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drm/connector: Initialise max_bpc to the minimum value supported

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Using increased bit depth for no reason increases power
consumption, and differs from the behaviour prior to the
conversion to use the HDMI helper functions.

Initialise the state max_bpc and requested_max_bpc to the
minimum value supported. This only affects Raspberry Pi,
as the other users of the helpers (rockchip/inno_hdmi and
sunx4i) only support a bit depth of 8.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
This commit is contained in:
Dave Stevenson
2024-11-21 18:30:07 +00:00
committed by Dom Cobley
parent 79af6e883f
commit 501710350d
2 changed files with 3 additions and 3 deletions
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2
drivers/gpu/drm/display/drm_hdmi_state_helper.c
View File

@@ -321,7 +321,7 @@ void __drm_atomic_helper_connector_hdmi_reset(struct drm_connector *connector,
unsigned int max_bpc = connector->max_bpc;
new_conn_state->max_bpc = max_bpc;
new_conn_state->max_requested_bpc = max_bpc;
new_conn_state->max_requested_bpc = 8;
new_conn_state->hdmi.broadcast_rgb = DRM_HDMI_BROADCAST_RGB_AUTO;
}
EXPORT_SYMBOL(__drm_atomic_helper_connector_hdmi_reset);

4
drivers/gpu/drm/drm_connector.c
View File

@@ -2839,8 +2839,8 @@ int drm_connector_attach_max_bpc_property(struct drm_connector *connector,
}
drm_object_attach_property(&connector->base, prop, max);
connector->state->max_requested_bpc = max;
connector->state->max_bpc = max;
connector->state->max_requested_bpc = min;
connector->state->max_bpc = min;
return 0;
}