On Wed, 3 Apr 2024 at 13:49, Ajit Pandey <quic_ajipan@xxxxxxxxxxx> wrote:
>
>
>
> On 4/3/2024 12:53 AM, Dmitry Baryshkov wrote:
> > On Tue, 2 Apr 2024 at 21:26, Ajit Pandey <quic_ajipan@xxxxxxxxxxx> wrote:
> >>
> >>
> >>
> >> On 3/31/2024 7:09 AM, Dmitry Baryshkov wrote:
> >>> On Sat, 30 Mar 2024 at 20:30, Ajit Pandey <quic_ajipan@xxxxxxxxxxx> wrote:
> >>>>
> >>>> Add Graphics Clock Controller (GPUCC) support for SM4450 platform.
> >>>>
> >>>> Signed-off-by: Ajit Pandey <quic_ajipan@xxxxxxxxxxx>
> >>>> ---
> >>>> drivers/clk/qcom/Kconfig | 9 +
> >>>> drivers/clk/qcom/Makefile | 1 +
> >>>> drivers/clk/qcom/gpucc-sm4450.c | 806 ++++++++++++++++++++++++++++++++
> >>>> 3 files changed, 816 insertions(+)
> >>>> create mode 100644 drivers/clk/qcom/gpucc-sm4450.c
> >>>>
> >>>
> >>> [skipped]
> >>>
> >>>> +static int gpu_cc_sm4450_probe(struct platform_device *pdev)
> >>>> +{
> >>>> + struct regmap *regmap;
> >>>> +
> >>>> + regmap = qcom_cc_map(pdev, &gpu_cc_sm4450_desc);
> >>>> + if (IS_ERR(regmap))
> >>>> + return PTR_ERR(regmap);
> >>>> +
> >>>> + clk_lucid_evo_pll_configure(&gpu_cc_pll0, regmap, &gpu_cc_pll0_config);
> >>>> + clk_lucid_evo_pll_configure(&gpu_cc_pll1, regmap, &gpu_cc_pll1_config);
> >>>> +
> >>>> + /* Keep some clocks always enabled */
> >>>> + qcom_branch_set_clk_en(regmap, 0x93a4); /* GPU_CC_CB_CLK */
> >>>> + qcom_branch_set_clk_en(regmap, 0x9004); /* GPU_CC_CXO_AON_CLK */
> >>>> + qcom_branch_set_clk_en(regmap, 0x900c); /* GPU_CC_DEMET_CLK */
> >>>
> >>> Why? At least other drivers model these three clocks properly.
> >>>
> >> These clocks are POR on in SM4450 and required to be kept always enabled
> >> for GPU functionality hence keep them enabled from probe only.
> >
> > Please, check how this is handled on the other platforms, please.
> > Hint: `git grep GPU_CC_DEMET_CLK`
> >
> yeah these clocks are modeled and handled via always enabled clk ops
> (clk_branch2_aon_ops) in few other platforms like SM8450, SM8650 which
> also do same functionality and keep them in always enabled POR state,
> while we kept them enabled from GPUCC probe in SM8550.
> Since we need such clock to be always enabled irrespective of consumer
> votes I guess modeling with aon_ops isn't really required and we can
> simply keep them enabled in probe similar to other always on clocks.
Why are they required to be kept on even if there is no consumer?
> >>
> >>>> +
> >>>> + return qcom_cc_really_probe(pdev, &gpu_cc_sm4450_desc, regmap);
> >>>> +}
> >>>> +
> >>>> +static struct platform_driver gpu_cc_sm4450_driver = {
> >>>> + .probe = gpu_cc_sm4450_probe,
> >>>> + .driver = {
> >>>> + .name = "gpucc-sm4450",
> >>>> + .of_match_table = gpu_cc_sm4450_match_table,
> >>>> + },
> >>>> +};
> >>>> +
> >>>> +module_platform_driver(gpu_cc_sm4450_driver);
> >>>> +
> >>>> +MODULE_DESCRIPTION("QTI GPUCC SM4450 Driver");
> >>>> +MODULE_LICENSE("GPL");
> >>>> --
> >>>> 2.25.1
> >>>>
> >>>>
> >>>
> >>>
> >>
> >> --
> >> Thanks, and Regards
> >> Ajit
> >
> >
> >
>
> --
> Thanks, and Regards
> Ajit
--
With best wishes
Dmitry
