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drm: bridge: dw-hdmi: fix GCP default phase in deep color mode

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According to HDMI 1.4b specification: If the transmitted video
format has timing such that the phase of the first pixel of
every Video Data Period corresponds to pixel packing phase 0
(e.g. 10P0, 12P0, 16P0), the Source may set the Default_Phase
bit in the GCP. The Sink may use this bit to optimize its filtering
or handling of the PP field.

This means that for 10-bit mode the Htotal must be dividable by 4;
for 12-bit mode, the Htotal must be divisible by 2.

Change-Id: I02e632d095141cbabcba06dc1321ae0dc69dc736
Signed-off-by: Zheng Yang <zhengyang@rock-chips.com>
This commit is contained in:
Zheng Yang
2017-11-15 10:46:56 +08:00
committed by Tao Huang
parent 66512f6dc7
commit eebdd21044
1 changed files with 7 additions and 2 deletions
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9
drivers/gpu/drm/bridge/synopsys/dw-hdmi.c
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@@ -1444,8 +1444,13 @@ static void hdmi_video_packetize(struct dw_hdmi *hdmi)
HDMI_VP_CONF_PR_EN_MASK |
HDMI_VP_CONF_BYPASS_SELECT_MASK, HDMI_VP_CONF);
hdmi_modb(hdmi, 1 << HDMI_VP_STUFF_IDEFAULT_PHASE_OFFSET,
HDMI_VP_STUFF_IDEFAULT_PHASE_MASK, HDMI_VP_STUFF);
if ((color_depth == 5 && hdmi->previous_mode.htotal % 4) ||
(color_depth == 6 && hdmi->previous_mode.htotal % 2))
hdmi_modb(hdmi, 0, HDMI_VP_STUFF_IDEFAULT_PHASE_MASK,
HDMI_VP_STUFF);
else
hdmi_modb(hdmi, 1 << HDMI_VP_STUFF_IDEFAULT_PHASE_OFFSET,
HDMI_VP_STUFF_IDEFAULT_PHASE_MASK, HDMI_VP_STUFF);
hdmi_writeb(hdmi, remap_size, HDMI_VP_REMAP);