With best wishes
Dmitry
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