diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0203-drm-vc4-Skip-ULPS-latching-when-we-re-in-that-ULPS-s.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.14/950-0203-drm-vc4-Skip-ULPS-latching-when-we-re-in-that-ULPS-s.patch | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0203-drm-vc4-Skip-ULPS-latching-when-we-re-in-that-ULPS-s.patch b/target/linux/brcm2708/patches-4.14/950-0203-drm-vc4-Skip-ULPS-latching-when-we-re-in-that-ULPS-s.patch new file mode 100644 index 0000000000..b01062c1b2 --- /dev/null +++ b/target/linux/brcm2708/patches-4.14/950-0203-drm-vc4-Skip-ULPS-latching-when-we-re-in-that-ULPS-s.patch @@ -0,0 +1,28 @@ +From c86b5da9e8c4ca0fedd6cdbfc70cdc5f61b5d711 Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +Date: Tue, 31 Oct 2017 11:33:10 -0700 +Subject: [PATCH 203/454] drm/vc4: Skip ULPS latching when we're in that ULPS + state already. + +It seems that trying to go from unlatched to unlatched will time out +waiting for STOP, and we can just skip that. + +Signed-off-by: Eric Anholt <eric@anholt.net> +--- + drivers/gpu/drm/vc4/vc4_dsi.c | 5 +++++ + 1 file changed, 5 insertions(+) + +--- a/drivers/gpu/drm/vc4/vc4_dsi.c ++++ b/drivers/gpu/drm/vc4/vc4_dsi.c +@@ -753,6 +753,11 @@ static void vc4_dsi_ulps(struct vc4_dsi + (dsi->lanes > 2 ? DSI1_STAT_PHY_D2_STOP : 0) | + (dsi->lanes > 3 ? DSI1_STAT_PHY_D3_STOP : 0)); + int ret; ++ bool ulps_currently_enabled = (DSI_PORT_READ(PHY_AFEC0) & ++ DSI_PORT_BIT(PHY_AFEC0_LATCH_ULPS)); ++ ++ if (ulps == ulps_currently_enabled) ++ return; + + DSI_PORT_WRITE(STAT, stat_ulps); + DSI_PORT_WRITE(PHYC, DSI_PORT_READ(PHYC) | phyc_ulps); |