From: Maxime Ripard <maxime@cerno.tech>
To: Alexander Kochetkov <al.kochet@gmail.com>
Cc: Mark Brown <broonie@kernel.org>, Chen-Yu Tsai <wens@csie.org>,
linux-spi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2] spi: spi-sun6i: enable autosuspend feature
Date: Wed, 21 Oct 2020 17:02:58 +0200 [thread overview]
Message-ID: <20201021150258.mwis3ez5b6emqoci@gilmour.lan> (raw)
In-Reply-To: <20201019150343.2520-1-akochetkov@lintech.ru>
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On Mon, Oct 19, 2020 at 06:03:43PM +0300, Alexander Kochetkov wrote:
> From: Alexander Kochetkov <al.kochet@gmail.com>
>
> If SPI is used for periodic polling any sensor, significant delays
> sometimes appear. Switching on module clocks during resume lead to delays.
> Enabling autosuspend mode causes the controller to not suspend between
> SPI transfers and the delays disappear.
>
> The commit also remove unnecessary call to pm_runtime_idle() used
> to explicit put device to suspended state. Without pm_runtime_idle() PM
> core will put device in the suspended state just after probe() returns.
>
> Signed-off-by: Alexander Kochetkov <al.kochet@gmail.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Thanks!
Maxime
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next prev parent reply other threads:[~2020-10-21 15:03 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-19 15:03 [PATCH v2] spi: spi-sun6i: enable autosuspend feature Alexander Kochetkov
2020-10-21 15:02 ` Maxime Ripard [this message]
2020-10-26 23:47 ` Mark Brown
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