diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-5.4/950-0270-drm-v3d-Clock-V3D-down-when-not-in-use.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-5.4/950-0270-drm-v3d-Clock-V3D-down-when-not-in-use.patch | 161 |
1 files changed, 0 insertions, 161 deletions
diff --git a/target/linux/bcm27xx/patches-5.4/950-0270-drm-v3d-Clock-V3D-down-when-not-in-use.patch b/target/linux/bcm27xx/patches-5.4/950-0270-drm-v3d-Clock-V3D-down-when-not-in-use.patch deleted file mode 100644 index 782cc197d5..0000000000 --- a/target/linux/bcm27xx/patches-5.4/950-0270-drm-v3d-Clock-V3D-down-when-not-in-use.patch +++ /dev/null @@ -1,161 +0,0 @@ -From ca8579839f0ebf0ffe73d1135284363b2155e712 Mon Sep 17 00:00:00 2001 -From: Eric Anholt <eric@anholt.net> -Date: Thu, 2 May 2019 13:22:53 -0700 -Subject: [PATCH] drm/v3d: Clock V3D down when not in use. - -My various attempts at re-enabling runtime PM have failed, so just -crank the clock down when V3D is idle to reduce power consumption. - -Signed-off-by: Eric Anholt <eric@anholt.net> ---- - drivers/gpu/drm/v3d/v3d_drv.c | 18 ++++++++++++ - drivers/gpu/drm/v3d/v3d_drv.h | 6 ++++ - drivers/gpu/drm/v3d/v3d_gem.c | 53 +++++++++++++++++++++++++++++++---- - 3 files changed, 72 insertions(+), 5 deletions(-) - ---- a/drivers/gpu/drm/v3d/v3d_drv.c -+++ b/drivers/gpu/drm/v3d/v3d_drv.c -@@ -282,6 +282,21 @@ static int v3d_platform_drm_probe(struct - } - } - -+ v3d->clk = devm_clk_get(dev, NULL); -+ if (IS_ERR(v3d->clk)) { -+ if (ret != -EPROBE_DEFER) -+ dev_err(dev, "Failed to get clock\n"); -+ goto dev_free; -+ } -+ v3d->clk_up_rate = clk_get_rate(v3d->clk); -+ /* For downclocking, drop it to the minimum frequency we can get from -+ * the CPRMAN clock generator dividing off our parent. The divider is -+ * 4 bits, but ask for just higher than that so that rounding doesn't -+ * make cprman reject our rate. -+ */ -+ v3d->clk_down_rate = -+ (clk_get_rate(clk_get_parent(v3d->clk)) / (1 << 4)) + 10000; -+ - if (v3d->ver < 41) { - ret = map_regs(v3d, &v3d->gca_regs, "gca"); - if (ret) -@@ -316,6 +331,9 @@ static int v3d_platform_drm_probe(struct - if (ret) - goto irq_disable; - -+ ret = clk_set_rate(v3d->clk, v3d->clk_down_rate); -+ WARN_ON_ONCE(ret != 0); -+ - return 0; - - irq_disable: ---- a/drivers/gpu/drm/v3d/v3d_drv.h -+++ b/drivers/gpu/drm/v3d/v3d_drv.h -@@ -54,6 +54,12 @@ struct v3d_dev { - void __iomem *bridge_regs; - void __iomem *gca_regs; - struct clk *clk; -+ struct delayed_work clk_down_work; -+ unsigned long clk_up_rate, clk_down_rate; -+ struct mutex clk_lock; -+ u32 clk_refcount; -+ bool clk_up; -+ - struct reset_control *reset; - - /* Virtual and DMA addresses of the single shared page table. */ ---- a/drivers/gpu/drm/v3d/v3d_gem.c -+++ b/drivers/gpu/drm/v3d/v3d_gem.c -@@ -4,6 +4,7 @@ - #include <linux/device.h> - #include <linux/dma-mapping.h> - #include <linux/io.h> -+#include <linux/clk.h> - #include <linux/module.h> - #include <linux/platform_device.h> - #include <linux/pm_runtime.h> -@@ -19,6 +20,47 @@ - #include "v3d_trace.h" - - static void -+v3d_clock_down_work(struct work_struct *work) -+{ -+ struct v3d_dev *v3d = -+ container_of(work, struct v3d_dev, clk_down_work.work); -+ int ret; -+ -+ ret = clk_set_rate(v3d->clk, v3d->clk_down_rate); -+ v3d->clk_up = false; -+ WARN_ON_ONCE(ret != 0); -+} -+ -+static void -+v3d_clock_up_get(struct v3d_dev *v3d) -+{ -+ mutex_lock(&v3d->clk_lock); -+ if (v3d->clk_refcount++ == 0) { -+ cancel_delayed_work_sync(&v3d->clk_down_work); -+ if (!v3d->clk_up) { -+ int ret; -+ -+ ret = clk_set_rate(v3d->clk, v3d->clk_up_rate); -+ WARN_ON_ONCE(ret != 0); -+ v3d->clk_up = true; -+ } -+ } -+ mutex_unlock(&v3d->clk_lock); -+} -+ -+static void -+v3d_clock_up_put(struct v3d_dev *v3d) -+{ -+ mutex_lock(&v3d->clk_lock); -+ if (--v3d->clk_refcount == 0) { -+ schedule_delayed_work(&v3d->clk_down_work, -+ msecs_to_jiffies(100)); -+ } -+ mutex_unlock(&v3d->clk_lock); -+} -+ -+ -+static void - v3d_init_core(struct v3d_dev *v3d, int core) - { - /* Set OVRTMUOUT, which means that the texture sampler uniform -@@ -354,6 +396,7 @@ v3d_job_free(struct kref *ref) - struct v3d_job *job = container_of(ref, struct v3d_job, refcount); - unsigned long index; - struct dma_fence *fence; -+ struct v3d_dev *v3d = job->v3d; - int i; - - for (i = 0; i < job->bo_count; i++) { -@@ -367,11 +410,7 @@ v3d_job_free(struct kref *ref) - } - xa_destroy(&job->deps); - -- dma_fence_put(job->irq_fence); -- dma_fence_put(job->done_fence); -- -- pm_runtime_mark_last_busy(job->v3d->dev); -- pm_runtime_put_autosuspend(job->v3d->dev); -+ v3d_clock_up_put(v3d); - - kfree(job); - } -@@ -453,6 +492,7 @@ v3d_job_init(struct v3d_dev *v3d, struct - if (ret) - goto fail; - -+ v3d_clock_up_get(v3d); - kref_init(&job->refcount); - - return 0; -@@ -841,6 +881,9 @@ v3d_gem_init(struct drm_device *dev) - mutex_init(&v3d->sched_lock); - mutex_init(&v3d->cache_clean_lock); - -+ mutex_init(&v3d->clk_lock); -+ INIT_DELAYED_WORK(&v3d->clk_down_work, v3d_clock_down_work); -+ - /* Note: We don't allocate address 0. Various bits of HW - * treat 0 as special, such as the occlusion query counters - * where 0 means "disabled". |