diff mbox series

[v6,5/6] media: venus: core: Add support for opp tables/perf voting

Message ID 1592222564-13556-6-git-send-email-rnayak@codeaurora.org (mailing list archive)
State New, archived
Headers show
Series DVFS for IO devices on sdm845 and sc7180 | expand

Commit Message

Rajendra Nayak June 15, 2020, 12:02 p.m. UTC 
Add support to add OPP tables and perf voting on the OPP powerdomain.
This is needed so venus votes on the corresponding performance state
for the OPP powerdomain along with setting the core clock rate.

Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
Cc: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Cc: linux-media@vger.kernel.org
---
No functional change in v6, rebased over 5.8-rc1
Bindings update to add optional PD https://lore.kernel.org/patchwork/patch/1241077/

 drivers/media/platform/qcom/venus/core.c       | 43 +++++++++++++++++---
 drivers/media/platform/qcom/venus/core.h       |  5 +++
 drivers/media/platform/qcom/venus/pm_helpers.c | 54 ++++++++++++++++++++++++--
 3 files changed, 92 insertions(+), 10 deletions(-)

Comments

Stanimir Varbanov June 18, 2020, 2:54 p.m. UTC | #1 
Hi Rajendra,

On 6/15/20 3:02 PM, Rajendra Nayak wrote:
> Add support to add OPP tables and perf voting on the OPP powerdomain.
> This is needed so venus votes on the corresponding performance state
> for the OPP powerdomain along with setting the core clock rate.
> 
> Signed-off-by: Rajendra Nayak <rnayak@codeaurora.org>
> Reviewed-by: Matthias Kaehlcke <mka@chromium.org>
> Cc: Stanimir Varbanov <stanimir.varbanov@linaro.org>
> Cc: linux-media@vger.kernel.org
> ---
> No functional change in v6, rebased over 5.8-rc1
> Bindings update to add optional PD https://lore.kernel.org/patchwork/patch/1241077/
> 
>  drivers/media/platform/qcom/venus/core.c       | 43 +++++++++++++++++---
>  drivers/media/platform/qcom/venus/core.h       |  5 +++
>  drivers/media/platform/qcom/venus/pm_helpers.c | 54 ++++++++++++++++++++++++--
>  3 files changed, 92 insertions(+), 10 deletions(-)
> 

<cut>

>  
> @@ -740,13 +740,16 @@ static int venc_power_v4(struct device *dev, int on)
>  
>  static int vcodec_domains_get(struct device *dev)
>  {
> +	int ret;
> +	struct opp_table *opp_table;
> +	struct device **opp_virt_dev;
>  	struct venus_core *core = dev_get_drvdata(dev);
>  	const struct venus_resources *res = core->res;
>  	struct device *pd;
>  	unsigned int i;
>  
>  	if (!res->vcodec_pmdomains_num)
> -		return -ENODEV;
> +		goto skip_pmdomains;
>  
>  	for (i = 0; i < res->vcodec_pmdomains_num; i++) {
>  		pd = dev_pm_domain_attach_by_name(dev,
> @@ -763,7 +766,41 @@ static int vcodec_domains_get(struct device *dev)
>  	if (!core->pd_dl_venus)
>  		return -ENODEV;
>  
> +skip_pmdomains:
> +	if (!core->has_opp_table)
> +		return 0;
> +
> +	/* Attach the power domain for setting performance state */
> +	opp_table = dev_pm_opp_attach_genpd(dev, res->opp_pmdomain, &opp_virt_dev);
> +	if (IS_ERR(opp_table)) {
> +		ret = PTR_ERR(opp_table);
> +		goto opp_attach_err;
> +	}
> +
> +	core->opp_pmdomain = *opp_virt_dev;
> +	core->opp_dl_venus = device_link_add(dev, core->opp_pmdomain,
> +					     DL_FLAG_RPM_ACTIVE |
> +					     DL_FLAG_PM_RUNTIME |
> +					     DL_FLAG_STATELESS);
> +	if (!core->opp_dl_venus) {
> +		ret = -ENODEV;
> +		goto opp_dl_add_err;
> +	}
> +
>  	return 0;
> +
> +opp_dl_add_err:
> +	dev_pm_domain_detach(core->opp_pmdomain, true);
> +opp_attach_err:
> +	if (core->pd_dl_venus) {
> +		device_link_del(core->pd_dl_venus);
> +		for (i = 0; i < res->vcodec_pmdomains_num; i++) {
> +			if (IS_ERR_OR_NULL(core->pmdomains[i]))
> +				continue;
> +			dev_pm_domain_detach(core->pmdomains[i], true);
> +		}
> +	}
> +	return ret;
>  }
>  
>  static void vcodec_domains_put(struct device *dev)
> @@ -773,7 +810,7 @@ static void vcodec_domains_put(struct device *dev)
>  	unsigned int i;
>  
>  	if (!res->vcodec_pmdomains_num)
> -		return;
> +		goto skip_pmdomains;
>  
>  	if (core->pd_dl_venus)
>  		device_link_del(core->pd_dl_venus);
> @@ -783,6 +820,15 @@ static void vcodec_domains_put(struct device *dev)
>  			continue;
>  		dev_pm_domain_detach(core->pmdomains[i], true);
>  	}
> +
> +skip_pmdomains:
> +	if (!res->opp_pmdomain)
> +		return;
> +
> +	if (core->opp_dl_venus)
> +		device_link_del(core->opp_dl_venus);
> +
> +	dev_pm_domain_detach(core->opp_pmdomain, true);

Without corresponding changes in venus DT node we call pm_domain_detach
with core->opp_pmdomain = NULL which triggers NULL pointer dereference.

I guess you should check:

	if (core->has_opp_table)
		dev_pm_domain_detach(core->opp_pmdomain, true);

or

	if (core->opp_pmdomain)
		dev_pm_domain_detach(core->opp_pmdomain, true);


... not sure which one is more appropriate or both are.
diff mbox series

Patch

diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
index 203c653..630f61b 100644
--- a/drivers/media/platform/qcom/venus/core.c
+++ b/drivers/media/platform/qcom/venus/core.c
@@ -12,6 +12,7 @@ 
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/types.h>
+#include <linux/pm_opp.h>
 #include <linux/pm_runtime.h>
 #include <media/videobuf2-v4l2.h>
 #include <media/v4l2-mem2mem.h>
@@ -216,21 +217,37 @@  static int venus_probe(struct platform_device *pdev)
 	if (!core->pm_ops)
 		return -ENODEV;
 
+	core->opp_table = dev_pm_opp_set_clkname(dev, "core");
+	if (IS_ERR(core->opp_table))
+		return PTR_ERR(core->opp_table);
+
+	if (core->res->opp_pmdomain) {
+		ret = dev_pm_opp_of_add_table(dev);
+		if (!ret) {
+			core->has_opp_table = true;
+		} else if (ret != -ENODEV) {
+			dev_err(dev, "invalid OPP table in device tree\n");
+			return ret;
+		}
+	}
+
 	if (core->pm_ops->core_get) {
 		ret = core->pm_ops->core_get(dev);
 		if (ret)
-			return ret;
+			goto err_opp_cleanup;
 	}
 
 	ret = dma_set_mask_and_coherent(dev, core->res->dma_mask);
 	if (ret)
-		return ret;
+		goto err_opp_cleanup;
 
 	if (!dev->dma_parms) {
 		dev->dma_parms = devm_kzalloc(dev, sizeof(*dev->dma_parms),
 					      GFP_KERNEL);
-		if (!dev->dma_parms)
-			return -ENOMEM;
+		if (!dev->dma_parms) {
+			ret = -ENOMEM;
+			goto err_opp_cleanup;
+		}
 	}
 	dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
 
@@ -242,11 +259,11 @@  static int venus_probe(struct platform_device *pdev)
 					IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
 					"venus", core);
 	if (ret)
-		return ret;
+		goto err_opp_cleanup;
 
 	ret = hfi_create(core, &venus_core_ops);
 	if (ret)
-		return ret;
+		goto err_opp_cleanup;
 
 	pm_runtime_enable(dev);
 
@@ -302,6 +319,10 @@  static int venus_probe(struct platform_device *pdev)
 	pm_runtime_set_suspended(dev);
 	pm_runtime_disable(dev);
 	hfi_destroy(core);
+err_opp_cleanup:
+	if (core->has_opp_table)
+		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_put_clkname(core->opp_table);
 	return ret;
 }
 
@@ -326,6 +347,10 @@  static int venus_remove(struct platform_device *pdev)
 	pm_runtime_put_sync(dev);
 	pm_runtime_disable(dev);
 
+	if (core->has_opp_table)
+		dev_pm_opp_of_remove_table(dev);
+	dev_pm_opp_put_clkname(core->opp_table);
+
 	if (pm_ops->core_put)
 		pm_ops->core_put(dev);
 
@@ -355,6 +380,10 @@  static __maybe_unused int venus_runtime_suspend(struct device *dev)
 	if (ret)
 		return ret;
 
+	/* Drop the performance state vote */
+	if (core->opp_pmdomain)
+		dev_pm_opp_set_rate(dev, 0);
+
 	if (pm_ops->core_power)
 		ret = pm_ops->core_power(dev, POWER_OFF);
 
@@ -520,6 +549,7 @@  static const struct venus_resources sdm845_res_v2 = {
 	.vcodec_clks_num = 2,
 	.vcodec_pmdomains = { "venus", "vcodec0", "vcodec1" },
 	.vcodec_pmdomains_num = 3,
+	.opp_pmdomain = (const char *[]) { "opp-pd", NULL },
 	.vcodec_num = 2,
 	.max_load = 3110400,	/* 4096x2160@90 */
 	.hfi_version = HFI_VERSION_4XX,
@@ -565,6 +595,7 @@  static const struct venus_resources sc7180_res = {
 	.vcodec_clks_num = 2,
 	.vcodec_pmdomains = { "venus", "vcodec0" },
 	.vcodec_pmdomains_num = 2,
+	.opp_pmdomain = (const char *[]) { "opp-pd", NULL },
 	.vcodec_num = 1,
 	.hfi_version = HFI_VERSION_4XX,
 	.vmem_id = VIDC_RESOURCE_NONE,
diff --git a/drivers/media/platform/qcom/venus/core.h b/drivers/media/platform/qcom/venus/core.h
index 7118612..b0cc544 100644
--- a/drivers/media/platform/qcom/venus/core.h
+++ b/drivers/media/platform/qcom/venus/core.h
@@ -62,6 +62,7 @@  struct venus_resources {
 	unsigned int vcodec_clks_num;
 	const char * const vcodec_pmdomains[VIDC_PMDOMAINS_NUM_MAX];
 	unsigned int vcodec_pmdomains_num;
+	const char **opp_pmdomain;
 	unsigned int vcodec_num;
 	enum hfi_version hfi_version;
 	u32 max_load;
@@ -145,8 +146,12 @@  struct venus_core {
 	struct clk *vcodec1_clks[VIDC_VCODEC_CLKS_NUM_MAX];
 	struct icc_path *video_path;
 	struct icc_path *cpucfg_path;
+	struct opp_table *opp_table;
+	bool has_opp_table;
 	struct device_link *pd_dl_venus;
 	struct device *pmdomains[VIDC_PMDOMAINS_NUM_MAX];
+	struct device_link *opp_dl_venus;
+	struct device *opp_pmdomain;
 	struct video_device *vdev_dec;
 	struct video_device *vdev_enc;
 	struct v4l2_device v4l2_dev;
diff --git a/drivers/media/platform/qcom/venus/pm_helpers.c b/drivers/media/platform/qcom/venus/pm_helpers.c
index abf9315..bfe7421 100644
--- a/drivers/media/platform/qcom/venus/pm_helpers.c
+++ b/drivers/media/platform/qcom/venus/pm_helpers.c
@@ -9,6 +9,7 @@ 
 #include <linux/iopoll.h>
 #include <linux/kernel.h>
 #include <linux/pm_domain.h>
+#include <linux/pm_opp.h>
 #include <linux/pm_runtime.h>
 #include <linux/types.h>
 #include <media/v4l2-mem2mem.h>
@@ -66,10 +67,9 @@  static void core_clks_disable(struct venus_core *core)
 
 static int core_clks_set_rate(struct venus_core *core, unsigned long freq)
 {
-	struct clk *clk = core->clks[0];
 	int ret;
 
-	ret = clk_set_rate(clk, freq);
+	ret = dev_pm_opp_set_rate(core->dev, freq);
 	if (ret)
 		return ret;
 
@@ -740,13 +740,16 @@  static int venc_power_v4(struct device *dev, int on)
 
 static int vcodec_domains_get(struct device *dev)
 {
+	int ret;
+	struct opp_table *opp_table;
+	struct device **opp_virt_dev;
 	struct venus_core *core = dev_get_drvdata(dev);
 	const struct venus_resources *res = core->res;
 	struct device *pd;
 	unsigned int i;
 
 	if (!res->vcodec_pmdomains_num)
-		return -ENODEV;
+		goto skip_pmdomains;
 
 	for (i = 0; i < res->vcodec_pmdomains_num; i++) {
 		pd = dev_pm_domain_attach_by_name(dev,
@@ -763,7 +766,41 @@  static int vcodec_domains_get(struct device *dev)
 	if (!core->pd_dl_venus)
 		return -ENODEV;
 
+skip_pmdomains:
+	if (!core->has_opp_table)
+		return 0;
+
+	/* Attach the power domain for setting performance state */
+	opp_table = dev_pm_opp_attach_genpd(dev, res->opp_pmdomain, &opp_virt_dev);
+	if (IS_ERR(opp_table)) {
+		ret = PTR_ERR(opp_table);
+		goto opp_attach_err;
+	}
+
+	core->opp_pmdomain = *opp_virt_dev;
+	core->opp_dl_venus = device_link_add(dev, core->opp_pmdomain,
+					     DL_FLAG_RPM_ACTIVE |
+					     DL_FLAG_PM_RUNTIME |
+					     DL_FLAG_STATELESS);
+	if (!core->opp_dl_venus) {
+		ret = -ENODEV;
+		goto opp_dl_add_err;
+	}
+
 	return 0;
+
+opp_dl_add_err:
+	dev_pm_domain_detach(core->opp_pmdomain, true);
+opp_attach_err:
+	if (core->pd_dl_venus) {
+		device_link_del(core->pd_dl_venus);
+		for (i = 0; i < res->vcodec_pmdomains_num; i++) {
+			if (IS_ERR_OR_NULL(core->pmdomains[i]))
+				continue;
+			dev_pm_domain_detach(core->pmdomains[i], true);
+		}
+	}
+	return ret;
 }
 
 static void vcodec_domains_put(struct device *dev)
@@ -773,7 +810,7 @@  static void vcodec_domains_put(struct device *dev)
 	unsigned int i;
 
 	if (!res->vcodec_pmdomains_num)
-		return;
+		goto skip_pmdomains;
 
 	if (core->pd_dl_venus)
 		device_link_del(core->pd_dl_venus);
@@ -783,6 +820,15 @@  static void vcodec_domains_put(struct device *dev)
 			continue;
 		dev_pm_domain_detach(core->pmdomains[i], true);
 	}
+
+skip_pmdomains:
+	if (!res->opp_pmdomain)
+		return;
+
+	if (core->opp_dl_venus)
+		device_link_del(core->opp_dl_venus);
+
+	dev_pm_domain_detach(core->opp_pmdomain, true);
 }
 
 static int core_get_v4(struct device *dev)