linux-kernel - Re: [PATCH 07/12] memory: stm32-fmc2-ebi: add runtime PM support

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Date: Tue, 13 Feb 2024 14:31:22 +0100
From: Christophe Kerello <christophe.kerello@...s.st.com>
To: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        <miquel.raynal@...tlin.com>, <richard@....at>, <vigneshr@...com>,
        <robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <conor+dt@...nel.org>
CC: <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <devicetree@...r.kernel.org>
Subject: Re: [PATCH 07/12] memory: stm32-fmc2-ebi: add runtime PM support



On 2/13/24 08:59, Krzysztof Kozlowski wrote:
> On 12/02/2024 18:48, Christophe Kerello wrote:
>> Add runtime PM support in FMC2 ebi driver to be able to manage GENPD
>> support when it will be enabled.
> 

Hi Krzysztof,

> You don't do any real runtime PM here (turning on PM domain on probe is
> not real PM), so please explain what is the goal of it and say that it
> is basic RPM for keeping domain on.
> 

Yes, you are true, I will modify the commit message.

>>
>> Signed-off-by: Christophe Kerello <christophe.kerello@...s.st.com>
>> ---
>>   drivers/memory/stm32-fmc2-ebi.c | 40 ++++++++++++++++++++++++++-------
>>   1 file changed, 32 insertions(+), 8 deletions(-)
>>
>> diff --git a/drivers/memory/stm32-fmc2-ebi.c b/drivers/memory/stm32-fmc2-ebi.c
>> index 04248c15832f..8c30e56be3b0 100644
>> --- a/drivers/memory/stm32-fmc2-ebi.c
>> +++ b/drivers/memory/stm32-fmc2-ebi.c
>> @@ -11,6 +11,7 @@
>>   #include <linux/of_platform.h>
>>   #include <linux/pinctrl/consumer.h>
>>   #include <linux/platform_device.h>
>> +#include <linux/pm_runtime.h>
>>   #include <linux/regmap.h>
>>   #include <linux/reset.h>
>>   
>> @@ -1381,6 +1382,7 @@ static int stm32_fmc2_ebi_probe(struct platform_device *pdev)
>>   		return -ENOMEM;
>>   
>>   	ebi->dev = dev;
>> +	platform_set_drvdata(pdev, ebi);
> 
> Does not look related.
> 

With pm_runtime_resume_and_get API now called, 
stm32_fmc2_ebi_runtime_resume needs ebi data to enable the clock. It
means that the platform data has to be set before this call.

Regards,
Christophe Kerello.

> 
> Best regards,
> Krzysztof
>