linux-kernel - Re: [PATCH v3 12/17] media: venus: core: Add support for opp tables/perf voting

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Message-ID: <20200429003907.GN4525@google.com>
Date:   Tue, 28 Apr 2020 17:39:07 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Rajendra Nayak <rnayak@...eaurora.org>
Cc:     viresh.kumar@...aro.org, sboyd@...nel.org,
        bjorn.andersson@...aro.org, agross@...nel.org,
        linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>,
        linux-media@...r.kernel.org
Subject: Re: [PATCH v3 12/17] media: venus: core: Add support for opp
 tables/perf voting

On Tue, Apr 28, 2020 at 07:03:00PM +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@...eaurora.org>
> Cc: Stanimir Varbanov <stanimir.varbanov@...aro.org>
> Cc: linux-media@...r.kernel.org
> ---
>  drivers/media/platform/qcom/venus/core.c       | 28 +++++++++++++++++++
>  drivers/media/platform/qcom/venus/core.h       |  5 ++++
>  drivers/media/platform/qcom/venus/pm_helpers.c | 37 +++++++++++++++++++++++---
>  3 files changed, 66 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/venus/core.c b/drivers/media/platform/qcom/venus/core.c
> index 194b10b9..e98fea92 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>
> @@ -214,6 +215,20 @@ 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)
> @@ -301,6 +316,9 @@ static int venus_probe(struct platform_device *pdev)
>  err_venus_shutdown:
>  	venus_shutdown(core);
>  err_runtime_disable:
> +	if (core->res->opp_pmdomain && core->has_opp_table)

the check for 'core->res->opp_pmdomain' is not needed, 'core->has_opp_table'
can only be true when 'core->res->opp_pmdomain' is not NULL.

> +		dev_pm_opp_of_remove_table(dev);
> +	dev_pm_opp_put_clkname(core->opp_table);
>  	pm_runtime_set_suspended(dev);
>  	pm_runtime_disable(dev);
>  	hfi_destroy(core);
> @@ -326,6 +344,10 @@ static int venus_remove(struct platform_device *pdev)
>  
>  	venus_firmware_deinit(core);
>  
> +	if (core->res->opp_pmdomain && core->has_opp_table)

ditto