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

Laurent Pinchart
2017-04-04T11:20:47Z

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@synopsys.com>
> Reviewed-by: Archit Taneja <architt@codeaurora.org>
> Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>

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

> ---
> 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