linux-kernel - Re: [PATCH 3/4] clk: qcom: dispcc-sm8550: fix DisplayPort clocks

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Date: Wed, 10 Apr 2024 18:26:57 +0200
From: Neil Armstrong <neil.armstrong@...aro.org>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
 Bjorn Andersson <andersson@...nel.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Konrad Dybcio <konrad.dybcio@...ainline.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 3/4] clk: qcom: dispcc-sm8550: fix DisplayPort clocks

On 08/04/2024 13:47, Dmitry Baryshkov wrote:
> On SM8550 DisplayPort link clocks use frequency tables inherited from
> the vendor kernel, it is not applicable in the upstream kernel. Drop
> frequency tables and use clk_byte2_ops for those clocks.
> 
> Fixes: 90114ca11476 ("clk: qcom: add SM8550 DISPCC driver")
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> ---
>   drivers/clk/qcom/dispcc-sm8550.c | 20 ++++----------------
>   1 file changed, 4 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/clk/qcom/dispcc-sm8550.c b/drivers/clk/qcom/dispcc-sm8550.c
> index 3672c73ac11c..38ecea805503 100644
> --- a/drivers/clk/qcom/dispcc-sm8550.c
> +++ b/drivers/clk/qcom/dispcc-sm8550.c
> @@ -345,26 +345,17 @@ static struct clk_rcg2 disp_cc_mdss_dptx0_aux_clk_src = {
>   	},
>   };
>   
> -static const struct freq_tbl ftbl_disp_cc_mdss_dptx0_link_clk_src[] = {
> -	F(162000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> -	F(270000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> -	F(540000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> -	F(810000, P_DP0_PHY_PLL_LINK_CLK, 1, 0, 0),
> -	{ }
> -};
> -
>   static struct clk_rcg2 disp_cc_mdss_dptx0_link_clk_src = {
>   	.cmd_rcgr = 0x8170,
>   	.mnd_width = 0,
>   	.hid_width = 5,
>   	.parent_map = disp_cc_parent_map_7,
> -	.freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
>   	.clkr.hw.init = &(struct clk_init_data) {
>   		.name = "disp_cc_mdss_dptx0_link_clk_src",
>   		.parent_data = disp_cc_parent_data_7,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_7),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_byte2_ops,
>   	},
>   };
>   
> @@ -418,13 +409,12 @@ static struct clk_rcg2 disp_cc_mdss_dptx1_link_clk_src = {
>   	.mnd_width = 0,
>   	.hid_width = 5,
>   	.parent_map = disp_cc_parent_map_3,
> -	.freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
>   	.clkr.hw.init = &(struct clk_init_data) {
>   		.name = "disp_cc_mdss_dptx1_link_clk_src",
>   		.parent_data = disp_cc_parent_data_3,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_byte2_ops,
>   	},
>   };
>   
> @@ -478,13 +468,12 @@ static struct clk_rcg2 disp_cc_mdss_dptx2_link_clk_src = {
>   	.mnd_width = 0,
>   	.hid_width = 5,
>   	.parent_map = disp_cc_parent_map_3,
> -	.freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
>   	.clkr.hw.init = &(struct clk_init_data) {
>   		.name = "disp_cc_mdss_dptx2_link_clk_src",
>   		.parent_data = disp_cc_parent_data_3,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_byte2_ops,
>   	},
>   };
>   
> @@ -538,13 +527,12 @@ static struct clk_rcg2 disp_cc_mdss_dptx3_link_clk_src = {
>   	.mnd_width = 0,
>   	.hid_width = 5,
>   	.parent_map = disp_cc_parent_map_3,
> -	.freq_tbl = ftbl_disp_cc_mdss_dptx0_link_clk_src,
>   	.clkr.hw.init = &(struct clk_init_data) {
>   		.name = "disp_cc_mdss_dptx3_link_clk_src",
>   		.parent_data = disp_cc_parent_data_3,
>   		.num_parents = ARRAY_SIZE(disp_cc_parent_data_3),
>   		.flags = CLK_SET_RATE_PARENT,
> -		.ops = &clk_rcg2_ops,
> +		.ops = &clk_byte2_ops,
>   	},
>   };
>   
> 

Reviewed-by: Neil Armstrong <neil.armstrong@...aro.org>
Tested-by: Neil Armstrong <neil.armstrong@...aro.org> # on SM8550-HDK

Fixes the:
[   25.428008] msm-dp-display ae90000.displayport-controller: _opp_config_clk_single: failed to set clock rate: -22

Thanks !

Neil