diff mbox series

[v2,05/15] drm/vc4: hdmi: Restore cec physical address on reconnect

Message ID 20210111142309.193441-6-maxime@cerno.tech
State Accepted
Commit b06eecb5158e5f3eb47b9d05aea8c259985cc5f7
Headers show
Series drm/vc4: hdmi: Add CEC support for the BCM2711 | expand

Commit Message

Maxime Ripard Jan. 11, 2021, 2:22 p.m. UTC 
From: Dom Cobley <popcornmix@gmail.com>

Currently we call cec_phys_addr_invalidate on a hotplug deassert.
That may be due to a TV power cycling, or an AVR being switched
on (and switching edid).

This makes CEC unusable since our controller wouldn't have a physical
address anymore.

Set it back up again on the hotplug assert.

Fixes: 15b4511a4af6 ("drm/vc4: add HDMI CEC support")
Signed-off-by: Dom Cobley <popcornmix@gmail.com>
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 24 ++++++++++++++++++------
 1 file changed, 18 insertions(+), 6 deletions(-)

Comments

Dave Stevenson Jan. 22, 2021, 10:31 a.m. UTC | #1 
Hi Maxime

Sorry for the slow reply on these patches.

On Mon, 11 Jan 2021 at 14:23, Maxime Ripard <maxime@cerno.tech> wrote:
>
> From: Dom Cobley <popcornmix@gmail.com>
>
> Currently we call cec_phys_addr_invalidate on a hotplug deassert.
> That may be due to a TV power cycling, or an AVR being switched
> on (and switching edid).
>
> This makes CEC unusable since our controller wouldn't have a physical
> address anymore.
>
> Set it back up again on the hotplug assert.
>
> Fixes: 15b4511a4af6 ("drm/vc4: add HDMI CEC support")
> Signed-off-by: Dom Cobley <popcornmix@gmail.com>
> Signed-off-by: Maxime Ripard <maxime@cerno.tech>

I follow the logic, and trust Dom that it works, but I don't know if
that is the correct thing within CEC.
Ideally Hans will comment as the original author of the CEC code - I
believe he's testing the series anyway.

Acked-by: Dave Stevenson <dave.stevenson@raspberrypi.com>

> ---
>  drivers/gpu/drm/vc4/vc4_hdmi.c | 24 ++++++++++++++++++------
>  1 file changed, 18 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
> index 7945dbcee78c..c3a301396aad 100644
> --- a/drivers/gpu/drm/vc4/vc4_hdmi.c
> +++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
> @@ -136,20 +136,32 @@ static enum drm_connector_status
>  vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
>  {
>         struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
> +       bool connected = false;
>
>         if (vc4_hdmi->hpd_gpio) {
>                 if (gpio_get_value_cansleep(vc4_hdmi->hpd_gpio) ^
>                     vc4_hdmi->hpd_active_low)
> -                       return connector_status_connected;
> -               cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
> -               return connector_status_disconnected;
> +                       connected = true;
> +       } else if (drm_probe_ddc(vc4_hdmi->ddc)) {
> +               connected = true;
> +       } else if (HDMI_READ(HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED) {
> +               connected = true;
>         }
>
> -       if (drm_probe_ddc(vc4_hdmi->ddc))
> -               return connector_status_connected;
> +       if (connected) {
> +               if (connector->status != connector_status_connected) {
> +                       struct edid *edid = drm_get_edid(connector, vc4_hdmi->ddc);
> +
> +                       if (edid) {
> +                               cec_s_phys_addr_from_edid(vc4_hdmi->cec_adap, edid);
> +                               vc4_hdmi->encoder.hdmi_monitor = drm_detect_hdmi_monitor(edid);
> +                               kfree(edid);
> +                       }
> +               }
>
> -       if (HDMI_READ(HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED)
>                 return connector_status_connected;
> +       }
> +
>         cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
>         return connector_status_disconnected;
>  }
> --
> 2.29.2
>
diff mbox series

Patch

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 7945dbcee78c..c3a301396aad 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -136,20 +136,32 @@  static enum drm_connector_status
 vc4_hdmi_connector_detect(struct drm_connector *connector, bool force)
 {
 	struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
+	bool connected = false;
 
 	if (vc4_hdmi->hpd_gpio) {
 		if (gpio_get_value_cansleep(vc4_hdmi->hpd_gpio) ^
 		    vc4_hdmi->hpd_active_low)
-			return connector_status_connected;
-		cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
-		return connector_status_disconnected;
+			connected = true;
+	} else if (drm_probe_ddc(vc4_hdmi->ddc)) {
+		connected = true;
+	} else if (HDMI_READ(HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED) {
+		connected = true;
 	}
 
-	if (drm_probe_ddc(vc4_hdmi->ddc))
-		return connector_status_connected;
+	if (connected) {
+		if (connector->status != connector_status_connected) {
+			struct edid *edid = drm_get_edid(connector, vc4_hdmi->ddc);
+
+			if (edid) {
+				cec_s_phys_addr_from_edid(vc4_hdmi->cec_adap, edid);
+				vc4_hdmi->encoder.hdmi_monitor = drm_detect_hdmi_monitor(edid);
+				kfree(edid);
+			}
+		}
 
-	if (HDMI_READ(HDMI_HOTPLUG) & VC4_HDMI_HOTPLUG_CONNECTED)
 		return connector_status_connected;
+	}
+
 	cec_phys_addr_invalidate(vc4_hdmi->cec_adap);
 	return connector_status_disconnected;
 }