linux-kernel - Re: [PATCH v3 02/15] clk: qcom: Use qcom_branch_set_clk

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Date: Wed, 20 Dec 2023 09:25:14 +0100
From: Johan Hovold <johan@...nel.org>
To: Konrad Dybcio <konrad.dybcio@...aro.org>
Cc: Bjorn Andersson <andersson@...nel.org>, Andy Gross <agross@...nel.org>,
	Michael Turquette <mturquette@...libre.com>,
	Stephen Boyd <sboyd@...nel.org>, Rob Herring <robh+dt@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>,
	Marijn Suijten <marijn.suijten@...ainline.org>,
	linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
	linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
	Bryan O'Donoghue <bryan.odonoghue@...aro.org>
Subject: Re: [PATCH v3 02/15] clk: qcom: Use qcom_branch_set_clk_en()

On Wed, Dec 20, 2023 at 01:30:43AM +0100, Konrad Dybcio wrote:
> Instead of magically poking at the bit0 of branch clocks' CBCR, use
> the newly introduced helper.
> 
> Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
> Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>

> diff --git a/drivers/clk/qcom/gcc-sc8280xp.c b/drivers/clk/qcom/gcc-sc8280xp.c
> index bfb77931e868..1ba78990b9f4 100644
> --- a/drivers/clk/qcom/gcc-sc8280xp.c
> +++ b/drivers/clk/qcom/gcc-sc8280xp.c
> @@ -7543,21 +7543,15 @@ static int gcc_sc8280xp_probe(struct platform_device *pdev)
>  		goto err_put_rpm;
>  	}
>  
> -	/*
> -	 * Keep the clocks always-ON

I think you should keep this part of the comment in some form
throughout, for example:

	/* Keep some clocks always on */
	qcom_branch_set_clk_en(...);
	...

> -	 * GCC_CAMERA_AHB_CLK, GCC_CAMERA_XO_CLK, GCC_DISP_AHB_CLK,
> -	 * GCC_DISP_XO_CLK, GCC_GPU_CFG_AHB_CLK, GCC_VIDEO_AHB_CLK,
> -	 * GCC_VIDEO_XO_CLK, GCC_DISP1_AHB_CLK, GCC_DISP1_XO_CLK
> -	 */
> -	regmap_update_bits(regmap, 0x26004, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0x26020, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0x27004, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0x27028, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0x71004, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0x28004, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0x28028, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0xbb004, BIT(0), BIT(0));
> -	regmap_update_bits(regmap, 0xbb028, BIT(0), BIT(0));
> +	qcom_branch_set_clk_en(regmap, 0x26004); /* GCC_CAMERA_AHB_CLK */
> +	qcom_branch_set_clk_en(regmap, 0x26020); /* GCC_CAMERA_XO_CLK */
> +	qcom_branch_set_clk_en(regmap, 0x27004); /* GCC_DISP_AHB_CLK */
> +	qcom_branch_set_clk_en(regmap, 0x27028); /* GCC_DISP_XO_CLK */
> +	qcom_branch_set_clk_en(regmap, 0x71004); /* GCC_GPU_CFG_AHB_CLK */
> +	qcom_branch_set_clk_en(regmap, 0x28004); /* GCC_VIDEO_AHB_CLK */
> +	qcom_branch_set_clk_en(regmap, 0x28028); /* GCC_VIDEO_XO_CLK */
> +	qcom_branch_set_clk_en(regmap, 0xbb004); /* GCC_DISP1_AHB_CLK */
> +	qcom_branch_set_clk_en(regmap, 0xbb028); /* GCC_DISP1_XO_CLK */
>  
>  	ret = qcom_cc_register_rcg_dfs(regmap, gcc_dfs_clocks, ARRAY_SIZE(gcc_dfs_clocks));
>  	if (ret)

Johan