linux-kernel - Re: [PATCH v2] clk: qcom: apss-ipq-pll: use stromer ops for IPQ5018 to fix boot failure

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Message-ID: <7d0e81fd-8cc2-46f2-bc12-759a0d48e3ae@quicinc.com>
Date: Mon, 18 Mar 2024 11:09:52 +0530
From: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
To: Gabor Juhos <j4g8y7@...il.com>, Bjorn Andersson <andersson@...nel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Michael Turquette
	<mturquette@...libre.com>,
        Stephen Boyd <sboyd@...nel.org>,
        "Sricharan
 Ramabadhran" <quic_srichara@...cinc.com>,
        Dmitry Baryshkov
	<dmitry.baryshkov@...aro.org>,
        Gokul Sriram Palanisamy
	<quic_gokulsri@...cinc.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <stable@...r.kernel.org>
Subject: Re: [PATCH v2] clk: qcom: apss-ipq-pll: use stromer ops for IPQ5018
 to fix boot failure



On 3/15/2024 9:46 PM, Gabor Juhos wrote:
> Booting v6.8 results in a hang on various IPQ5018 based boards.
> Investigating the problem showed that the hang happens when the
> clk_alpha_pll_stromer_plus_set_rate() function tries to write
> into the PLL_MODE register of the APSS PLL.
> 
> Checking the downstream code revealed that it uses [1] stromer
> specific operations for IPQ5018, whereas in the current code
> the stromer plus specific operations are used.
> 
> The ops in the 'ipq_pll_stromer_plus' clock definition can't be
> changed since that is needed for IPQ5332, so add a new alpha pll
> clock declaration which uses the correct stromer ops and use this
> new clock for IPQ5018 to avoid the boot failure.
> 
> Also, change pll_type in 'ipq5018_pll_data' to
> CLK_ALPHA_PLL_TYPE_STROMER to better reflect that it is a Stromer
> PLL and change the apss_ipq_pll_probe() function accordingly.
> 
> 1. https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.4/drivers/clk/qcom/apss-ipq5018.c#L67
> 
> Cc: stable@...r.kernel.org
> Fixes: 50492f929486 ("clk: qcom: apss-ipq-pll: add support for IPQ5018")
> Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
> ---
> Changes in v2:
>    - extend commit description due to the changes
>    - add a comment about why CLK_ALPHA_PLL_TYPE_STROMER_PLUS register offsets
>      are used
>    - constify hw clock init data (Stephen)
>    - change pll_type in ipq5018_pll_data to CLK_ALPHA_PLL_TYPE_STROMER (Konrad)
>    - Link to v1: https://lore.kernel.org/r/20240311-apss-ipq-pll-ipq5018-hang-v1-1-8ed42b7a904d@gmail.com


I don't see a reason why my tags are dropped, nevertheless

Tested-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>
Reviewed-by: Kathiravan Thirumoorthy <quic_kathirav@...cinc.com>


> ---
> Based on v6.8.
> ---
>   drivers/clk/qcom/apss-ipq-pll.c | 30 +++++++++++++++++++++++++++---
>   1 file changed, 27 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/clk/qcom/apss-ipq-pll.c b/drivers/clk/qcom/apss-ipq-pll.c
> index 678b805f13d45..dfffec2f06ae7 100644
> --- a/drivers/clk/qcom/apss-ipq-pll.c
> +++ b/drivers/clk/qcom/apss-ipq-pll.c
> @@ -55,6 +55,29 @@ static struct clk_alpha_pll ipq_pll_huayra = {
>   	},
>   };
>   
> +static struct clk_alpha_pll ipq_pll_stromer = {
> +	.offset = 0x0,
> +	/*
> +	 * Reuse CLK_ALPHA_PLL_TYPE_STROMER_PLUS register offsets.
> +	 * Although this is a bit confusing, but the offset values
> +	 * are correct nevertheless.
> +	 */
> +	.regs = ipq_pll_offsets[CLK_ALPHA_PLL_TYPE_STROMER_PLUS],
> +	.flags = SUPPORTS_DYNAMIC_UPDATE,
> +	.clkr = {
> +		.enable_reg = 0x0,
> +		.enable_mask = BIT(0),
> +		.hw.init = &(const struct clk_init_data) {
> +			.name = "a53pll",
> +			.parent_data = &(const struct clk_parent_data) {
> +				.fw_name = "xo",
> +			},
> +			.num_parents = 1,
> +			.ops = &clk_alpha_pll_stromer_ops,
> +		},
> +	},
> +};
> +
>   static struct clk_alpha_pll ipq_pll_stromer_plus = {
>   	.offset = 0x0,
>   	.regs = ipq_pll_offsets[CLK_ALPHA_PLL_TYPE_STROMER_PLUS],
> @@ -144,8 +167,8 @@ struct apss_pll_data {
>   };
>   
>   static const struct apss_pll_data ipq5018_pll_data = {
> -	.pll_type = CLK_ALPHA_PLL_TYPE_STROMER_PLUS,
> -	.pll = &ipq_pll_stromer_plus,
> +	.pll_type = CLK_ALPHA_PLL_TYPE_STROMER,
> +	.pll = &ipq_pll_stromer,
>   	.pll_config = &ipq5018_pll_config,
>   };
>   
> @@ -203,7 +226,8 @@ static int apss_ipq_pll_probe(struct platform_device *pdev)
>   
>   	if (data->pll_type == CLK_ALPHA_PLL_TYPE_HUAYRA)
>   		clk_alpha_pll_configure(data->pll, regmap, data->pll_config);
> -	else if (data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER_PLUS)
> +	else if (data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER ||
> +		 data->pll_type == CLK_ALPHA_PLL_TYPE_STROMER_PLUS)
>   		clk_stromer_pll_configure(data->pll, regmap, data->pll_config);
>   
>   	ret = devm_clk_register_regmap(dev, &data->pll->clkr);
> 
> ---
> base-commit: e8f897f4afef0031fe618a8e94127a0934896aba
> change-id: 20240311-apss-ipq-pll-ipq5018-hang-74d9a8f47136
> 
> Best regards,