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

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Date: Wed, 20 Dec 2023 13:53:25 +0530
From: Dikshita Agarwal <quic_dikshita@...cinc.com>
To: Konrad Dybcio <konrad.dybcio@...aro.org>, <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 12/19/2023 5:54 PM, Konrad Dybcio wrote:
> 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__
Sure
> 
> [...]
> 
>> +	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
> 
Will check and do the needful.
>> +
>> +	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
> 
Will check this.
> Konrad