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29 lines
980 B
29 lines
980 B
6 years ago
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From c86b5da9e8c4ca0fedd6cdbfc70cdc5f61b5d711 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Tue, 31 Oct 2017 11:33:10 -0700
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Subject: [PATCH 203/454] drm/vc4: Skip ULPS latching when we're in that ULPS
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state already.
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It seems that trying to go from unlatched to unlatched will time out
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waiting for STOP, and we can just skip that.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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---
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drivers/gpu/drm/vc4/vc4_dsi.c | 5 +++++
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1 file changed, 5 insertions(+)
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--- a/drivers/gpu/drm/vc4/vc4_dsi.c
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+++ b/drivers/gpu/drm/vc4/vc4_dsi.c
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@@ -753,6 +753,11 @@ static void vc4_dsi_ulps(struct vc4_dsi
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(dsi->lanes > 2 ? DSI1_STAT_PHY_D2_STOP : 0) |
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(dsi->lanes > 3 ? DSI1_STAT_PHY_D3_STOP : 0));
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int ret;
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+ bool ulps_currently_enabled = (DSI_PORT_READ(PHY_AFEC0) &
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+ DSI_PORT_BIT(PHY_AFEC0_LATCH_ULPS));
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+
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+ if (ulps == ulps_currently_enabled)
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+ return;
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DSI_PORT_WRITE(STAT, stat_ulps);
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DSI_PORT_WRITE(PHYC, DSI_PORT_READ(PHYC) | phyc_ulps);
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