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drm/i915/icl: Set GCP_COLOR_INDICATION only for 10/12 bit deep color

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v2: Fix commit msg to reflect why issue occurs(Jani)
Set GCP_COLOR_INDICATION only when we set 10/12 bit deep color.

Changing settings from 10/12 bit deep color to 8 bit(& vice versa)
doesn't work correctly using xrandr max bpc property. When we
connect a monitor which supports deep color, the highest deep color
setting is selected; which sets GCP_COLOR_INDICATION. When we change
the setting to 8 bit color, we still set GCP_COLOR_INDICATION which
doesn't allow the switch back to 8 bit color.

v3,4: Add comments & drop changes in intel_hdmi_compute_config(Ville)
Since HSW+, GCP_COLOR_INDICATION is not required for 8bpc.

Drop the changes in intel_hdmi_compute_config as desired_bpp
is needed to change values for pipe_bpp based on bw_constrained flag.

v5: Fix missing logical && in condition for setting GCP_COLOR_INDICATION.

v6: Fix comment formatting (Ville)

v7: Add reviewed by Ville

v8: Set GCP_COLOR_INDICATION based on spec:
For Gen 7.5 or later platforms, indicate color depth only for deep
color modes. Bspec: 8135,7751,50524

Pre DDI platforms, indicate color depth if deep color is supported
by sink. Bspec: 7854

Exception: CHERRYVIEW behaves like Pre DDI platforms.
Bspec: 15975

Check pipe_bpp is less than bpp * 3 in hdmi_deep_color_possible,
to not set 12 bit deep color for every modeset. This fixes the issue
where 12 bit color was selected even when user selected 10 bit.(Ville)

v9: Maintain a consistent behavior for all platforms and support
GCP_COLOR_INDICATION only when we are in deep color mode. Remove
hdmi_sink_is_deep_color() - no longer needed as checking pipe_bpp > 24
takes care of the deep color mode scenario.

Separate patch for fixing switch from 12 bit to 10 bit deep color
mode.

Co-developed-by: Aditya Swarup <aditya.swarup@intel.com>
Signed-off-by: Clinton Taylor <Clinton.A.Taylor@intel.com>
Signed-off-by: Aditya Swarup <aditya.swarup@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190429230811.9983-1-aditya.swarup@intel.com
This commit is contained in:
Clinton Taylor 2019-04-29 16:08:11 -07:00 committed by Jani Nikula
parent dc58958d08
commit 05d9c8783b
1 changed files with 2 additions and 15 deletions
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17
drivers/gpu/drm/i915/intel_hdmi.c
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@ -863,19 +863,6 @@ static void g4x_set_infoframes(struct intel_encoder *encoder,
&crtc_state->infoframes.hdmi);
}
static bool hdmi_sink_is_deep_color(const struct drm_connector_state *conn_state)
{
struct drm_connector *connector = conn_state->connector;
/*
* HDMI cloning is only supported on g4x which doesn't
* support deep color or GCP infoframes anyway so no
* need to worry about multiple HDMI sinks here.
*/
return connector->display_info.bpc > 8;
}
/*
* Determine if default_phase=1 can be indicated in the GCP infoframe.
*
@ -980,8 +967,8 @@ static void intel_hdmi_compute_gcp_infoframe(struct intel_encoder *encoder,
crtc_state->infoframes.enable |=
intel_hdmi_infoframe_enable(HDMI_PACKET_TYPE_GENERAL_CONTROL);
/* Indicate color depth whenever the sink supports deep color */
if (hdmi_sink_is_deep_color(conn_state))
/* Indicate color indication for deep color mode */
if (crtc_state->pipe_bpp > 24)
crtc_state->infoframes.gcp |= GCP_COLOR_INDICATION;
/* Enable default_phase whenever the display mode is suitably aligned */