linux-kernel - Re: [PATCH v2 29/34] media: iris: implement power management

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Date: Tue, 19 Dec 2023 13:24:47 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Dikshita Agarwal <quic_dikshita@...cinc.com>,
 linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 stanimir.k.varbanov@...il.com, quic_vgarodia@...cinc.com, agross@...nel.org,
 andersson@...nel.org, mchehab@...nel.org, bryan.odonoghue@...aro.org
Cc: linux-arm-msm@...r.kernel.org, quic_abhinavk@...cinc.com
Subject: Re: [PATCH v2 29/34] media: iris: implement power management

On 18.12.2023 12:32, Dikshita Agarwal wrote:
> From: Vikash Garodia <quic_vgarodia@...cinc.com>
> 
> Hardware specific power sequence include programming specific
> sequence of registers. Implements this sequence for iris3.
> 
> Introduce video device suspend and resume using runtime PM.
> 
> Also, implement iris3 specific calculation for clock and
> bus bandwidth which depends on hardware configuration,
> codec format, resolution and frame rate.
> 
> Signed-off-by: Vikash Garodia <quic_vgarodia@...cinc.com>
> Signed-off-by: Dikshita Agarwal <quic_dikshita@...cinc.com>
> ---
[...]

> @@ -97,6 +103,7 @@ static int iris_probe(struct platform_device *pdev)
return dev_err_probe, drop __func__

[...]

> +	ret = readl_relaxed_poll_timeout(base_addr + reg, val, ((val & mask) == exp_val),
> +					 sleep_us, timeout_us);
> +	/*
> +	 * Memory barrier to make sure value is read correctly from the
> +	 * register.
> +	 */
> +	rmb();
just drop _relaxed and return directly

> +
> +	return ret;
> +}
[...]

> +	ret = read_register_with_poll_timeout(core, AON_WRAPPER_MVP_NOC_RESET_ACK,
> +					      0x3, 0x3, 200, 2000);
that looks like a lot of bits/bitfields that deserve #defining in this
and some other functions

Konrad