linux-kernel - Re: [PATCH v3 4/4] clk: qcom: Add graphics clock controller driver for SDM845

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Date:   Mon, 19 Nov 2018 17:02:47 +0530
From:   Taniya Das <tdas@...eaurora.org>
To:     Stephen Boyd <sboyd@...nel.org>,
        Amit Nischal <anischal@...eaurora.org>,
        Michael Turquette <mturquette@...libre.com>
Cc:     Andy Gross <andy.gross@...aro.org>,
        David Brown <david.brown@...aro.org>,
        Rajendra Nayak <rnayak@...eaurora.org>,
        Odelu Kukatla <okukatla@...eaurora.org>,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 4/4] clk: qcom: Add graphics clock controller driver
 for SDM845

Hello Stephen,

On 11/5/2018 12:07 PM, Stephen Boyd wrote:
> Quoting Amit Nischal (2018-08-12 23:33:07)
>> +
>> +static int gpu_cc_sdm845_probe(struct platform_device *pdev)
>> +{
>> +       struct regmap *regmap;
>> +       unsigned int value, mask;
>> +       int ret;
>> +
>> +       regmap = qcom_cc_map(pdev, &gpu_cc_sdm845_desc);
>> +       if (IS_ERR(regmap))
>> +               return PTR_ERR(regmap);
>> +
>> +       clk_fabia_pll_configure(&gpu_cc_pll0, regmap, &gpu_cc_pll0_config);
>> +       clk_fabia_pll_configure(&gpu_cc_pll1, regmap, &gpu_cc_pll1_config);
>> +
>> +       /*
>> +        * Configure gpu_cc_cx_gmu_clk with recommended
>> +        * wakeup/sleep settings
>> +        */
>> +       mask = CX_GMU_CBCR_WAKE_MASK << CX_GMU_CBCR_WAKE_SHIFT;
>> +       mask |= CX_GMU_CBCR_SLEEP_MASK << CX_GMU_CBCR_SLEEP_SHIFT;
>> +       value = 0xf << CX_GMU_CBCR_WAKE_SHIFT | 0xf << CX_GMU_CBCR_SLEEP_SHIFT;
>> +       regmap_update_bits(regmap, 0x1098, mask, value);
>> +
>> +       ret = qcom_cc_really_probe(pdev, &gpu_cc_sdm845_desc, regmap);
>> +       if (ret)
>> +               return ret;
>> +
>> +       /* Configure clk_dis_wait for gpu_cx_gdsc */
>> +       regmap_update_bits(regmap, 0x106c, CLK_DIS_WAIT_MASK,
>> +                                               8 << CLK_DIS_WAIT_SHIFT);
> 
> Is there a reason this is done after clks are registered? I'd think we
> would want to do it before.
> 

Yes, it could be done before, would move it.

>> +
>> +       /* Set supported range of frequencies for gfx3d clock */
>> +       clk_hw_set_rate_range(&gpu_cc_gx_gfx3d_clk_src.clkr.hw, 180000000,
>> +                                                               710000000);
>> +
>> +       return 0;
>> +}

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