From: Ulf Hansson <ulf.hansson@linaro.org>
To: Claudiu <claudiu.beznea@tuxon.dev>
Cc: wsa+renesas@sang-engineering.com, linux-mmc@vger.kernel.org,
linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org,
Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>,
Hien Huynh <hien.huynh.px@renesas.com>
Subject: Re: [PATCH v3] mmc: renesas_sdhi: Set the SDBUF after reset
Date: Fri, 3 May 2024 15:14:50 +0200 [thread overview]
Message-ID: <CAPDyKFrPZ5XF93MD+g03UQP1d4WSPoop=VyAhzwLu9KV436KkA@mail.gmail.com> (raw)
In-Reply-To: <20240430093724.2692232-1-claudiu.beznea.uj@bp.renesas.com>
On Tue, 30 Apr 2024 at 11:37, Claudiu <claudiu.beznea@tuxon.dev> wrote:
>
> From: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
>
> 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@renesas.com>
> Signed-off-by: Hien Huynh <hien.huynh.px@renesas.com>
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Applied for next, thanks!
Kind regards
Uffe
> ---
>
> Changes in v3:
> - shortened the comment introduced in renesas_sdhi_reset()
>
> Changes in v2:
> - fixed typos in commit description
> - limit the comment lines to 80 chars
>
> drivers/mmc/host/renesas_sdhi_core.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/mmc/host/renesas_sdhi_core.c b/drivers/mmc/host/renesas_sdhi_core.c
> index f84f60139bcf..d9503f9f6e96 100644
> --- a/drivers/mmc/host/renesas_sdhi_core.c
> +++ b/drivers/mmc/host/renesas_sdhi_core.c
> @@ -589,6 +589,9 @@ static void renesas_sdhi_reset(struct tmio_mmc_host *host, bool preserve)
> sd_ctrl_write16(host, CTL_RESET_SD, 0x0001);
> priv->needs_adjust_hs400 = false;
> renesas_sdhi_set_clock(host, host->clk_cache);
> +
> + /* Ensure default value for this driver. */
> + renesas_sdhi_sdbuf_width(host, 16);
> } else if (priv->scc_ctl) {
> renesas_sdhi_scc_reset(host, priv);
> }
> --
> 2.39.2
>
prev parent reply other threads:[~2024-05-03 13:15 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-30 9:37 [PATCH v3] mmc: renesas_sdhi: Set the SDBUF after reset Claudiu
2024-04-30 9:53 ` Wolfram Sang
2024-05-03 13:14 ` Ulf Hansson [this message]
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