linux-kernel - Re: [PATCH] clk: qcom: mmcc-msm8974: Add OXILICX

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Date:   Mon, 8 May 2023 09:23:02 +0200
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     Luca Weiss <luca@...tu.xyz>, ~postmarketos/upstreaming@...ts.sr.ht,
        phone-devel@...r.kernel.org,
        Bjorn Andersson <andersson@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Michael Turquette <mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        Bartosz Dudziak <bartosz.dudziak@...jp.pl>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: mmcc-msm8974: Add OXILICX_GDSC for msm8226



On 6.05.2023 23:20, Luca Weiss wrote:
> On msm8226 we also have OXILICX_GDSC but we need a slighly different
> config, with a .cxcs defined for clock but with no parent.
Hm, on newer (a5xx+) GPUs, CX needs to be turned on first and
to achieve that, we sometimes define it to be the GX's (also
implicitly known as "oxili-non-CX" in before-a6xx-times) parent..

Roughly speaking CX powers the "GPU hardware owned by the broader
SoC that may not need the GPU core clock to be up" and GX powers
the "GPU hardware owned strictly by the GPU that needs at least some
GPU clocks to be enabled"

Maybe 8974 simply has a bug in the driver that would do the reverse?
Could you (and perhaps Dmitry on his shiny new 13yo board) test that
theory, preferably on both SoCs?

--- a/drivers/clk/qcom/mmcc-msm8974.c
+++ b/drivers/clk/qcom/mmcc-msm8974.c
@@ -2431,6 +2431,7 @@ static struct gdsc oxili_gdsc = {
        .pd = {
                .name = "oxili",
        },
+       .parent = &oxili_gdsc.pd,
        .pwrsts = PWRSTS_OFF_ON,
 };
 
@@ -2439,7 +2440,6 @@ static struct gdsc oxilicx_gdsc = {
        .pd = {
                .name = "oxilicx",
        },
-       .parent = &oxili_gdsc.pd,
        .pwrsts = PWRSTS_OFF_ON,
 };

Konrad
> 
> Signed-off-by: Luca Weiss <luca@...tu.xyz>
> ---
>  drivers/clk/qcom/mmcc-msm8974.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/clk/qcom/mmcc-msm8974.c b/drivers/clk/qcom/mmcc-msm8974.c
> index 4273fce9a4a4..39ee3953567c 100644
> --- a/drivers/clk/qcom/mmcc-msm8974.c
> +++ b/drivers/clk/qcom/mmcc-msm8974.c
> @@ -2443,6 +2443,16 @@ static struct gdsc oxilicx_gdsc = {
>  	.pwrsts = PWRSTS_OFF_ON,
>  };
>  
> +static struct gdsc oxilicx_gdsc_msm8226 = {
> +	.gdscr = 0x4034,
> +	.cxcs = (unsigned int []){ 0x4028 },
> +	.cxc_count = 1,
> +	.pd = {
> +		.name = "oxilicx",
> +	},
> +	.pwrsts = PWRSTS_OFF_ON,
> +};
> +
>  static struct clk_regmap *mmcc_msm8226_clocks[] = {
>  	[MMSS_AHB_CLK_SRC] = &mmss_ahb_clk_src.clkr,
>  	[MMSS_AXI_CLK_SRC] = &mmss_axi_clk_src.clkr,
> @@ -2533,6 +2543,7 @@ static struct gdsc *mmcc_msm8226_gdscs[] = {
>  	[MDSS_GDSC] = &mdss_gdsc,
>  	[CAMSS_JPEG_GDSC] = &camss_jpeg_gdsc,
>  	[CAMSS_VFE_GDSC] = &camss_vfe_gdsc,
> +	[OXILICX_GDSC] = &oxilicx_gdsc_msm8226,
>  };
>  
>  static const struct regmap_config mmcc_msm8226_regmap_config = {
> 
> ---
> base-commit: dd9e11d6477a52ede9ebe575c83285e79e823889
> change-id: 20230506-msm8226-oxilicx-7f3f0f8e491d
> 
> Best regards,