linux-kernel - Re: [PATCH 3/5] clk: qcom: gpucc-sc7280: Add cx collapse reset support

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Message-ID: <9098554e-5327-0b7f-f4d0-a81880556136@linaro.org>
Date:   Tue, 2 Aug 2022 10:15:27 +0300
From:   Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To:     Akhil P Oommen <quic_akhilpo@...cinc.com>,
        freedreno <freedreno@...ts.freedesktop.org>,
        dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        Rob Clark <robdclark@...il.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Stephen Boyd <swboyd@...omium.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Andy Gross <agross@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/5] clk: qcom: gpucc-sc7280: Add cx collapse reset
 support

On 30/07/2022 12:17, Akhil P Oommen wrote:
> Allow a consumer driver to poll for cx gdsc collapse through Reset
> framework.
> 
> Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
> ---
> 
>   drivers/clk/qcom/gpucc-sc7280.c | 6 ++++++
>   1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/clk/qcom/gpucc-sc7280.c b/drivers/clk/qcom/gpucc-sc7280.c
> index 9a832f2..f5df51d 100644
> --- a/drivers/clk/qcom/gpucc-sc7280.c
> +++ b/drivers/clk/qcom/gpucc-sc7280.c
> @@ -433,12 +433,18 @@ static const struct regmap_config gpu_cc_sc7280_regmap_config = {
>   	.fast_io = true,
>   };
>   
> +static const struct qcom_reset_map gpucc_sc7280_resets[] = {
> +	[GPU_CX_COLLAPSE] = { .op = gdsc_wait_for_collapse, .priv = &cx_gdsc },
> +};
> +
>   static const struct qcom_cc_desc gpu_cc_sc7280_desc = {
>   	.config = &gpu_cc_sc7280_regmap_config,
>   	.clks = gpu_cc_sc7280_clocks,
>   	.num_clks = ARRAY_SIZE(gpu_cc_sc7280_clocks),
>   	.gdscs = gpu_cc_sc7180_gdscs,
>   	.num_gdscs = ARRAY_SIZE(gpu_cc_sc7180_gdscs),
> +	.resets = gpucc_sc7280_resets,
> +	.num_resets = ARRAY_SIZE(gpucc_sc7280_resets),

An implementation question. Do we have to poll for the GDSC on platforms 
like sm8150/sm8250 which have the plain BCR resets?

>   };
>   
>   static const struct of_device_id gpu_cc_sc7280_match_table[] = {


-- 
With best wishes
Dmitry