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drm/vc4: Skip ULPS latching when we're in that ULPS state already.
author
Eric Anholt
<eric@anholt.net>
Tue, 31 Oct 2017 19:32:57 +0000
(12:32 -0700)
committer
Eric Anholt
<eric@anholt.net>
Mon, 30 Apr 2018 20:57:13 +0000
(13:57 -0700)
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>
Link:
https://patchwork.freedesktop.org/patch/msgid/20171031193258.17373-1-eric@anholt.net
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
drivers/gpu/drm/vc4/vc4_dsi.c
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diff --git
a/drivers/gpu/drm/vc4/vc4_dsi.c
b/drivers/gpu/drm/vc4/vc4_dsi.c
index
94085f8
..
8aa8978
100644
(file)
--- 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);