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53 lines
1.4 KiB
Diff
53 lines
1.4 KiB
Diff
From f34daf3b5ae9533f88d31eef74bbf38099e96aa1 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 14 Jan 2019 12:35:43 -0800
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Subject: [PATCH] drm/v3d: Skip MMU flush if the device is currently
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off.
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If it's off, we know it will be reset on poweron, so the MMU won't
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have any TLB cached from before this point. Avoids failed waits for
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MMU flush to reply.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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(cherry picked from commit 3ee4e2e0a9e9587eacbb69b067bbc72ab2cdc47b)
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---
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drivers/gpu/drm/v3d/v3d_mmu.c | 13 +++++++++++++
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1 file changed, 13 insertions(+)
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--- a/drivers/gpu/drm/v3d/v3d_mmu.c
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+++ b/drivers/gpu/drm/v3d/v3d_mmu.c
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@@ -18,6 +18,8 @@
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* each client. This is not yet implemented.
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*/
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+#include <linux/pm_runtime.h>
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+
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#include "v3d_drv.h"
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#include "v3d_regs.h"
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@@ -34,6 +36,14 @@ static int v3d_mmu_flush_all(struct v3d_
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{
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int ret;
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+ /* Keep power on the device on until we're done with this
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+ * call, but skip the flush if the device is off and will be
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+ * reset when powered back on.
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+ */
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+ ret = pm_runtime_get_if_in_use(v3d->dev);
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+ if (ret == 0)
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+ return 0;
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+
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/* Make sure that another flush isn't already running when we
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* start this one.
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*/
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@@ -61,6 +71,9 @@ static int v3d_mmu_flush_all(struct v3d_
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if (ret)
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dev_err(v3d->dev, "MMUC flush wait idle failed\n");
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+ pm_runtime_mark_last_busy(v3d->dev);
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+ pm_runtime_put_autosuspend(v3d->dev);
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+
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return ret;
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}
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