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drm/connector: hdmi: Add custom hook to filter TMDS character rate

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Most of the HDMI controllers have an upper TMDS character rate limit
they can't exceed. On "embedded"-grade display controllers, it will
typically be lower than what high-grade monitors can provide these days,
so drivers will filter the TMDS character rate based on the controller
capabilities.

To make that easier to handle for drivers, let's provide an optional
hook to be implemented by drivers so they can tell the HDMI controller
helpers if a given TMDS character rate is reachable for them or not.

This will then be useful to figure out the best format and bpc count for
a given mode.

Reviewed-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20240527-kms-hdmi-connector-state-v15-13-c5af16c3aae2@kernel.org
Signed-off-by: Maxime Ripard <mripard@kernel.org>
This commit is contained in:
Maxime Ripard
2024-05-27 15:58:02 +02:00
parent 62eea52075
commit e5030a74f9
5 changed files with 62 additions and 0 deletions
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4
drivers/gpu/drm/tests/drm_hdmi_state_helper_test.c
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@@ -112,6 +112,9 @@ static int set_connector_edid(struct kunit *test, struct drm_connector *connecto
return 0;
}
static const struct drm_connector_hdmi_funcs dummy_connector_hdmi_funcs = {
};
static int dummy_connector_get_modes(struct drm_connector *connector)
{
struct drm_atomic_helper_connector_hdmi_priv *priv =
@@ -194,6 +197,7 @@ drm_atomic_helper_connector_hdmi_init(struct kunit *test,
conn = &priv->connector;
ret = drmm_connector_hdmi_init(drm, conn,
&dummy_connector_funcs,
&dummy_connector_hdmi_funcs,
DRM_MODE_CONNECTOR_HDMIA,
NULL,
formats,