011f2c26f1
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
102 lines
3 KiB
Diff
102 lines
3 KiB
Diff
From 7aa7785c89ccb0203b5eb9a3b26d5358cb2543c0 Mon Sep 17 00:00:00 2001
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From: Eric Anholt <eric@anholt.net>
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Date: Mon, 8 Feb 2016 12:59:02 -0800
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Subject: [PATCH] drm/vc4: Use runtime PM to power cycle the device when the
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GPU hangs.
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This gets us functional GPU reset again, like we had until a refactor
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at merge time. Tested with a little patch to stuff in a broken binner
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job every 100 frames.
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Signed-off-by: Eric Anholt <eric@anholt.net>
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(cherry picked from commit 36cb6253f9383fd9a59ee7b8458c6232ef48577c)
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---
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drivers/gpu/drm/vc4/vc4_drv.h | 6 +++++-
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drivers/gpu/drm/vc4/vc4_gem.c | 26 +++++++++++++++++++++-----
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2 files changed, 26 insertions(+), 6 deletions(-)
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--- a/drivers/gpu/drm/vc4/vc4_drv.h
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+++ b/drivers/gpu/drm/vc4/vc4_drv.h
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@@ -104,6 +104,11 @@ struct vc4_dev {
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struct vc4_bo *overflow_mem;
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struct work_struct overflow_mem_work;
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+ int power_refcount;
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+
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+ /* Mutex controlling the power refcount. */
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+ struct mutex power_lock;
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+
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struct {
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struct timer_list timer;
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struct work_struct reset_work;
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@@ -495,7 +500,6 @@ void vc4_plane_async_set_fb(struct drm_p
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extern struct platform_driver vc4_v3d_driver;
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int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused);
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int vc4_v3d_debugfs_regs(struct seq_file *m, void *unused);
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-int vc4_v3d_set_power(struct vc4_dev *vc4, bool on);
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/* vc4_validate.c */
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int
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--- a/drivers/gpu/drm/vc4/vc4_gem.c
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+++ b/drivers/gpu/drm/vc4/vc4_gem.c
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@@ -261,8 +261,16 @@ vc4_reset(struct drm_device *dev)
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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DRM_INFO("Resetting GPU.\n");
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- vc4_v3d_set_power(vc4, false);
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- vc4_v3d_set_power(vc4, true);
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+
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+ mutex_lock(&vc4->power_lock);
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+ if (vc4->power_refcount) {
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+ /* Power the device off and back on the by dropping the
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+ * reference on runtime PM.
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+ */
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+ pm_runtime_put_sync_suspend(&vc4->v3d->pdev->dev);
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+ pm_runtime_get_sync(&vc4->v3d->pdev->dev);
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+ }
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+ mutex_unlock(&vc4->power_lock);
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vc4_irq_reset(dev);
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@@ -709,7 +717,10 @@ vc4_complete_exec(struct drm_device *dev
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}
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mutex_unlock(&dev->struct_mutex);
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- pm_runtime_put(&vc4->v3d->pdev->dev);
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+ mutex_lock(&vc4->power_lock);
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+ if (--vc4->power_refcount == 0)
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+ pm_runtime_put(&vc4->v3d->pdev->dev);
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+ mutex_unlock(&vc4->power_lock);
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kfree(exec);
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}
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@@ -851,7 +862,7 @@ vc4_submit_cl_ioctl(struct drm_device *d
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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struct drm_vc4_submit_cl *args = data;
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struct vc4_exec_info *exec;
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- int ret;
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+ int ret = 0;
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if ((args->flags & ~VC4_SUBMIT_CL_USE_CLEAR_COLOR) != 0) {
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DRM_ERROR("Unknown flags: 0x%02x\n", args->flags);
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@@ -864,7 +875,10 @@ vc4_submit_cl_ioctl(struct drm_device *d
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return -ENOMEM;
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}
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- ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
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+ mutex_lock(&vc4->power_lock);
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+ if (vc4->power_refcount++ == 0)
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+ ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev);
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+ mutex_unlock(&vc4->power_lock);
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if (ret < 0) {
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kfree(exec);
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return ret;
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@@ -925,6 +939,8 @@ vc4_gem_init(struct drm_device *dev)
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(unsigned long)dev);
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INIT_WORK(&vc4->job_done_work, vc4_job_done_work);
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+
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+ mutex_init(&vc4->power_lock);
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}
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void
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