linux-kernel - Re: [PATCH v4] media: iris: vpu3x: Add MNoC low power handshake during hardware power-off

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Message-ID: <fff4d178-cc0c-471b-90f4-ddc16e41a284@kernel.org>
Date: Mon, 1 Sep 2025 16:14:22 +0200
From: Krzysztof Kozlowski <krzk@...nel.org>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
 Vikash Garodia <quic_vgarodia@...cinc.com>,
 Abhinav Kumar <abhinav.kumar@...ux.dev>,
 Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Mauro Carvalho Chehab <mchehab@...nel.org>
Cc: linux-media@...r.kernel.org, linux-arm-msm@...r.kernel.org,
 linux-kernel@...r.kernel.org, Neil Armstrong <neil.armstrong@...aro.org>
Subject: Re: [PATCH v4] media: iris: vpu3x: Add MNoC low power handshake
 during hardware power-off

On 22/08/2025 07:53, Dikshita Agarwal wrote:
> diff --git a/drivers/media/platform/qcom/iris/iris_vpu3x.c b/drivers/media/platform/qcom/iris/iris_vpu3x.c
> index 9b7c9a1495ee2f51c60b1142b2ed4680ff798f0a..bfc52eb04ed0e1c88efe74a8d27bb95e8a0ca331 100644
> --- a/drivers/media/platform/qcom/iris/iris_vpu3x.c
> +++ b/drivers/media/platform/qcom/iris/iris_vpu3x.c
> @@ -19,6 +19,9 @@
>  #define WRAPPER_IRIS_CPU_NOC_LPI_CONTROL	(WRAPPER_BASE_OFFS + 0x5C)
>  #define REQ_POWER_DOWN_PREP			BIT(0)
>  #define WRAPPER_IRIS_CPU_NOC_LPI_STATUS		(WRAPPER_BASE_OFFS + 0x60)
> +#define NOC_LPI_STATUS_DONE			BIT(0) /* Indicates the NOC handshake is complete */
> +#define NOC_LPI_STATUS_DENY			BIT(1) /* Indicates the NOC handshake is denied */
> +#define NOC_LPI_STATUS_ACTIVE		BIT(2) /* Indicates the NOC is active */
>  #define WRAPPER_CORE_CLOCK_CONFIG		(WRAPPER_BASE_OFFS + 0x88)
>  #define CORE_CLK_RUN				0x0
>  
> @@ -109,7 +112,9 @@ static void iris_vpu3_power_off_hardware(struct iris_core *core)
>  
>  static void iris_vpu33_power_off_hardware(struct iris_core *core)
>  {
> +	bool handshake_done = false, handshake_busy = false;
>  	u32 reg_val = 0, value, i;
> +	u32 count = 0;

unsigned int, that's not a register but standard kernel counting type.

>  	int ret;
>  
>  	if (iris_vpu3x_hw_power_collapsed(core))
> @@ -128,13 +133,36 @@ static void iris_vpu33_power_off_hardware(struct iris_core *core)
>  			goto disable_power;
>  	}


Best regards,
Krzysztof