linux-kernel - Re: [PATCH 2/3] clk: qcom: gcc-ipq5018: fix 'halt_reg' offset of 'gcc_pcie1_pipe

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Message-ID: <8144cb83-077d-46ec-ae10-13d99fba34ae@quicinc.com>
Date: Mon, 26 Feb 2024 15:26:34 +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>,
        "Gokul Sriram
 Palanisamy" <quic_gokulsri@...cinc.com>,
        Varadarajan Narayanan
	<quic_varada@...cinc.com>,
        Sricharan Ramabadhran <quic_srichara@...cinc.com>
CC: <linux-arm-msm@...r.kernel.org>, <linux-clk@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/3] clk: qcom: gcc-ipq5018: fix 'halt_reg' offset of
 'gcc_pcie1_pipe_clk'



On 2/25/2024 11:02 PM, Gabor Juhos wrote:
> The following table shows the values of the 'halt_reg' and the
> 'enable_reg' fields from the pcie clocks defined in the current
> driver:
> 
>    clock                        halt_reg    enable_reg
> 
>    gcc_pcie0_ahb_clk            0x75010     0x75010
>    gcc_pcie0_aux_clk            0x75014     0x75014
>    gcc_pcie0_axi_m_clk          0x75008     0x75008
>    gcc_pcie0_axi_s_bridge_clk   0x75048     0x75048
>    gcc_pcie0_axi_s_clk          0x7500c     0x7500c
>    gcc_pcie0_pipe_clk           0x75018     0x75018
> 
>    gcc_pcie1_ahb_clk            0x76010     0x76010
>    gcc_pcie1_aux_clk            0x76014     0x76014
>    gcc_pcie1_axi_m_clk          0x76008     0x76008
>    gcc_pcie1_axi_s_bridge_clk   0x76048     0x76048
>    gcc_pcie1_axi_s_clk          0x7600c     0x7600c
>    gcc_pcie1_pipe_clk                 8*    0x76018
> 
> Based on the table, it is quite likely that the pcie0 and the pci1
> clocks are using the same register layout, however it seems that
> the value of the 'halt_reg' field in the 'gcc_pcie1_pipe_clk' clock
> is wrong.
> 
> In the downstream driver [1], the same '0x76018' value is used for
> both the 'halt_reg' and for the 'enable_reg' fields of the
> 'gcc_pcie1_pipe_clk' clock.
> 
> Update the current driver to use the same value used downstream as
> probably that is the correct value.
> 
> 1. https://git.codelinaro.org/clo/qsdk/oss/kernel/linux-ipq-5.4/-/blob/NHSS.QSDK.12.4.r4/drivers/clk/qcom/gcc-ipq5018.c?ref_type=heads#L2316


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


> 
> Fixes: e3fdbef1bab8 ("clk: qcom: Add Global Clock controller (GCC) driver for IPQ5018")
> Signed-off-by: Gabor Juhos <j4g8y7@...il.com>
> ---
>   drivers/clk/qcom/gcc-ipq5018.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/clk/qcom/gcc-ipq5018.c b/drivers/clk/qcom/gcc-ipq5018.c
> index cef9a1e7c9fdb..5e81cfa77293a 100644
> --- a/drivers/clk/qcom/gcc-ipq5018.c
> +++ b/drivers/clk/qcom/gcc-ipq5018.c
> @@ -2180,7 +2180,7 @@ static struct clk_branch gcc_pcie1_axi_s_clk = {
>   };
>   
>   static struct clk_branch gcc_pcie1_pipe_clk = {
> -	.halt_reg = 8,
> +	.halt_reg = 0x76018,
>   	.halt_check = BRANCH_HALT_DELAY,
>   	.halt_bit = 31,
>   	.clkr = {
>