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[PATCH v6 02/11] drm/mediatek: dp: Move AUX and panel poweron/off sequence to function

AngeloGioacchino Del Regno posted 11 patches 1 year, 3 months ago
There is a newer version of this series
[PATCH v6 02/11] drm/mediatek: dp: Move AUX and panel poweron/off sequence to function
Posted by AngeloGioacchino Del Regno 1 year, 3 months ago 
Everytime we run bridge detection and/or EDID read we run a poweron
and poweroff sequence for both the AUX and the panel; moreover, this
is also done when enabling the bridge in the .atomic_enable() callback.

Move this power on/off sequence to a new mtk_dp_aux_panel_poweron()
function as to commonize it.
Note that, before this commit, in mtk_dp_bridge_atomic_enable() only
the AUX was getting powered on but the panel was left powered off if
the DP cable wasn't plugged in while now we unconditionally send a D0
request and this is done for two reasons:
 - First, whether this request fails or not, it takes the same time
   and anyway the DP hardware won't produce any error (or, if it
   does, it's ignorable because it won't block further commands)
 - Second, training the link between a sleeping/standby/unpowered
   display makes little sense.

Signed-off-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
---
 drivers/gpu/drm/mediatek/mtk_dp.c | 76 ++++++++++++-------------------
 1 file changed, 30 insertions(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
index c58b775877a3..77da0d002e9f 100644
--- a/drivers/gpu/drm/mediatek/mtk_dp.c
+++ b/drivers/gpu/drm/mediatek/mtk_dp.c
@@ -1251,6 +1251,29 @@ static void mtk_dp_audio_mute(struct mtk_dp *mtk_dp, bool mute)
 			   val[2], AU_TS_CFG_DP_ENC0_P0_MASK);
 }
 
+static void mtk_dp_aux_panel_poweron(struct mtk_dp *mtk_dp, bool pwron)
+{
+	if (pwron) {
+		/* power on aux */
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
+				   DP_PWR_STATE_MASK);
+
+		/* power on panel */
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
+		usleep_range(2000, 5000);
+	} else {
+		/* power off panel */
+		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
+		usleep_range(2000, 3000);
+
+		/* power off aux */
+		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
+				   DP_PWR_STATE_BANDGAP_TPLL,
+				   DP_PWR_STATE_MASK);
+	}
+}
+
 static void mtk_dp_power_enable(struct mtk_dp *mtk_dp)
 {
 	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE,
@@ -1941,16 +1964,9 @@ static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
 	if (!mtk_dp->train_info.cable_plugged_in)
 		return ret;
 
-	if (!enabled) {
-		/* power on aux */
-		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
-				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
-				   DP_PWR_STATE_MASK);
+	if (!enabled)
+		mtk_dp_aux_panel_poweron(mtk_dp, true);
 
-		/* power on panel */
-		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
-		usleep_range(2000, 5000);
-	}
 	/*
 	 * Some dongles still source HPD when they do not connect to any
 	 * sink device. To avoid this, we need to read the sink count
@@ -1962,16 +1978,8 @@ static enum drm_connector_status mtk_dp_bdg_detect(struct drm_bridge *bridge)
 	if (DP_GET_SINK_COUNT(sink_count))
 		ret = connector_status_connected;
 
-	if (!enabled) {
-		/* power off panel */
-		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
-		usleep_range(2000, 3000);
-
-		/* power off aux */
-		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
-				   DP_PWR_STATE_BANDGAP_TPLL,
-				   DP_PWR_STATE_MASK);
-	}
+	if (!enabled)
+		mtk_dp_aux_panel_poweron(mtk_dp, false);
 
 	return ret;
 }
@@ -1987,15 +1995,7 @@ static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
 
 	if (!enabled) {
 		drm_atomic_bridge_chain_pre_enable(bridge, connector->state->state);
-
-		/* power on aux */
-		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
-				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
-				   DP_PWR_STATE_MASK);
-
-		/* power on panel */
-		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
-		usleep_range(2000, 5000);
+		mtk_dp_aux_panel_poweron(mtk_dp, true);
 	}
 
 	new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
@@ -2015,15 +2015,7 @@ static struct edid *mtk_dp_get_edid(struct drm_bridge *bridge,
 	}
 
 	if (!enabled) {
-		/* power off panel */
-		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D3);
-		usleep_range(2000, 3000);
-
-		/* power off aux */
-		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
-				   DP_PWR_STATE_BANDGAP_TPLL,
-				   DP_PWR_STATE_MASK);
-
+		mtk_dp_aux_panel_poweron(mtk_dp, false);
 		drm_atomic_bridge_chain_post_disable(bridge, connector->state->state);
 	}
 
@@ -2183,15 +2175,7 @@ static void mtk_dp_bridge_atomic_enable(struct drm_bridge *bridge,
 		return;
 	}
 
-	/* power on aux */
-	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
-			   DP_PWR_STATE_BANDGAP_TPLL_LANE,
-			   DP_PWR_STATE_MASK);
-
-	if (mtk_dp->train_info.cable_plugged_in) {
-		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER, DP_SET_POWER_D0);
-		usleep_range(2000, 5000);
-	}
+	mtk_dp_aux_panel_poweron(mtk_dp, true);
 
 	/* Training */
 	ret = mtk_dp_training(mtk_dp);
-- 
2.40.1
Re: [PATCH v6 02/11] drm/mediatek: dp: Move AUX and panel poweron/off sequence to function
Posted by Alexandre Mergnat 1 year, 3 months ago 
Reviewed-by: Alexandre Mergnat <amergnat@baylibre.com>

On 17/07/2023 16:14, AngeloGioacchino Del Regno wrote:
> Everytime we run bridge detection and/or EDID read we run a poweron
> and poweroff sequence for both the AUX and the panel; moreover, this
> is also done when enabling the bridge in the .atomic_enable() callback.
> 
> Move this power on/off sequence to a new mtk_dp_aux_panel_poweron()
> function as to commonize it.
> Note that, before this commit, in mtk_dp_bridge_atomic_enable() only
> the AUX was getting powered on but the panel was left powered off if
> the DP cable wasn't plugged in while now we unconditionally send a D0
> request and this is done for two reasons:
>   - First, whether this request fails or not, it takes the same time
>     and anyway the DP hardware won't produce any error (or, if it
>     does, it's ignorable because it won't block further commands)
>   - Second, training the link between a sleeping/standby/unpowered
>     display makes little sense.

-- 
Regards,
Alexandre
Re: [PATCH v6 02/11] drm/mediatek: dp: Move AUX and panel poweron/off sequence to function
Posted by CK Hu (胡俊光) 1 year, 3 months ago 
Hi, Angelo:

On Mon, 2023-07-17 at 16:14 +0200, AngeloGioacchino Del Regno wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  Everytime we run bridge detection and/or EDID read we run a poweron
> and poweroff sequence for both the AUX and the panel; moreover, this
> is also done when enabling the bridge in the .atomic_enable()
> callback.
> 
> Move this power on/off sequence to a new mtk_dp_aux_panel_poweron()
> function as to commonize it.
> Note that, before this commit, in mtk_dp_bridge_atomic_enable() only
> the AUX was getting powered on but the panel was left powered off if
> the DP cable wasn't plugged in while now we unconditionally send a D0
> request and this is done for two reasons:
>  - First, whether this request fails or not, it takes the same time
>    and anyway the DP hardware won't produce any error (or, if it
>    does, it's ignorable because it won't block further commands)
>  - Second, training the link between a sleeping/standby/unpowered
>    display makes little sense.

Reviewed-by: CK Hu <ck.hu@mediatek.com>

> 
> Signed-off-by: AngeloGioacchino Del Regno <
> angelogioacchino.delregno@collabora.com>
> Tested-by: Chen-Yu Tsai <wenst@chromium.org>
> ---
>  drivers/gpu/drm/mediatek/mtk_dp.c | 76 ++++++++++++-----------------
> --
>  1 file changed, 30 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c
> b/drivers/gpu/drm/mediatek/mtk_dp.c
> index c58b775877a3..77da0d002e9f 100644
> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
> @@ -1251,6 +1251,29 @@ static void mtk_dp_audio_mute(struct mtk_dp
> *mtk_dp, bool mute)
>  			   val[2], AU_TS_CFG_DP_ENC0_P0_MASK);
>  }
>  
> +static void mtk_dp_aux_panel_poweron(struct mtk_dp *mtk_dp, bool
> pwron)
> +{
> +	if (pwron) {
> +		/* power on aux */
> +		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> +				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
> +				   DP_PWR_STATE_MASK);
> +
> +		/* power on panel */
> +		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> +		usleep_range(2000, 5000);
> +	} else {
> +		/* power off panel */
> +		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D3);
> +		usleep_range(2000, 3000);
> +
> +		/* power off aux */
> +		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> +				   DP_PWR_STATE_BANDGAP_TPLL,
> +				   DP_PWR_STATE_MASK);
> +	}
> +}
> +
>  static void mtk_dp_power_enable(struct mtk_dp *mtk_dp)
>  {
>  	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_RESET_AND_PROBE,
> @@ -1941,16 +1964,9 @@ static enum drm_connector_status
> mtk_dp_bdg_detect(struct drm_bridge *bridge)
>  	if (!mtk_dp->train_info.cable_plugged_in)
>  		return ret;
>  
> -	if (!enabled) {
> -		/* power on aux */
> -		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> -				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
> -				   DP_PWR_STATE_MASK);
> +	if (!enabled)
> +		mtk_dp_aux_panel_poweron(mtk_dp, true);
>  
> -		/* power on panel */
> -		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> -		usleep_range(2000, 5000);
> -	}
>  	/*
>  	 * Some dongles still source HPD when they do not connect to
> any
>  	 * sink device. To avoid this, we need to read the sink count
> @@ -1962,16 +1978,8 @@ static enum drm_connector_status
> mtk_dp_bdg_detect(struct drm_bridge *bridge)
>  	if (DP_GET_SINK_COUNT(sink_count))
>  		ret = connector_status_connected;
>  
> -	if (!enabled) {
> -		/* power off panel */
> -		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D3);
> -		usleep_range(2000, 3000);
> -
> -		/* power off aux */
> -		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> -				   DP_PWR_STATE_BANDGAP_TPLL,
> -				   DP_PWR_STATE_MASK);
> -	}
> +	if (!enabled)
> +		mtk_dp_aux_panel_poweron(mtk_dp, false);
>  
>  	return ret;
>  }
> @@ -1987,15 +1995,7 @@ static struct edid *mtk_dp_get_edid(struct
> drm_bridge *bridge,
>  
>  	if (!enabled) {
>  		drm_atomic_bridge_chain_pre_enable(bridge, connector-
> >state->state);
> -
> -		/* power on aux */
> -		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> -				   DP_PWR_STATE_BANDGAP_TPLL_LANE,
> -				   DP_PWR_STATE_MASK);
> -
> -		/* power on panel */
> -		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> -		usleep_range(2000, 5000);
> +		mtk_dp_aux_panel_poweron(mtk_dp, true);
>  	}
>  
>  	new_edid = drm_get_edid(connector, &mtk_dp->aux.ddc);
> @@ -2015,15 +2015,7 @@ static struct edid *mtk_dp_get_edid(struct
> drm_bridge *bridge,
>  	}
>  
>  	if (!enabled) {
> -		/* power off panel */
> -		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D3);
> -		usleep_range(2000, 3000);
> -
> -		/* power off aux */
> -		mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> -				   DP_PWR_STATE_BANDGAP_TPLL,
> -				   DP_PWR_STATE_MASK);
> -
> +		mtk_dp_aux_panel_poweron(mtk_dp, false);
>  		drm_atomic_bridge_chain_post_disable(bridge, connector-
> >state->state);
>  	}
>  
> @@ -2183,15 +2175,7 @@ static void mtk_dp_bridge_atomic_enable(struct
> drm_bridge *bridge,
>  		return;
>  	}
>  
> -	/* power on aux */
> -	mtk_dp_update_bits(mtk_dp, MTK_DP_TOP_PWR_STATE,
> -			   DP_PWR_STATE_BANDGAP_TPLL_LANE,
> -			   DP_PWR_STATE_MASK);
> -
> -	if (mtk_dp->train_info.cable_plugged_in) {
> -		drm_dp_dpcd_writeb(&mtk_dp->aux, DP_SET_POWER,
> DP_SET_POWER_D0);
> -		usleep_range(2000, 5000);
> -	}
> +	mtk_dp_aux_panel_poweron(mtk_dp, true);
>  
>  	/* Training */
>  	ret = mtk_dp_training(mtk_dp);
> -- 
> 2.40.1

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