From: Fabio Estevam <festevam@gmail.com>
To: Jiada Wang <jiada_wang@mentor.com>
Cc: Mark Brown <broonie@kernel.org>,
"linux-spi@vger.kernel.org" <linux-spi@vger.kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>,
Sascha Hauer <s.hauer@pengutronix.de>
Subject: Re: [PATCH linux-next v3 1/1] spi: imx: dynamic burst length adjust for PIO mode
Date: Mon, 29 May 2017 08:07:42 -0300 [thread overview]
Message-ID: <CAOMZO5D4O38M3ZQYxcT2w+oW=HBuk2WPMN7Ue4Va_gz3zbKZ=Q@mail.gmail.com> (raw)
In-Reply-To: <1495774962-2981-1-git-send-email-jiada_wang@mentor.com>
Hi Jiada,
On Fri, May 26, 2017 at 2:02 AM, <jiada_wang@mentor.com> wrote:
> From: Jiada Wang <jiada_wang@mentor.com>
>
> previously burst length (BURST_LENGTH) is always set to equal
> to bits_per_word, causes a 10us gap between each word in
> transfer, which significantly affects performance.
>
> This patch uses 32 bits transfer to simulate lower bits transfer,
> and adjusts burst length runtimely to use biggeest burst length
> as possible to reduce the gaps in transfer for PIO mode.
Just curious: what is the performance gain you observe with this patch?
WARNING: multiple messages have this Message-ID (diff)
From: Fabio Estevam <festevam-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: Jiada Wang <jiada_wang-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org>
Cc: Mark Brown <broonie-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
"linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org"
<linux-spi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
linux-kernel
<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
Sascha Hauer <s.hauer-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
Subject: Re: [PATCH linux-next v3 1/1] spi: imx: dynamic burst length adjust for PIO mode
Date: Mon, 29 May 2017 08:07:42 -0300 [thread overview]
Message-ID: <CAOMZO5D4O38M3ZQYxcT2w+oW=HBuk2WPMN7Ue4Va_gz3zbKZ=Q@mail.gmail.com> (raw)
In-Reply-To: <1495774962-2981-1-git-send-email-jiada_wang-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org>
Hi Jiada,
On Fri, May 26, 2017 at 2:02 AM, <jiada_wang-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org> wrote:
> From: Jiada Wang <jiada_wang-nmGgyN9QBj3QT0dZR+AlfA@public.gmane.org>
>
> previously burst length (BURST_LENGTH) is always set to equal
> to bits_per_word, causes a 10us gap between each word in
> transfer, which significantly affects performance.
>
> This patch uses 32 bits transfer to simulate lower bits transfer,
> and adjusts burst length runtimely to use biggeest burst length
> as possible to reduce the gaps in transfer for PIO mode.
Just curious: what is the performance gain you observe with this patch?
--
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next prev parent reply other threads:[~2017-05-29 11:07 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-26 5:02 [PATCH linux-next v3 1/1] spi: imx: dynamic burst length adjust for PIO mode jiada_wang
2017-05-26 5:02 ` jiada_wang-nmGgyN9QBj3QT0dZR+AlfA
2017-05-29 9:50 ` Sascha Hauer
2017-05-29 9:50 ` Sascha Hauer
2017-06-01 11:58 ` Jiada Wang
2017-06-01 11:58 ` Jiada Wang
2017-06-02 5:38 ` Sascha Hauer
2017-06-02 5:38 ` Sascha Hauer
2017-06-09 5:09 ` Jiada Wang
2017-06-09 5:09 ` Jiada Wang
2017-06-09 5:46 ` Sascha Hauer
2017-06-09 5:46 ` Sascha Hauer
2017-05-29 11:07 ` Fabio Estevam [this message]
2017-05-29 11:07 ` Fabio Estevam
2017-06-01 7:55 ` Jiada Wang
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