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drm/bridge: parade-ps8640: Fix additional suspend/resume at bootup

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Through log and waveform, we can see that there will be additional
suspend/resume when booting. This timing does not meet the ps8640 spec.
It seems that the delay of 500ms does not satisfied drm_panel_get_modes.
I increased it to 900ms and it seems that this problem can be solved.
To be safe, I'd just round up to a full 1000.

Signed-off-by: yangcong <yangcong5@huaqin.corp-partner.google.com>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20211112084302.2447931-1-yangcong5@huaqin.corp-partner.google.com
This commit is contained in:
yangcong 2021-11-12 16:43:02 +08:00 committed by Douglas Anderson
parent 49c39ec467
commit aa70a0996b
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/bridge/parade-ps8640.c
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@ -634,13 +634,13 @@ static int ps8640_probe(struct i2c_client *client)
pm_runtime_enable(dev);
/*
* Powering on ps8640 takes ~300ms. To avoid wasting time on power
* cycling ps8640 too often, set autosuspend_delay to 500ms to ensure
* cycling ps8640 too often, set autosuspend_delay to 1000ms to ensure
* the bridge wouldn't suspend in between each _aux_transfer_msg() call
* during EDID read (~20ms in my experiment) and in between the last
* _aux_transfer_msg() call during EDID read and the _pre_enable() call
* (~100ms in my experiment).
*/
pm_runtime_set_autosuspend_delay(dev, 500);
pm_runtime_set_autosuspend_delay(dev, 1000);
pm_runtime_use_autosuspend(dev);
pm_suspend_ignore_children(dev, true);
ret = devm_add_action_or_reset(dev, ps8640_runtime_disable, dev);