drm/bridge: it6505: Add caching for EDID

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Add caching when EDID is read, and invalidate the cache until the
bridge detects HPD low or sink count changes on HPD_IRQ.

It takes 1.2s for IT6505 bridge to read a 3-block EDID, and skipping
one EDID read would be a notable difference on user experience.

Signed-off-by: Pin-yen Lin <treapking@chromium.org>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Signed-off-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20221115112720.911158-1-treapking@chromium.org

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Pin-yen Lin 2022-11-15 19:27:20 +08:00 • committed by Robert Foss

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commit 11feaef69d

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drivers/gpu/drm/bridge/ite-it6505.c

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