[PATCH v7 09/10] drm/vc4: hdmi: stop rereading EDID in get_modes()

Dmitry Baryshkov
2024-12-17T00:50:33Z

The vc4_hdmi_connector_detect_ctx() via vc4_hdmi_handle_hotplug()
already reads EDID and propagates it to the drm_connector. Stop
rereading EDID as a part of the .get_modes() callback and just update
the list of modes. This matches the behaviour of the i915 driver.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
---
drivers/gpu/drm/vc4/vc4_hdmi.c | 21 ---------------------
1 file changed, 21 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_hdmi.c b/drivers/gpu/drm/vc4/vc4_hdmi.c
index 2a2aca7017994779a7163935df3fc87ca312d6dd..bb5e8738845c74d975c1e0e1262ced46e4ef8fde 100644
--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -470,31 +470,10 @@ static int vc4_hdmi_connector_detect_ctx(struct drm_connector *connector,

static int vc4_hdmi_connector_get_modes(struct drm_connector *connector)
{
- struct vc4_hdmi *vc4_hdmi = connector_to_vc4_hdmi(connector);
struct vc4_dev *vc4 = to_vc4_dev(connector->dev);
- const struct drm_edid *drm_edid;
int ret = 0;

- /*
- * NOTE: This function should really take vc4_hdmi->mutex, but doing so
- * results in reentrancy issues since cec_s_phys_addr() might call
- * .adap_enable, which leads to that funtion being called with our mutex
- * held.
- *
- * Concurrency isn't an issue at the moment since we don't share
- * any state with any of the other frameworks so we can ignore
- * the lock for now.
- */
-
- drm_edid = drm_edid_read_ddc(connector, vc4_hdmi->ddc);
- drm_edid_connector_update(connector, drm_edid);
- cec_s_phys_addr(vc4_hdmi->cec_adap,
- connector->display_info.source_physical_address, false);
- if (!drm_edid)
- return 0;
-
ret = drm_edid_connector_add_modes(connector);
- drm_edid_free(drm_edid);

if (!vc4->hvs->vc5_hdmi_enable_hdmi_20) {
struct drm_device *drm = connector->dev;

--
2.39.5