linux-kernel - Re: [PATCH] clk: qcom: gcc-ipq9574: Add BRANCH_HALT

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Date: Thu, 02 May 2024 15:08:10 -0700
From: Stephen Boyd <sboyd@...nel.org>
To: Md Sadre Alam <quic_mdalam@...cinc.com>, linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org, mturquette@...libre.com, quic_srichara@...cinc.com, quic_varada@...cinc.com
Cc: quic_mdalam@...cinc.com
Subject: Re: [PATCH] clk: qcom: gcc-ipq9574: Add BRANCH_HALT_VOTED flag

Quoting Md Sadre Alam (2024-05-01 20:42:47)
> Add BRANCH_HALT_VOTED flag to inform clock framework
> don't check for CLK_OFF bit.
> 
> CRYPTO_AHB_CLK_ENA and CRYPTO_AXI_CLK_ENA enable bit is
> present in other VOTE registers also, like TZ.
> If anyone else also enabled this clock, even if we turn
> off in GCC_APCS_CLOCK_BRANCH_ENA_VOTE | 0x180B004, it won't
> turn off.

Are you seeing problems where we need to send this patch to stable?

> 
> Signed-off-by: Md Sadre Alam <quic_mdalam@...cinc.com>
> ---

Any fixes tag?

>  drivers/clk/qcom/gcc-ipq9574.c | 10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/clk/qcom/gcc-ipq9574.c b/drivers/clk/qcom/gcc-ipq9574.c
> index 0a3f846695b8..f8b9a1e93bef 100644
> --- a/drivers/clk/qcom/gcc-ipq9574.c
> +++ b/drivers/clk/qcom/gcc-ipq9574.c
> @@ -2140,9 +2140,10 @@ static struct clk_rcg2 pcnoc_bfdcd_clk_src = {
>  
>  static struct clk_branch gcc_crypto_axi_clk = {
>         .halt_reg = 0x16010,
> +       .halt_check = BRANCH_HALT_VOTED,
>         .clkr = {
> -               .enable_reg = 0x16010,
> -               .enable_mask = BIT(0),
> +               .enable_reg = 0xb004,

You could be more explicit in the commit text that you're changing the
register offset to the voting register.

> +               .enable_mask = BIT(15),