linux-kernel - Re: [PATCH 1/5] clk: qcom: dispcc-sm8650: Park RCG's clk source at XO during disable

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Date: Fri, 21 Jun 2024 22:26:30 +0530
From: Taniya Das <quic_tdas@...cinc.com>
To: Neil Armstrong <neil.armstrong@...aro.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen
 Boyd <sboyd@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>
CC: <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/5] clk: qcom: dispcc-sm8650: Park RCG's clk source at XO
 during disable



On 6/21/2024 7:31 PM, Neil Armstrong wrote:
> The RCG's clk src has to be parked at XO while disabling as per the
> HW recommendation, hence use clk_rcg2_shared_ops to achieve the same.
> 
> Fixes: 9e939f008338 ("clk: qcom: add the SM8650 Display Clock Controller driver")
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>   drivers/clk/qcom/dispcc-sm8650.c | 16 ++++++++--------
>   1 file changed, 8 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/clk/qcom/dispcc-sm8650.c b/drivers/clk/qcom/dispcc-sm8650.c
> index c9d2751f5cb8..31c82f791b44 100644
> --- a/drivers/clk/qcom/dispcc-sm8650.c
> +++ b/drivers/clk/qcom/dispcc-sm8650.c
> @@ -339,7 +339,7 @@ static struct clk_rcg2 disp_cc_mdss_dptx0_aux_clk_src = {
>   		.parent_data = disp_cc_parent_data_0,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_0),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
>   };
>   
> @@ -457,7 +457,7 @@ static struct clk_rcg2 disp_cc_mdss_dptx2_aux_clk_src = {
>   		.parent_data = disp_cc_parent_data_0,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_0),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
>   };
>   
> @@ -516,7 +516,7 @@ static struct clk_rcg2 disp_cc_mdss_dptx3_aux_clk_src = {
>   		.parent_data = disp_cc_parent_data_0,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_0),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
>   };
>   
> @@ -560,7 +560,7 @@ static struct clk_rcg2 disp_cc_mdss_esc0_clk_src = {
>   		.parent_data = disp_cc_parent_data_5,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_5),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
>   };
>   
> @@ -575,7 +575,7 @@ static struct clk_rcg2 disp_cc_mdss_esc1_clk_src = {
>   		.parent_data = disp_cc_parent_data_5,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_5),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
>   };
>   
> @@ -647,7 +647,7 @@ static struct clk_rcg2 disp_cc_mdss_vsync_clk_src = {
>   		.parent_data = disp_cc_parent_data_0,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_0),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
>   };
>   
> @@ -667,7 +667,7 @@ static struct clk_rcg2 disp_cc_sleep_clk_src = {
>   		.parent_data = disp_cc_parent_data_9,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_9),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
Technically not required for this RCG as the source is sleep clock.
>   };
>   
> @@ -682,7 +682,7 @@ static struct clk_rcg2 disp_cc_xo_clk_src = {
>   		.parent_data = disp_cc_parent_data_0_ao,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_0_ao),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_rcg2_shared_ops,
>   	},
>   };
This RCG supports only XO frequency and can be ignored.
>   
> 

-- 
Thanks & Regards,
Taniya Das.