Re: [PATCH v5 5/6] media: venus: core: Add support for opp tables/perf voting

From: Matthias Kaehlcke
Date: Wed May 13 2020 - 14:41:31 EST

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In reply to: Rajendra Nayak: "[PATCH v5 5/6] media: venus: core: Add support for opp tables/perf voting"
Next in thread: Rajendra Nayak: "[PATCH v5 6/6] spi: spi-qcom-qspi: Use OPP API to set clk/perf state"
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On Wed, May 13, 2020 at 04:43:01PM +0530, 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@xxxxxxxxxxxxxx>
> Cc: Stanimir Varbanov <stanimir.varbanov@xxxxxxxxxx>
> Cc: linux-media@xxxxxxxxxxxxxxx
> ---
> Changes in v5: Fixed up error handling in probe and vcodec_domains_get()
> Bindings update to add optional PD https://lore.kernel.org/patchwork/patch/1241077/
>
> drivers/media/platform/qcom/venus/core.c | 45 +++++++++++++++++----
> drivers/media/platform/qcom/venus/core.h | 5 +++
> drivers/media/platform/qcom/venus/pm_helpers.c | 54 ++++++++++++++++++++++++--
> 3 files changed, 93 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 194b10b9..2a8ff08 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>
> @@ -214,21 +215,37 @@ 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));
>
> @@ -240,15 +257,15 @@ static int venus_probe(struct platform_device *pdev)
> IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
> "venus", core);
> if (ret)
> - return ret;
> + goto err_opp_cleanup;
>
> ret = icc_set_bw(core->cpucfg_path, 0, kbps_to_icc(1000));
> 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);
>
> @@ -304,6 +321,10 @@ 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;
> }
>
> @@ -329,6 +350,10 @@ 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);
>
> @@ -350,6 +375,10 @@ 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);
>
> @@ -511,6 +540,7 @@ 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,
> @@ -556,6 +586,7 @@ 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 bd3ac6a..cc1d511 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;
> @@ -144,8 +145,12 @@ 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)

Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>

Next message: Paul E. McKenney: "Re: [PATCH 10/10] rcu: Nocb (de)activate through sysfs"
Previous message: Paul E. McKenney: "Re: [PATCH 09/10] rcu: Allow to re-offload a CPU that used to be nocb"
In reply to: Rajendra Nayak: "[PATCH v5 5/6] media: venus: core: Add support for opp tables/perf voting"
Next in thread: Rajendra Nayak: "[PATCH v5 6/6] spi: spi-qcom-qspi: Use OPP API to set clk/perf state"
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