From 2b1c6b21b5e6c82ebb55d7fb7df90e60e88cbb14 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=C3=81lvaro=20Fern=C3=A1ndez=20Rojas?= Date: Sat, 10 Sep 2016 14:54:26 +0200 Subject: brcm2708: update linux 4.4 patches to latest version MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also adds support for Raspberry Pi Compute Module 3 (untested). Signed-off-by: Álvaro Fernández Rojas --- ...-runtime-PM-to-power-cycle-the-device-whe.patch | 102 +++++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 target/linux/brcm2708/patches-4.4/0468-drm-vc4-Use-runtime-PM-to-power-cycle-the-device-whe.patch (limited to 'target/linux/brcm2708/patches-4.4/0468-drm-vc4-Use-runtime-PM-to-power-cycle-the-device-whe.patch') diff --git a/target/linux/brcm2708/patches-4.4/0468-drm-vc4-Use-runtime-PM-to-power-cycle-the-device-whe.patch b/target/linux/brcm2708/patches-4.4/0468-drm-vc4-Use-runtime-PM-to-power-cycle-the-device-whe.patch new file mode 100644 index 0000000000..d771261a19 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0468-drm-vc4-Use-runtime-PM-to-power-cycle-the-device-whe.patch @@ -0,0 +1,102 @@ +From e70d1a5fdbb7277490c273533ce535977326c6a5 Mon Sep 17 00:00:00 2001 +From: Eric Anholt +Date: Mon, 8 Feb 2016 12:59:02 -0800 +Subject: [PATCH] drm/vc4: Use runtime PM to power cycle the device when the + GPU hangs. + +This gets us functional GPU reset again, like we had until a refactor +at merge time. Tested with a little patch to stuff in a broken binner +job every 100 frames. + +Signed-off-by: Eric Anholt +(cherry picked from commit 36cb6253f9383fd9a59ee7b8458c6232ef48577c) +--- + drivers/gpu/drm/vc4/vc4_drv.h | 6 +++++- + drivers/gpu/drm/vc4/vc4_gem.c | 26 +++++++++++++++++++++----- + 2 files changed, 26 insertions(+), 6 deletions(-) + +--- a/drivers/gpu/drm/vc4/vc4_drv.h ++++ b/drivers/gpu/drm/vc4/vc4_drv.h +@@ -104,6 +104,11 @@ struct vc4_dev { + struct vc4_bo *overflow_mem; + struct work_struct overflow_mem_work; + ++ int power_refcount; ++ ++ /* Mutex controlling the power refcount. */ ++ struct mutex power_lock; ++ + struct { + struct timer_list timer; + struct work_struct reset_work; +@@ -495,7 +500,6 @@ void vc4_plane_async_set_fb(struct drm_p + extern struct platform_driver vc4_v3d_driver; + int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused); + int vc4_v3d_debugfs_regs(struct seq_file *m, void *unused); +-int vc4_v3d_set_power(struct vc4_dev *vc4, bool on); + + /* vc4_validate.c */ + int +--- a/drivers/gpu/drm/vc4/vc4_gem.c ++++ b/drivers/gpu/drm/vc4/vc4_gem.c +@@ -261,8 +261,16 @@ vc4_reset(struct drm_device *dev) + struct vc4_dev *vc4 = to_vc4_dev(dev); + + DRM_INFO("Resetting GPU.\n"); +- vc4_v3d_set_power(vc4, false); +- vc4_v3d_set_power(vc4, true); ++ ++ mutex_lock(&vc4->power_lock); ++ if (vc4->power_refcount) { ++ /* Power the device off and back on the by dropping the ++ * reference on runtime PM. ++ */ ++ pm_runtime_put_sync_suspend(&vc4->v3d->pdev->dev); ++ pm_runtime_get_sync(&vc4->v3d->pdev->dev); ++ } ++ mutex_unlock(&vc4->power_lock); + + vc4_irq_reset(dev); + +@@ -709,7 +717,10 @@ vc4_complete_exec(struct drm_device *dev + } + mutex_unlock(&dev->struct_mutex); + +- pm_runtime_put(&vc4->v3d->pdev->dev); ++ mutex_lock(&vc4->power_lock); ++ if (--vc4->power_refcount == 0) ++ pm_runtime_put(&vc4->v3d->pdev->dev); ++ mutex_unlock(&vc4->power_lock); + + kfree(exec); + } +@@ -851,7 +862,7 @@ vc4_submit_cl_ioctl(struct drm_device *d + struct vc4_dev *vc4 = to_vc4_dev(dev); + struct drm_vc4_submit_cl *args = data; + struct vc4_exec_info *exec; +- int ret; ++ int ret = 0; + + if ((args->flags & ~VC4_SUBMIT_CL_USE_CLEAR_COLOR) != 0) { + DRM_ERROR("Unknown flags: 0x%02x\n", args->flags); +@@ -864,7 +875,10 @@ vc4_submit_cl_ioctl(struct drm_device *d + return -ENOMEM; + } + +- ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); ++ mutex_lock(&vc4->power_lock); ++ if (vc4->power_refcount++ == 0) ++ ret = pm_runtime_get_sync(&vc4->v3d->pdev->dev); ++ mutex_unlock(&vc4->power_lock); + if (ret < 0) { + kfree(exec); + return ret; +@@ -925,6 +939,8 @@ vc4_gem_init(struct drm_device *dev) + (unsigned long)dev); + + INIT_WORK(&vc4->job_done_work, vc4_job_done_work); ++ ++ mutex_init(&vc4->power_lock); + } + + void -- cgit v1.2.3