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authorJernej Skrabec <jernej.skrabec@siol.net>2020-05-09 22:06:43 +0200
committerMauro Carvalho Chehab <mchehab+huawei@kernel.org>2020-06-11 19:19:27 +0200
commitd5aecd289babf3adcf5a837b067a5efddb097d99 (patch)
treeb548dd464257354404a7966731e104591c466ee9 /drivers/staging/media/sunxi/cedrus/cedrus_hw.c
parenta8876c22eab9a871834f85de83e98bbf7e6e264d (diff)
media: cedrus: Implement runtime PM
This allows the VE clocks and PLL_VE to be disabled most of the time. A runtime PM reference is held while streaming. Signed-off-by: Jernej Skrabec <jernej.skrabec@siol.net> Signed-off-by: Samuel Holland <samuel@sholland.org> Reviewed-by: Ezequiel Garcia <ezequiel@collabora.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Diffstat (limited to 'drivers/staging/media/sunxi/cedrus/cedrus_hw.c')
-rw-r--r--drivers/staging/media/sunxi/cedrus/cedrus_hw.c106
1 files changed, 69 insertions, 37 deletions
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_hw.c b/drivers/staging/media/sunxi/cedrus/cedrus_hw.c
index daf5f244f93b..1744e6fcc999 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus_hw.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus_hw.c
@@ -19,6 +19,7 @@
#include <linux/dma-mapping.h>
#include <linux/interrupt.h>
#include <linux/clk.h>
+#include <linux/pm_runtime.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include <linux/soc/sunxi/sunxi_sram.h>
@@ -140,6 +141,64 @@ static irqreturn_t cedrus_irq(int irq, void *data)
return IRQ_HANDLED;
}
+int cedrus_hw_suspend(struct device *device)
+{
+ struct cedrus_dev *dev = dev_get_drvdata(device);
+
+ reset_control_assert(dev->rstc);
+
+ clk_disable_unprepare(dev->ram_clk);
+ clk_disable_unprepare(dev->mod_clk);
+ clk_disable_unprepare(dev->ahb_clk);
+
+ return 0;
+}
+
+int cedrus_hw_resume(struct device *device)
+{
+ struct cedrus_dev *dev = dev_get_drvdata(device);
+ int ret;
+
+ ret = clk_prepare_enable(dev->ahb_clk);
+ if (ret) {
+ dev_err(dev->dev, "Failed to enable AHB clock\n");
+
+ return ret;
+ }
+
+ ret = clk_prepare_enable(dev->mod_clk);
+ if (ret) {
+ dev_err(dev->dev, "Failed to enable MOD clock\n");
+
+ goto err_ahb_clk;
+ }
+
+ ret = clk_prepare_enable(dev->ram_clk);
+ if (ret) {
+ dev_err(dev->dev, "Failed to enable RAM clock\n");
+
+ goto err_mod_clk;
+ }
+
+ ret = reset_control_reset(dev->rstc);
+ if (ret) {
+ dev_err(dev->dev, "Failed to apply reset\n");
+
+ goto err_ram_clk;
+ }
+
+ return 0;
+
+err_ram_clk:
+ clk_disable_unprepare(dev->ram_clk);
+err_mod_clk:
+ clk_disable_unprepare(dev->mod_clk);
+err_ahb_clk:
+ clk_disable_unprepare(dev->ahb_clk);
+
+ return ret;
+}
+
int cedrus_hw_probe(struct cedrus_dev *dev)
{
const struct cedrus_variant *variant;
@@ -236,42 +295,17 @@ int cedrus_hw_probe(struct cedrus_dev *dev)
goto err_sram;
}
- ret = clk_prepare_enable(dev->ahb_clk);
- if (ret) {
- dev_err(dev->dev, "Failed to enable AHB clock\n");
-
- goto err_sram;
- }
-
- ret = clk_prepare_enable(dev->mod_clk);
- if (ret) {
- dev_err(dev->dev, "Failed to enable MOD clock\n");
-
- goto err_ahb_clk;
- }
-
- ret = clk_prepare_enable(dev->ram_clk);
- if (ret) {
- dev_err(dev->dev, "Failed to enable RAM clock\n");
-
- goto err_mod_clk;
- }
-
- ret = reset_control_reset(dev->rstc);
- if (ret) {
- dev_err(dev->dev, "Failed to apply reset\n");
-
- goto err_ram_clk;
+ pm_runtime_enable(dev->dev);
+ if (!pm_runtime_enabled(dev->dev)) {
+ ret = cedrus_hw_resume(dev->dev);
+ if (ret)
+ goto err_pm;
}
return 0;
-err_ram_clk:
- clk_disable_unprepare(dev->ram_clk);
-err_mod_clk:
- clk_disable_unprepare(dev->mod_clk);
-err_ahb_clk:
- clk_disable_unprepare(dev->ahb_clk);
+err_pm:
+ pm_runtime_disable(dev->dev);
err_sram:
sunxi_sram_release(dev->dev);
err_mem:
@@ -282,11 +316,9 @@ err_mem:
void cedrus_hw_remove(struct cedrus_dev *dev)
{
- reset_control_assert(dev->rstc);
-
- clk_disable_unprepare(dev->ram_clk);
- clk_disable_unprepare(dev->mod_clk);
- clk_disable_unprepare(dev->ahb_clk);
+ pm_runtime_disable(dev->dev);
+ if (!pm_runtime_status_suspended(dev->dev))
+ cedrus_hw_suspend(dev->dev);
sunxi_sram_release(dev->dev);

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