From f389abea861f9bd3165f98a8d3a1f3407e9fc01a Mon Sep 17 00:00:00 2001 From: Eric Anholt Date: Mon, 14 Jan 2019 12:35:43 -0800 Subject: [PATCH] drm/v3d: Skip MMU flush if the device is currently off. If it's off, we know it will be reset on poweron, so the MMU won't have any TLB cached from before this point. Avoids failed waits for MMU flush to reply. Signed-off-by: Eric Anholt (cherry picked from commit 3ee4e2e0a9e9587eacbb69b067bbc72ab2cdc47b) --- drivers/gpu/drm/v3d/v3d_mmu.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) --- a/drivers/gpu/drm/v3d/v3d_mmu.c +++ b/drivers/gpu/drm/v3d/v3d_mmu.c @@ -18,6 +18,8 @@ * each client. This is not yet implemented. */ +#include + #include "v3d_drv.h" #include "v3d_regs.h" @@ -34,6 +36,14 @@ static int v3d_mmu_flush_all(struct v3d_ { int ret; + /* Keep power on the device on until we're done with this + * call, but skip the flush if the device is off and will be + * reset when powered back on. + */ + ret = pm_runtime_get_if_in_use(v3d->dev); + if (ret == 0) + return 0; + /* Make sure that another flush isn't already running when we * start this one. */ @@ -61,6 +71,9 @@ static int v3d_mmu_flush_all(struct v3d_ if (ret) dev_err(v3d->dev, "MMUC flush wait idle failed\n"); + pm_runtime_mark_last_busy(v3d->dev); + pm_runtime_put_autosuspend(v3d->dev); + return ret; }