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

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Date:   Tue, 09 May 2023 18:57:02 +0200
From:   Luca Weiss <luca@...tu.xyz>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        ~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>,
        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] clk: qcom: mmcc-msm8974: Add OXILICX_GDSC for msm8226

On Montag, 8. Mai 2023 13:35:07 CEST Konrad Dybcio wrote:
> On 8.05.2023 13:32, Dmitry Baryshkov wrote:
> > On 08/05/2023 10:23, Konrad Dybcio wrote:
> >> 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,
> >>   };
> > 
> > Are you declaring oxili_gdsc to be a parent of itself?
> 
> lol.. nice catch of course this line should have been
> 
> +       .parent = &oxilicx_gdsc.pd,
> 
> and the definitions would need to be swapped

The 0x4024 oxili_gdsc (downstream name gdsc_oxili_gx) is disabled in 8226 dts.

Only in downstream msm8974.dtsi this gdsc gets "parent-supply = 
<&pm8841_s4_corner>;", on 8226 there's no parent-supply. And the gdsc parent 
doesn't even seem to be described there.

Should I still try?

> 
> Konrad
> 
> >>   @@ -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,