Re: [PATCH 10/13] clk: qcom: cpu-8996: fix ACD initialization

[Konrad Dybcio <konrad.dybcio@linaro.org>]

On 11.01.2023 20:20, Dmitry Baryshkov wrote:
> The vendor kernel applies different order while programming SSSCTL and
> L2ACDCR registers on power and performance clusters. However it was
> demonstrated that doing this upstream results in the board reset. Make
> both clusters use the same sequence, which fixes the reset.
> 
> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> ---
I think we should look for the source of why this doesn't work,
e.g. does downstream program it earlier somewhere? Are we
missing something else that may bite later?

Konrad
>  drivers/clk/qcom/clk-cpu-8996.c | 20 ++++++++------------
>  1 file changed, 8 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/clk/qcom/clk-cpu-8996.c b/drivers/clk/qcom/clk-cpu-8996.c
> index 47c58bb5f21a..1c00eb629b61 100644
> --- a/drivers/clk/qcom/clk-cpu-8996.c
> +++ b/drivers/clk/qcom/clk-cpu-8996.c
> @@ -475,9 +475,9 @@ static int qcom_cpu_clk_msm8996_register_clks(struct device *dev,
>  	return ret;
>  }
>  
> -#define CPU_AFINITY_MASK 0xFFF
> -#define PWRCL_CPU_REG_MASK 0x3
> -#define PERFCL_CPU_REG_MASK 0x103
> +#define CPU_CLUSTER_AFFINITY_MASK 0xf00
> +#define PWRCL_AFFINITY_MASK 0x000
> +#define PERFCL_AFFINITY_MASK 0x100
>  
>  #define L2ACDCR_REG 0x580ULL
>  #define L2ACDTD_REG 0x581ULL
> @@ -498,21 +498,17 @@ static void qcom_cpu_clk_msm8996_acd_init(struct regmap *regmap)
>  	if (val == 0x00006a11)
>  		goto out;
>  
> -	hwid = read_cpuid_mpidr() & CPU_AFINITY_MASK;
> -
>  	kryo_l2_set_indirect_reg(L2ACDTD_REG, 0x00006a11);
>  	kryo_l2_set_indirect_reg(L2ACDDVMRC_REG, 0x000e0f0f);
>  	kryo_l2_set_indirect_reg(L2ACDSSCR_REG, 0x00000601);
>  
> -	if (PWRCL_CPU_REG_MASK == (hwid | PWRCL_CPU_REG_MASK)) {
> -		regmap_write(regmap, PWRCL_REG_OFFSET + SSSCTL_OFFSET, 0xf);
> -		kryo_l2_set_indirect_reg(L2ACDCR_REG, 0x002c5ffd);
> -	}
> +	kryo_l2_set_indirect_reg(L2ACDCR_REG, 0x002c5ffd);
>  
> -	if (PERFCL_CPU_REG_MASK == (hwid | PERFCL_CPU_REG_MASK)) {
> -		kryo_l2_set_indirect_reg(L2ACDCR_REG, 0x002c5ffd);
> +	hwid = read_cpuid_mpidr();
> +	if ((hwid & CPU_CLUSTER_AFFINITY_MASK) == PWRCL_AFFINITY_MASK)
> +		regmap_write(regmap, PWRCL_REG_OFFSET + SSSCTL_OFFSET, 0xf);
> +	else
>  		regmap_write(regmap, PERFCL_REG_OFFSET + SSSCTL_OFFSET, 0xf);
> -	}
>  
>  out:
>  	spin_unlock_irqrestore(&qcom_clk_acd_lock, flags);