linux-kernel - Re: [PATCH] mmc: add MMC_QUIRK_BROKEN_CLK

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Date:	Wed, 5 Jan 2011 00:52:28 +0100
From:	Linus Walleij <linus.walleij@...ricsson.com>
To:	Pierre Tardy <tardyp@...il.com>
Cc:	"Gao, Yunpeng" <yunpeng.gao@...el.com>,
	"Yuan, Hang" <hang.yuan@...el.com>,
	"linux-mmc@...r.kernel.org" <linux-mmc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Chris Ball <cjb@...top.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alan Cox <alan@...ux.intel.com>, Takashi Iwai <tiwai@...e.de>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Ohad Ben-Cohen <ohad@...ery.com>
Subject: Re: [PATCH] mmc: add MMC_QUIRK_BROKEN_CLK_GATING

2011/1/2 Pierre Tardy <tardyp@...il.com>:

> Some sdio card are not following sdio standard, and does not work
> when the sdio bus's clock is gated

Seem to me like it's pretty straight-forward and will work...
Acked-by: Linus Walleij <linus.walleij@...ricsson.com>

> diff --git a/drivers/mmc/core/sdio.c b/drivers/mmc/core/sdio.c
> index 82f4b90..6df1ead 100644
> --- a/drivers/mmc/core/sdio.c
> +++ b/drivers/mmc/core/sdio.c
> @@ -785,6 +785,12 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr)
>
>        mmc_release_host(host);
>
> +        /*
> +         * see comments in mmc_host_may_gate_card()
> +         * this can be overidden by function drivers if they know that
> +         * their sdio card works with clock gating
> +         */
> +        card->quirks |= MMC_QUIRK_BROKEN_CLK_GATING;

...so the function driver will do something like this:

/* May gate clock */
card->quirks &= ~MMC_QUIRK_BROKEN_CLK_GATING;

Do you have a candidate function driver to do this ...?

Yours,
Linus Walleij
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