linux-kernel - Re: [PATCH] clk: qcom: gcc-ipq6018: add qdss

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Date: Thu, 18 Jan 2024 18:48:34 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Mantas Pucka <mantas@...vices.com>, Bjorn Andersson
 <andersson@...nel.org>, Michael Turquette <mturquette@...libre.com>,
 Stephen Boyd <sboyd@...nel.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: qcom: gcc-ipq6018: add qdss_at clock needed for wifi
 operation



On 1/17/24 11:17, Mantas Pucka wrote:
> Without it system hangs upon wifi firmware load. Bindings already exist
> for it, so add it based on vendor code.
> 
> Signed-off-by: Mantas Pucka <mantas@...vices.com>
> ---
>   drivers/clk/qcom/gcc-ipq6018.c | 17 +++++++++++++++++
>   1 file changed, 17 insertions(+)
> 
> diff --git a/drivers/clk/qcom/gcc-ipq6018.c b/drivers/clk/qcom/gcc-ipq6018.c
> index b366912cd648..7cdaf7751566 100644
> --- a/drivers/clk/qcom/gcc-ipq6018.c
> +++ b/drivers/clk/qcom/gcc-ipq6018.c
> @@ -3522,6 +3522,22 @@ static struct clk_branch gcc_prng_ahb_clk = {
>   	},
>   };
>   
> +static struct clk_branch gcc_qdss_at_clk = {

Hm, QDSS stands for something something Qualcomm Debug SubSystem
if I recall correctly, so coresight and friends.. Are you sure
it's necessary?

> +	.halt_reg = 0x29024,
> +	.clkr = {
> +		.enable_reg = 0x29024,
> +		.enable_mask = BIT(0),
> +		.hw.init = &(struct clk_init_data){
> +			.name = "gcc_qdss_at_clk",
> +			.parent_hws = (const struct clk_hw *[]){
> +				&qdss_at_clk_src.clkr.hw },
> +			.num_parents = 1,
> +			.flags = CLK_SET_RATE_PARENT | CLK_IS_CRITICAL,

Does it need to be enabled 24/7, or can it be attached to the wifi device?

Konrad