linux-kernel - Re: [PATCH 5/5] mmc: core: Add support for graceful host removal for SD

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Message-ID: <Z-uou73DUQoceMj5@shikoro>
Date: Tue, 1 Apr 2025 10:50:03 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
	linux-renesas-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] mmc: core: Add support for graceful host removal for
 SD

On Mon, Mar 31, 2025 at 10:30:35AM +0200, Wolfram Sang wrote:
> On Thu, Mar 20, 2025 at 03:00:36PM +0100, Ulf Hansson wrote:
> > An mmc host driver may allow to unbind from its corresponding host device.
> > If an SD card is attached to the host, the mmc core will just try to cut
> > the power for it, without obeying to the SD spec that potentially may
> > damage the card.
> > 
> > Let's fix this problem by implementing a graceful power-down of the card at
> > host removal.
> > 
> > Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> 
> Reviewed-by: Wolfram Sang <wsa+renesas@...g-engineering.com>

I couldn't find a card yet which has SD_EXT_POWER_OFF_NOTIFY set, but at
least I can confirm that the actual code paths are taken:

Tested-by: Wolfram Sang <wsa+renesas@...g-engineering.com>


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