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drm/rockchip: analogix_dp: Refuse to enable PSR if panel doesn't support it 

There's no point in enabling PSR when the panel doesn't support it.

This also avoids a problem when PSR gets enabled when a CRTC is being
disabled, because sometimes in that situation the DSP_HOLD_VALID_INTR
interrupt on which we wait will never arrive. This was observed on
RK3288 with a panel without PSR (veyron-jaq Chromebook).

It's very easy to reproduce by running the kms_rmfb test in IGT a few
times.

Cc: Yakir Yang <ykk@rock-chips.com>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Signed-off-by: Archit Taneja <architt@codeaurora.org>
Link: http://patchwork.freedesktop.org/patch/msgid/1474639600-30090-2-git-send-email-tomeu.vizoso@collabora.com
This commit is contained in:
Tomeu Vizoso 2016-09-23 16:06:40 +02:00 committed by Daniel Vetter
parent 561b069008
commit 0546d685f0
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/rockchip/analogix_dp-rockchip.c
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@ -85,6 +85,9 @@ static void analogix_dp_psr_set(struct drm_encoder *encoder, bool enabled)
struct rockchip_dp_device *dp = to_dp(encoder);
unsigned long flags;
if (!analogix_dp_psr_supported(dp->dev))
return;
dev_dbg(dp->dev, "%s PSR...\n", enabled ? "Entry" : "Exit");
spin_lock_irqsave(&dp->psr_lock, flags);