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

Matthias Kaehlcke
2020-04-29T00:39:11Z

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@codeaurora.org>
> Cc: Stanimir Varbanov <stanimir.varbanov@linaro.org>
> Cc: linux-media@vger.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