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drm/vc4: Skip ULPS latching when we're in that ULPS state already.

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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>
This commit is contained in:
Eric Anholt 2017-10-31 12:32:57 -07:00
parent 5e7854bd03
commit 1825067e2b
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/vc4/vc4_dsi.c
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@ -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 > 2 ? DSI1_STAT_PHY_D2_STOP : 0) |
(dsi->lanes > 3 ? DSI1_STAT_PHY_D3_STOP : 0)); (dsi->lanes > 3 ? DSI1_STAT_PHY_D3_STOP : 0));
int ret; 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(STAT, stat_ulps);
DSI_PORT_WRITE(PHYC, DSI_PORT_READ(PHYC) | phyc_ulps); DSI_PORT_WRITE(PHYC, DSI_PORT_READ(PHYC) | phyc_ulps);