On 4/2/19 5:53 AM, Ville Syrjälä wrote:
On Tue, Apr 02, 2019 at 05:14:39AM -0700, Aditya Swarup wrote:
From: Clinton Taylor <Clinton.A.Taylor@xxxxxxxxx>
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.
Why not? Table 6-1 in HDMI 1.4a spec clearly lists 8bpc as a
valid setting for GCP.
This appears to be a undocumented SI issue. According to the spec 8 bit
is a valid GCP value. However, if you enable GCP indication and 8 bit is
current then 10 bit is transmit via GCP confusing monitors. The GCP is
being validated using 2 different HDMI Analyzer's confirming the results.
We will file a SI bug against the current behavior.
-Clint
Signed-off-by: Clinton Taylor <Clinton.A.Taylor@xxxxxxxxx>
Signed-off-by: Aditya Swarup <aditya.swarup@xxxxxxxxx>
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxx>
Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
---
drivers/gpu/drm/i915/intel_hdmi.c | 31 +++++++++++++++----------------
1 file changed, 15 insertions(+), 16 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index 5ccb305a6e1c..4760462f84ca 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -963,7 +963,9 @@ static void intel_hdmi_compute_gcp_infoframe(struct intel_encoder *encoder,
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))
+
+ if (hdmi_sink_is_deep_color(conn_state) &&
+ (crtc_state->pipe_bpp > 24))
crtc_state->infoframes.gcp |= GCP_COLOR_INDICATION;
/* Enable default_phase whenever the display mode is suitably aligned */
@@ -2260,6 +2262,7 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
int clock_8bpc = pipe_config->base.adjusted_mode.crtc_clock;
int clock_10bpc = clock_8bpc * 5 / 4;
int clock_12bpc = clock_8bpc * 3 / 2;
+ int dc_clock = clock_12bpc;
int desired_bpp;
bool force_dvi = intel_conn_state->force_audio == HDMI_AUDIO_OFF_DVI;
@@ -2314,22 +2317,18 @@ int intel_hdmi_compute_config(struct intel_encoder *encoder,
* Note that g4x/vlv don't support 12bpc hdmi outputs. We also need
* to check that the higher clock still fits within limits.
*/
- if (hdmi_deep_color_possible(pipe_config, 12) &&
- hdmi_port_clock_valid(intel_hdmi, clock_12bpc,
+ if (pipe_config->pipe_bpp == 30)
+ dc_clock = clock_10bpc;
+
+ if (hdmi_deep_color_possible(pipe_config, pipe_config->pipe_bpp / 3) &&
+ hdmi_port_clock_valid(intel_hdmi, dc_clock,
true, force_dvi) == MODE_OK) {
- DRM_DEBUG_KMS("picking bpc to 12 for HDMI output\n");
- desired_bpp = 12*3;
-
- /* Need to adjust the port link by 1.5x for 12bpc. */
- pipe_config->port_clock = clock_12bpc;
- } else if (hdmi_deep_color_possible(pipe_config, 10) &&
- hdmi_port_clock_valid(intel_hdmi, clock_10bpc,
- true, force_dvi) == MODE_OK) {
- DRM_DEBUG_KMS("picking bpc to 10 for HDMI output\n");
- desired_bpp = 10 * 3;
-
- /* Need to adjust the port link by 1.25x for 10bpc. */
- pipe_config->port_clock = clock_10bpc;
+ DRM_DEBUG_KMS("picking bpc to %d for HDMI output\n",
+ pipe_config->pipe_bpp / 3);
+ desired_bpp = pipe_config->pipe_bpp;
+
+ /* Need to adjust the port link dc modes. */
+ pipe_config->port_clock = dc_clock;
This part has nothing to do with the commit message.
} else {
DRM_DEBUG_KMS("picking bpc to 8 for HDMI output\n");
desired_bpp = 8*3;
--
2.17.1
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