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Subject[PATCH 3/3 v3] drm: bridge/dw-hdmi: Move edid reading to .detect() callback
Date
When running HDMI compliance tests we noticed that sometimes
the edid changes but the get_modes() function is not called
so the edid is not updated. Moving the edid reading to the
detect() callback ensures that the edid is correctly updated
after an hotplug.

Signed-off-by: Jose Abreu <joabreu@synopsys.com>
Cc: Carlos Palminha <palminha@synopsys.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Russell King <rmk+kernel@arm.linux.org.uk>
Cc: Fabio Estevam <fabio.estevam@freescale.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Takashi Iwai <tiwai@suse.de>
Cc: Vladimir Zapolskiy <vladimir_zapolskiy@mentor.com>
Cc: Thierry Reding <treding@nvidia.com>
Cc: dri-devel@lists.freedesktop.org
Cc: linux-kernel@vger.kernel.org
---

This patch was only introduced in v3.

drivers/gpu/drm/bridge/dw-hdmi.c | 67 +++++++++++++++++++++++-----------------
1 file changed, 38 insertions(+), 29 deletions(-)

diff --git a/drivers/gpu/drm/bridge/dw-hdmi.c b/drivers/gpu/drm/bridge/dw-hdmi.c
index 9122a20..c795888 100644
--- a/drivers/gpu/drm/bridge/dw-hdmi.c
+++ b/drivers/gpu/drm/bridge/dw-hdmi.c
@@ -31,8 +31,6 @@
#include "dw-hdmi.h"
#include "dw-hdmi-audio.h"

-#define HDMI_EDID_LEN 512
-
#define RGB 0
#define YCBCR444 1
#define YCBCR422_16BITS 2
@@ -117,7 +115,7 @@ struct dw_hdmi {

int vic;

- u8 edid[HDMI_EDID_LEN];
+ struct edid *edid;
bool cable_plugin;

bool phy_enabled;
@@ -1457,6 +1455,7 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
{
struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
connector);
+ bool connected;

mutex_lock(&hdmi->mutex);
hdmi->force = DRM_FORCE_UNSPECIFIED;
@@ -1464,7 +1463,40 @@ dw_hdmi_connector_detect(struct drm_connector *connector, bool force)
dw_hdmi_update_phy_mask(hdmi);
mutex_unlock(&hdmi->mutex);

- return hdmi_readb(hdmi, HDMI_PHY_STAT0) & HDMI_PHY_HPD ?
+ connected = hdmi_readb(hdmi, HDMI_PHY_STAT0) & HDMI_PHY_HPD;
+
+ if (connected && hdmi->ddc) {
+ if (hdmi->edid) {
+ drm_mode_connector_update_edid_property(connector,
+ NULL);
+ kfree(hdmi->edid);
+ hdmi->edid = NULL;
+ }
+
+ hdmi->edid = drm_get_edid(connector, hdmi->ddc);
+ if (hdmi->edid) {
+ dev_dbg(hdmi->dev, "got edid: width[%d] x height[%d]\n",
+ hdmi->edid->width_cm,
+ hdmi->edid->height_cm);
+ drm_mode_connector_update_edid_property(connector,
+ hdmi->edid);
+ drm_edid_to_eld(connector, hdmi->edid);
+
+ hdmi->sink_is_hdmi =
+ drm_detect_hdmi_monitor(hdmi->edid);
+ hdmi->sink_has_audio =
+ drm_detect_monitor_audio(hdmi->edid);
+ hdmi->sink_supports_ai =
+ connector->eld[5] & (0x1 << 1);
+ } else {
+ dev_dbg(hdmi->dev, "failed to get edid\n");
+ hdmi->sink_is_hdmi = false;
+ hdmi->sink_has_audio = false;
+ hdmi->sink_supports_ai = false;
+ }
+ }
+
+ return connected ?
connector_status_connected : connector_status_disconnected;
}

@@ -1472,33 +1504,10 @@ static int dw_hdmi_connector_get_modes(struct drm_connector *connector)
{
struct dw_hdmi *hdmi = container_of(connector, struct dw_hdmi,
connector);
- struct edid *edid;
int ret = 0;

- if (!hdmi->ddc)
- return 0;
-
- edid = drm_get_edid(connector, hdmi->ddc);
- if (edid) {
- dev_dbg(hdmi->dev, "got edid: width[%d] x height[%d]\n",
- edid->width_cm, edid->height_cm);
-
- hdmi->sink_is_hdmi = drm_detect_hdmi_monitor(edid);
- hdmi->sink_has_audio = drm_detect_monitor_audio(edid);
- drm_mode_connector_update_edid_property(connector, edid);
- ret = drm_add_edid_modes(connector, edid);
- /* Store the ELD */
- drm_edid_to_eld(connector, edid);
- kfree(edid);
-
- hdmi->sink_supports_ai = connector->eld[5] & (0x1 << 1);
- } else {
- dev_dbg(hdmi->dev, "failed to get edid\n");
- hdmi->sink_is_hdmi = false;
- hdmi->sink_has_audio = false;
- hdmi->sink_supports_ai = false;
- }
-
+ if (hdmi->edid)
+ ret = drm_add_edid_modes(connector, hdmi->edid);
return ret;
}

--
2.1.4
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