linux-kernel - Re: [PATCH v2] mmc: renesas_sdhi: Set the SDBUF after reset

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Date: Fri, 26 Apr 2024 08:19:40 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: Claudiu Beznea <claudiu.beznea@...on.dev>, linux-mmc@...r.kernel.org,
	linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org,
	Claudiu Beznea <claudiu.beznea.uj@...renesas.com>,
	Hien Huynh <hien.huynh.px@...esas.com>
Subject: Re: [PATCH v2] mmc: renesas_sdhi: Set the SDBUF after reset

On Fri, Apr 26, 2024 at 07:08:10AM +0200, Ulf Hansson wrote:
> On Wed, 10 Apr 2024 at 15:54, Claudiu Beznea <claudiu.beznea@...on.dev> wrote:
> >
> > For development purpose, renesas_sdhi_probe() could be called w/
> > dma_ops = NULL to force the usage of PIO mode. In this case the
> > renesas_sdhi_enable_dma() will not be called before transferring data.
> >
> > If renesas_sdhi_enable_dma() is not called, renesas_sdhi_clk_enable()
> > call from renesas_sdhi_probe() will configure SDBUF by calling the
> > renesas_sdhi_sdbuf_width() function, but then SDBUF will be reset in
> > tmio_mmc_host_probe() when calling tmio_mmc_reset() though host->reset().
> > If SDBUF is zero the data transfer will not work in PIO mode for RZ/G3S.
> >
> > To fix this call again the renesas_sdhi_sdbuf_width(host, 16) in
> > renesas_sdhi_reset(). The call of renesas_sdhi_sdbuf_width() was not
> > removed from renesas_sdhi_clk_enable() as the host->reset() is optional.
> >
> > Co-developed-by: Hien Huynh <hien.huynh.px@...esas.com>
> > Signed-off-by: Hien Huynh <hien.huynh.px@...esas.com>
> > Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@...renesas.com>
> 
> Wolfram, when you have the time, can we get your opinion on this one?

Sure, I'll try to squeeze it in today. Thanks for the heads up!


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