linux-kernel - Re: [PATCH v2 2/7] media: platform: qcom/iris: split iris_vpu_power_off

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Message-ID: <4cacd96b-8d71-4b0a-954b-8d6f4a769f82@linaro.org>
Date: Thu, 6 Mar 2025 12:34:49 +0000
From: Bryan O'Donoghue <bryan.odonoghue@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Abhinav Kumar <quic_abhinavk@...cinc.com>,
 Mauro Carvalho Chehab <mchehab@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Philipp Zabel <p.zabel@...gutronix.de>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/7] media: platform: qcom/iris: split
 iris_vpu_power_off_controller in multiple steps

On 05/03/2025 19:05, Neil Armstrong wrote:
> In order to support vpu33, the iris_vpu_power_off_controller needs to be
> reused and extended, but the AON_WRAPPER_MVP_NOC_LPI_CONTROL cannot be
> set from the power_off_controller sequence like vpu2 and vpu3 so
> split the power_off_controller into 3 steps:
> - iris_vpu_power_off_controller_begin
> - iris_vpu_power_off_controller_end
> - iris_vpu_power_off_controller_disable
> 
> And use them in a common iris_vpu_power_off_controller() for
> vpu2 and vpu3 based platforms.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@...aro.org>
> ---
>   drivers/media/platform/qcom/iris/iris_vpu_common.c | 46 ++++++++++++++++------
>   1 file changed, 33 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_vpu_common.c b/drivers/media/platform/qcom/iris/iris_vpu_common.c
> index fe9896d66848cdcd8c67bd45bbf3b6ce4a01ab10..d6ce92f3c7544e44dccca26bf6a4c95a720f9229 100644
> --- a/drivers/media/platform/qcom/iris/iris_vpu_common.c
> +++ b/drivers/media/platform/qcom/iris/iris_vpu_common.c
> @@ -211,33 +211,29 @@ int iris_vpu_prepare_pc(struct iris_core *core)
>   	return -EAGAIN;
>   }
> 
> -static int iris_vpu_power_off_controller(struct iris_core *core)
> +static void iris_vpu_power_off_controller_begin(struct iris_core *core)
>   {
> -	u32 val = 0;
> -	int ret;
> -
>   	writel(MSK_SIGNAL_FROM_TENSILICA | MSK_CORE_POWER_ON, core->reg_base + CPU_CS_X2RPMH);
> +}
> 
> -	writel(REQ_POWER_DOWN_PREP, core->reg_base + AON_WRAPPER_MVP_NOC_LPI_CONTROL);
> -
> -	ret = readl_poll_timeout(core->reg_base + AON_WRAPPER_MVP_NOC_LPI_STATUS,
> -				 val, val & BIT(0), 200, 2000);
> -	if (ret)
> -		goto disable_power;
> +static int iris_vpu_power_off_controller_end(struct iris_core *core)
> +{
> +	u32 val = 0;
> +	int ret;
> 
>   	writel(REQ_POWER_DOWN_PREP, core->reg_base + WRAPPER_IRIS_CPU_NOC_LPI_CONTROL);
> 
>   	ret = readl_poll_timeout(core->reg_base + WRAPPER_IRIS_CPU_NOC_LPI_STATUS,
>   				 val, val & BIT(0), 200, 2000);
>   	if (ret)
> -		goto disable_power;
> +		return ret;
> 
>   	writel(0x0, core->reg_base + WRAPPER_DEBUG_BRIDGE_LPI_CONTROL);
> 
>   	ret = readl_poll_timeout(core->reg_base + WRAPPER_DEBUG_BRIDGE_LPI_STATUS,
>   				 val, val == 0, 200, 2000);
>   	if (ret)
> -		goto disable_power;
> +		return ret;
> 
>   	writel(CTL_AXI_CLK_HALT | CTL_CLK_HALT,
>   	       core->reg_base + WRAPPER_TZ_CTL_AXI_CLOCK_CONFIG);
> @@ -245,10 +241,34 @@ static int iris_vpu_power_off_controller(struct iris_core *core)
>   	writel(0x0, core->reg_base + WRAPPER_TZ_QNS4PDXFIFO_RESET);
>   	writel(0x0, core->reg_base + WRAPPER_TZ_CTL_AXI_CLOCK_CONFIG);
> 
> -disable_power:
> +	return 0;
> +}
> +
> +static void iris_vpu_power_off_controller_disable(struct iris_core *core)
> +{
>   	iris_disable_unprepare_clock(core, IRIS_CTRL_CLK);
>   	iris_disable_unprepare_clock(core, IRIS_AXI_CLK);
>   	iris_disable_power_domains(core, core->pmdomain_tbl->pd_devs[IRIS_CTRL_POWER_DOMAIN]);
> +}
> +
> +static int iris_vpu_power_off_controller(struct iris_core *core)
> +{
> +	u32 val = 0;
> +	int ret;
> +
> +	iris_vpu_power_off_controller_begin(core);
> +
> +	writel(REQ_POWER_DOWN_PREP, core->reg_base + AON_WRAPPER_MVP_NOC_LPI_CONTROL);
> +
> +	ret = readl_poll_timeout(core->reg_base + AON_WRAPPER_MVP_NOC_LPI_STATUS,
> +				 val, val & BIT(0), 200, 2000);
> +	if (ret)
> +		goto disable_power;
> +
> +	iris_vpu_power_off_controller_end(core);
> +
> +disable_power:
> +	iris_vpu_power_off_controller_disable(core);
> 
>   	return 0;
>   }
> 
> --
> 2.34.1
> 
> 

Have you checked that rb5/sm8250 still works after this change ?

---
bod