linux-kernel - Re: [PATCH v2 0/4] Improves polling mode of s3c64xx driver

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Message-ID: <a8541b6c-953f-adf5-2f39-f35a8162657f@samsung.com>
Date:   Wed, 19 Apr 2023 17:29:18 +0900
From:   Jaewon Kim <jaewon02.kim@...sung.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Mark Brown <broonie@...nel.org>, Andi Shyti <andi@...zian.org>,
        Alim Akhtar <alim.akhtar@...sung.com>
Cc:     linux-spi@...r.kernel.org, linux-samsung-soc@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Chanho Park <chanho61.park@...sung.com>
Subject: Re: [PATCH v2 0/4] Improves polling mode of s3c64xx driver


On 23. 4. 19. 16:59, Krzysztof Kozlowski wrote:
> On 19/04/2023 08:06, Jaewon Kim wrote:
>> 1.
>> s3cx64xx driver was supporting polling mode using quirk for SOC without DMA.
>> However, in order to use PIO mode as an optional rather than a quirk, when DMA
>> is not described, spi operates with pio mode rather than probe fail.
>>
>> 2.
>> Fixed the problem of high CPU usage in PIO mode.
>>
>> 3.
>> If the transfer data size is larger than 32-bit, IRQ base PIO mode used.
>>
> What changed in the patches? You need to provide changelog.


Oh, I missed changes while copy/pasting.

I will add changes v2 from v3 together.

Changes in V2.
- DeviceTree property not used to change PIO mod.
- Add cpu_releax() in polling loop
- Add lower limit in IRQ mode


>
> Best regards,
> Krzysztof
>
>
Thanks

Jaewon Kim