diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.19/950-0508-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.19/950-0508-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.19/950-0508-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch b/target/linux/brcm2708/patches-4.19/950-0508-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch new file mode 100644 index 0000000000..57f8e508c6 --- /dev/null +++ b/target/linux/brcm2708/patches-4.19/950-0508-drm-v3d-Skip-MMU-flush-if-the-device-is-currently-of.patch @@ -0,0 +1,52 @@ +From f389abea861f9bd3165f98a8d3a1f3407e9fc01a Mon Sep 17 00:00:00 2001 +From: Eric Anholt <eric@anholt.net> +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 <eric@anholt.net> +(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 <linux/pm_runtime.h> ++ + #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; + } + |