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Date: Thu, 23 Jul 2020 17:07:01 +0530
From: Rajendra Nayak <rnayak@...eaurora.org>
To: Stanimir Varbanov <stanimir.varbanov@...aro.org>,
robh+dt@...nel.org, agross@...nel.org, bjorn.andersson@...aro.org
Cc: linux-arm-msm@...r.kernel.org, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
mka@...omium.org
Subject: Re: [PATCH v3 2/4] media: venus: core: Add support for opp
tables/perf voting
Hey Stan,
On 7/22/2020 1:57 PM, Stanimir Varbanov wrote:
> Hi Rajendra,
>
> Thanks for the patch!
>
> Sorry for last minute comments.
Thanks for reviewing the patch, I have addressed all your
review feedback from below and repostd a v4 now [1]
cheers,
Rajendra
[1] https://lore.kernel.org/patchwork/project/lkml/list/?series=454732
>
> On 7/20/20 10:07 AM, 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@...eaurora.org>
>> Reviewed-by: Matthias Kaehlcke <mka@...omium.org>
>> ---
>> 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(-)
>>
>> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
>> index 203c653..b9f61a6 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;
>> + }
>> + }
>> +
>
> Can we move those dev_pm_opp_xxx invocations into pm_ops->core_get where
> the other pmdomains are? The pm_ops abstarction is created exactly for
> such pm and clks manipulations.
>
>> 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);
>
> this also belongs to pm_ops->core_put but it is missing in the .probe
> error path.
>
> + if (core->pm_ops->core_put)
> + core->pm_ops->core_put(dev);
>
> above addition should be separate patch I guess.
>
>> 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);
>> +
>
> those also should be moved to core_put
>
>> 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);
>> +
>
> move this in core_power(OFF)
>
>> 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 *[]) { "cx", 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 *[]) { "cx", 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..4149ab8 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 (!core->has_opp_table)
>> + 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)
>>
>
--
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