Re: [PATCH v6 6/6] drm: bridge: dw-hdmi: Move HPD handling to PHY operations

[Laurent Pinchart]

Hi Neil,

Thank you for the patch.

On Monday 03 Apr 2017 16:42:38 Neil Armstrong wrote:
> The HDMI TX controller support HPD and RXSENSE signaling from the PHY
> via it's STAT0 PHY interface, but some vendor PHYs can manage these
> signals independently from the controller, thus these STAT0 handling
> should be moved to PHY specific operations and become optional.
> 
> The existing STAT0 HPD and RXSENSE handling code is refactored into
> a supplementaty set of default PHY operations that are used automatically
> when the platform glue doesn't provide its own operations.
> 
> Reviewed-by: Jose Abreu <joabreu@xxxxxxxxxxxx>
> Reviewed-by: Archit Taneja <architt@xxxxxxxxxxxxxx>
> Signed-off-by: Neil Armstrong <narmstrong@xxxxxxxxxxxx>

Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>

> ---
>  drivers/gpu/drm/bridge/synopsys/dw-hdmi.c | 135 +++++++++++++++------------
>  include/drm/bridge/dw_hdmi.h              |   5 ++
>  2 files changed, 86 insertions(+), 54 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c index 16d5fff3..84cc949 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
> @@ -1229,10 +1229,46 @@ static enum drm_connector_status
> dw_hdmi_phy_read_hpd(struct dw_hdmi *hdmi, connector_status_connected :
> connector_status_disconnected;
>  }
> 
> +static void dw_hdmi_phy_update_hpd(struct dw_hdmi *hdmi, void *data,
> +				   bool force, bool disabled, bool rxsense)
> +{
> +	u8 old_mask = hdmi->phy_mask;
> +
> +	if (force || disabled || !rxsense)
> +		hdmi->phy_mask |= HDMI_PHY_RX_SENSE;
> +	else
> +		hdmi->phy_mask &= ~HDMI_PHY_RX_SENSE;
> +
> +	if (old_mask != hdmi->phy_mask)
> +		hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
> +}
> +
> +static void dw_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi, void *data)
> +{
> +	/*
> +	 * Configure the PHY RX SENSE and HPD interrupts polarities and clear
> +	 * any pending interrupt.
> +	 */
> +	hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);
> +	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> +		    HDMI_IH_PHY_STAT0);
> +
> +	/* Enable cable hot plug irq. */
> +	hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
> +
> +	/* Clear and unmute interrupts. */
> +	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> +		    HDMI_IH_PHY_STAT0);
> +	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | 
HDMI_IH_PHY_STAT0_RX_SENSE),
> +		    HDMI_IH_MUTE_PHY_STAT0);
> +}
> +
>  static const struct dw_hdmi_phy_ops dw_hdmi_synopsys_phy_ops = {
>  	.init = dw_hdmi_phy_init,
>  	.disable = dw_hdmi_phy_disable,
>  	.read_hpd = dw_hdmi_phy_read_hpd,
> +	.update_hpd = dw_hdmi_phy_update_hpd,
> +	.setup_hpd = dw_hdmi_phy_setup_hpd,
>  };
> 
>  /* ------------------------------------------------------------------------
> @@ -1808,35 +1844,10 @@ static void dw_hdmi_update_power(struct dw_hdmi
> *hdmi) */
>  static void dw_hdmi_update_phy_mask(struct dw_hdmi *hdmi)
>  {
> -	u8 old_mask = hdmi->phy_mask;
> -
> -	if (hdmi->force || hdmi->disabled || !hdmi->rxsense)
> -		hdmi->phy_mask |= HDMI_PHY_RX_SENSE;
> -	else
> -		hdmi->phy_mask &= ~HDMI_PHY_RX_SENSE;
> -
> -	if (old_mask != hdmi->phy_mask)
> -		hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
> -}
> -
> -static void dw_hdmi_phy_setup_hpd(struct dw_hdmi *hdmi)
> -{
> -	/*
> -	 * Configure the PHY RX SENSE and HPD interrupts polarities and clear
> -	 * any pending interrupt.
> -	 */
> -	hdmi_writeb(hdmi, HDMI_PHY_HPD | HDMI_PHY_RX_SENSE, HDMI_PHY_POL0);
> -	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> -		    HDMI_IH_PHY_STAT0);
> -
> -	/* Enable cable hot plug irq. */
> -	hdmi_writeb(hdmi, hdmi->phy_mask, HDMI_PHY_MASK0);
> -
> -	/* Clear and unmute interrupts. */
> -	hdmi_writeb(hdmi, HDMI_IH_PHY_STAT0_HPD | HDMI_IH_PHY_STAT0_RX_SENSE,
> -		    HDMI_IH_PHY_STAT0);
> -	hdmi_writeb(hdmi, ~(HDMI_IH_PHY_STAT0_HPD | 
HDMI_IH_PHY_STAT0_RX_SENSE),
> -		    HDMI_IH_MUTE_PHY_STAT0);
> +	if (hdmi->phy.ops->update_hpd)
> +		hdmi->phy.ops->update_hpd(hdmi, hdmi->phy.data,
> +					  hdmi->force, hdmi->disabled,
> +					  hdmi->rxsense);
>  }
> 
>  static enum drm_connector_status
> @@ -2028,6 +2039,41 @@ static irqreturn_t dw_hdmi_hardirq(int irq, void
> *dev_id) return ret;
>  }
> 
> +void __dw_hdmi_setup_rx_sense(struct dw_hdmi *hdmi, bool hpd, bool
> rx_sense) +{
> +	mutex_lock(&hdmi->mutex);
> +
> +	if (!hdmi->force) {
> +		/*
> +		 * If the RX sense status indicates we're disconnected,
> +		 * clear the software rxsense status.
> +		 */
> +		if (!rx_sense)
> +			hdmi->rxsense = false;
> +
> +		/*
> +		 * Only set the software rxsense status when both
> +		 * rxsense and hpd indicates we're connected.
> +		 * This avoids what seems to be bad behaviour in
> +		 * at least iMX6S versions of the phy.
> +		 */
> +		if (hpd)
> +			hdmi->rxsense = true;
> +
> +		dw_hdmi_update_power(hdmi);
> +		dw_hdmi_update_phy_mask(hdmi);
> +	}
> +	mutex_unlock(&hdmi->mutex);
> +}
> +
> +void dw_hdmi_setup_rx_sense(struct device *dev, bool hpd, bool rx_sense)
> +{
> +	struct dw_hdmi *hdmi = dev_get_drvdata(dev);
> +
> +	__dw_hdmi_setup_rx_sense(hdmi, hpd, rx_sense);
> +}
> +EXPORT_SYMBOL_GPL(dw_hdmi_setup_rx_sense);
> +
>  static irqreturn_t dw_hdmi_irq(int irq, void *dev_id)
>  {
>  	struct dw_hdmi *hdmi = dev_id;
> @@ -2060,30 +2106,10 @@ static irqreturn_t dw_hdmi_irq(int irq, void
> *dev_id) * ask the source to re-read the EDID.
>  	 */
>  	if (intr_stat &
> -	    (HDMI_IH_PHY_STAT0_RX_SENSE | HDMI_IH_PHY_STAT0_HPD)) {
> -		mutex_lock(&hdmi->mutex);
> -		if (!hdmi->force) {
> -			/*
> -			 * If the RX sense status indicates we're 
disconnected,
> -			 * clear the software rxsense status.
> -			 */
> -			if (!(phy_stat & HDMI_PHY_RX_SENSE))
> -				hdmi->rxsense = false;
> -
> -			/*
> -			 * Only set the software rxsense status when both
> -			 * rxsense and hpd indicates we're connected.
> -			 * This avoids what seems to be bad behaviour in
> -			 * at least iMX6S versions of the phy.
> -			 */
> -			if (phy_stat & HDMI_PHY_HPD)
> -				hdmi->rxsense = true;
> -
> -			dw_hdmi_update_power(hdmi);
> -			dw_hdmi_update_phy_mask(hdmi);
> -		}
> -		mutex_unlock(&hdmi->mutex);
> -	}
> +	    (HDMI_IH_PHY_STAT0_RX_SENSE | HDMI_IH_PHY_STAT0_HPD))
> +		__dw_hdmi_setup_rx_sense(hdmi,
> +					 phy_stat & HDMI_PHY_HPD,
> +					 phy_stat & HDMI_PHY_RX_SENSE);
> 
>  	if (intr_stat & HDMI_IH_PHY_STAT0_HPD) {
>  		dev_dbg(hdmi->dev, "EVENT=%s\n",
> @@ -2357,7 +2383,8 @@ static int dw_hdmi_detect_phy(struct dw_hdmi *hdmi)
>  #endif
> 
>  	dw_hdmi_setup_i2c(hdmi);
> -	dw_hdmi_phy_setup_hpd(hdmi);
> +	if (hdmi->phy.ops->setup_hpd)
> +		hdmi->phy.ops->setup_hpd(hdmi, hdmi->phy.data);
> 
>  	memset(&pdevinfo, 0, sizeof(pdevinfo));
>  	pdevinfo.parent = dev;
> diff --git a/include/drm/bridge/dw_hdmi.h b/include/drm/bridge/dw_hdmi.h
> index 45c2c15..e63d675 100644
> --- a/include/drm/bridge/dw_hdmi.h
> +++ b/include/drm/bridge/dw_hdmi.h
> @@ -117,6 +117,9 @@ struct dw_hdmi_phy_ops {
>  		    struct drm_display_mode *mode);
>  	void (*disable)(struct dw_hdmi *hdmi, void *data);
>  	enum drm_connector_status (*read_hpd)(struct dw_hdmi *hdmi, void 
*data);
> +	void (*update_hpd)(struct dw_hdmi *hdmi, void *data,
> +			   bool force, bool disabled, bool rxsense);
> +	void (*setup_hpd)(struct dw_hdmi *hdmi, void *data);
>  };
> 
>  struct dw_hdmi_plat_data {
> @@ -147,6 +150,8 @@ int dw_hdmi_probe(struct platform_device *pdev,
>  int dw_hdmi_bind(struct platform_device *pdev, struct drm_encoder *encoder,
> const struct dw_hdmi_plat_data *plat_data);
> 
> +void dw_hdmi_setup_rx_sense(struct device *dev, bool hpd, bool rx_sense);
> +
>  void dw_hdmi_set_sample_rate(struct dw_hdmi *hdmi, unsigned int rate);
>  void dw_hdmi_audio_enable(struct dw_hdmi *hdmi);
>  void dw_hdmi_audio_disable(struct dw_hdmi *hdmi);

-- 
Regards,

Laurent Pinchart