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 <e...@anholt.net>
---
drivers/gpu/drm/vc4/vc4_dsi.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_dsi.c b/drivers/gpu/drm/vc4/vc4_dsi.c
index 94085f8bcd68..8aa897835118 100644
--- 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, bool ulps)
(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);
--
2.15.0
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