linux-kernel - Re: [PATCH] mmc: meson-gx: Remove setting of CMD_CFG

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Date:   Wed, 27 Sep 2023 09:43:57 +0200
From:   Jerome Brunet <jbrunet@...libre.com>
To:     "Rong.Chen" <Rong.Chen@...ogic.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Neil Armstrong <narmstrong@...libre.com>,
        Kevin Hilman <khilman@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linux-mmc@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mmc: meson-gx: Remove setting of CMD_CFG_ERROR

s
On Wed 27 Sep 2023 at 15:25, "Rong.Chen" <Rong.Chen@...ogic.com> wrote:

> From: Rong Chen <rong.chen@...ogic.com>
>
> Setting bit CMD_CFG_ERROR has non effects on previous controllers.

Which previous controllers ? v2, v3 ? Can you list the SoCs please ?

> However, it will cause an IRQ and stop working on latest controllers,

Isn't it desirable to stop on error ? seems like a sane thing to do.

> This bit is used for selecting SG LINK of data address.
> Don't set the bit CMD_CFG_ERROR anymore to resolve this issuse.

I'm not sure I understand the actual issue being resolved.
Could you provide more details please ?

>
> Therefore, remove this setting.
>
> Signed-off-by: Rong Chen <rong.chen@...ogic.com>
> ---
>  drivers/mmc/host/meson-gx-mmc.c | 1 -
>  1 file changed, 1 deletion(-)
>
> diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
> index 9837dab096e6..c7c067b9415a 100644
> --- a/drivers/mmc/host/meson-gx-mmc.c
> +++ b/drivers/mmc/host/meson-gx-mmc.c
> @@ -801,7 +801,6 @@ static void meson_mmc_start_cmd(struct mmc_host *mmc, struct mmc_command *cmd)
>  
>  	cmd_cfg |= FIELD_PREP(CMD_CFG_CMD_INDEX_MASK, cmd->opcode);
>  	cmd_cfg |= CMD_CFG_OWNER;  /* owned by CPU */
> -	cmd_cfg |= CMD_CFG_ERROR; /* stop in case of error */
>  
>  	meson_mmc_set_response_bits(cmd, &cmd_cfg);