linux-kernel - Re: [PATCH] phy: marvell: phy-mvebu-a3700-comphy: Remove broken reset support

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Date:   Mon, 29 Aug 2022 09:02:12 +0000
From:   Shinichiro Kawasaki <shinichiro.kawasaki@....com>
To:     Pali Rohár <pali@...nel.org>
CC:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Vinod Koul <vkoul@...nel.org>,
        Marek Behún <kabel@...nel.org>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "linux-phy@...ts.infradead.org" <linux-phy@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] phy: marvell: phy-mvebu-a3700-comphy: Remove broken reset
 support

On Aug 29, 2022 / 10:30, Pali Rohár wrote:
> Reset support for SATA PHY is somehow broken and after calling it, kernel
> is not able to detect and initialize SATA disk Samsung SSD 850 EMT0 [1].
> 
> Reset support was introduced in commit 934337080c6c ("phy: marvell:
> phy-mvebu-a3700-comphy: Add native kernel implementation") as part of
> complete rewrite of this driver. v1 patch series of that commit [2] did
> not contain reset support and was tested that is working fine with
> Ethernet, SATA and USB PHYs without issues too.
> 
> So for now remove broken reset support and change implementation of
> power_off callback to power off all functions on specified lane (and not
> only selected function) because during startup kernel does not know which
> function was selected and configured by bootloader. Same logic was used
> also in v1 patch series of that commit.
> 
> This change fixes issues with initialization of SATA disk Samsung SSD 850
> and disk is working again, like before mentioned commit.
> 
> Once problem with PHY reset callback is solved its functionality could be
> re-introduced. But for now it is unknown why it does not work.
> 
> [1] - https://lore.kernel.org/r/20220531124159.3e4lgn2v462irbtz@shindev/
> [2] - https://lore.kernel.org/r/20211028184242.22105-1-kabel@kernel.org/
> 
> Reported-by: Shinichiro Kawasaki <shinichiro.kawasaki@....com>
> Fixes: 934337080c6c ("phy: marvell: phy-mvebu-a3700-comphy: Add native kernel implementation")
> Cc: stable@...r.kernel.org # v5.18+
> Signed-off-by: Pali Rohár <pali@...nel.org>

Pali, thanks for your care. I confirmed that this patch avoids the error I
reported in the reference [1], and my SSD was detected on my espressobin board.
Looks good.

Tested-by: Shinichiro Kawasaki <shinichiro.kawasaki@....com>

-- 
Shin'ichiro Kawasaki