linux-kernel - Re: [PATCH 4/4] clk: qcom: gpucc-sm6350: Add *_wait

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Message-ID: <c1b23184-396b-4c6f-a890-9e08bf564eec@oss.qualcomm.com>
Date: Mon, 28 Apr 2025 23:11:05 +0530
From: Taniya Das <taniya.das@....qualcomm.com>
To: Luca Weiss <luca.weiss@...rphone.com>,
        Bjorn Andersson <andersson@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd
 <sboyd@...nel.org>,
        Konrad Dybcio <konradybcio@...nel.org>,
        AngeloGioacchino Del Regno <angelogioacchino.delregno@...ainline.org>
Cc: ~postmarketos/upstreaming@...ts.sr.ht, phone-devel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] clk: qcom: gpucc-sm6350: Add *_wait_val values for
 GDSCs



On 4/25/2025 5:42 PM, Luca Weiss wrote:
> Compared to the msm-4.19 driver the mainline GDSC driver always sets the
> bits for en_rest, en_few & clk_dis, and if those values are not set
> per-GDSC in the respective driver then the default value from the GDSC
> driver is used. The downstream driver only conditionally sets
> clk_dis_wait_val if qcom,clk-dis-wait-val is given in devicetree.
> 
> Correct this situation by explicitly setting those values. For all GDSCs
> the reset value of those bits are used, with the exception of
> gpu_cx_gdsc which has an explicit value (qcom,clk-dis-wait-val = <8>).
> 
> Fixes: 013804a727a0 ("clk: qcom: Add GPU clock controller driver for SM6350")
> Signed-off-by: Luca Weiss <luca.weiss@...rphone.com>
> ---
>  drivers/clk/qcom/gpucc-sm6350.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/clk/qcom/gpucc-sm6350.c b/drivers/clk/qcom/gpucc-sm6350.c
> index 35ed0500bc59319f9659aef81031b34d29fc06a4..ee89c42413f885f21f1470b1f7887d052e52a75e 100644
> --- a/drivers/clk/qcom/gpucc-sm6350.c
> +++ b/drivers/clk/qcom/gpucc-sm6350.c
> @@ -413,6 +413,9 @@ static struct clk_branch gpu_cc_gx_vsense_clk = {
>  static struct gdsc gpu_cx_gdsc = {
>  	.gdscr = 0x106c,
>  	.gds_hw_ctrl = 0x1540,
> +	.en_rest_wait_val = 0x2,
> +	.en_few_wait_val = 0x2,
> +	.clk_dis_wait_val = 0x8,
>  	.pd = {
>  		.name = "gpu_cx_gdsc",
>  	},
> @@ -423,6 +426,9 @@ static struct gdsc gpu_cx_gdsc = {
>  static struct gdsc gpu_gx_gdsc = {
>  	.gdscr = 0x100c,
>  	.clamp_io_ctrl = 0x1508,
> +	.en_rest_wait_val = 0x2,
> +	.en_few_wait_val = 0x2,
> +	.clk_dis_wait_val = 0x2,
>  	.pd = {
>  		.name = "gpu_gx_gdsc",
>  		.power_on = gdsc_gx_do_nothing_enable,
> 

Reviewed-by: Taniya Das <quic_tdas@...cinc.com>