linux-kernel - Re: [PATCH 4/5] mmc: core: Add support for graceful host removal for eMMC

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Message-ID: <Z-pRHlwL1ntGgUuv@shikoro>
Date: Mon, 31 Mar 2025 10:23:58 +0200
From: Wolfram Sang <wsa+renesas@...g-engineering.com>
To: Ulf Hansson <ulf.hansson@...aro.org>
Cc: 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 4/5] mmc: core: Add support for graceful host removal for
 eMMC

On Thu, Mar 20, 2025 at 03:00:35PM +0100, Ulf Hansson wrote:
> An mmc host driver may allow to unbind from its corresponding host device.
> If an eMMC card is attached to the host, the mmc core will just try to cut
> the power for it, without obeying to the eMMC spec.
> 
> Potentially this may damage the card and it may also prevent us from
> successfully doing a re-initialization of it, which would typically happen
> if/when we try to re-bind the mmc host driver.
> 
> To fix these problems, let's implement a graceful power-down of the card at
> host removal.
> 
> Reported-by: Wolfram Sang <wsa+renesas@...g-engineering.com>
> Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>

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


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