linux-kernel - Re: [PATCH v3 1/2] ufs: core: Add a quirk for handling broken LSDBS field in controller capabilities register

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Message-ID: <36d30039-8e42-4f3d-9812-09f49b3c0e71@acm.org>
Date: Fri, 16 Aug 2024 10:16:48 -0700
From: Bart Van Assche <bvanassche@....org>
To: manivannan.sadhasivam@...aro.org, Alim Akhtar <alim.akhtar@...sung.com>,
 Avri Altman <avri.altman@....com>,
 "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
 "Martin K. Petersen" <martin.petersen@...cle.com>
Cc: linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, Kyoungrul Kim <k831.kim@...sung.com>,
 Amit Pundir <amit.pundir@...aro.org>
Subject: Re: [PATCH v3 1/2] ufs: core: Add a quirk for handling broken LSDBS
 field in controller capabilities register

On 8/15/24 11:25 PM, Manivannan Sadhasivam via B4 Relay wrote:
> 'Legacy Queue & Single Doorbell Support (LSDBS)' field in the controller
> capabilities register is supposed to report whether the legacy single
> doorbell mode is supported in the controller or not. But some controllers
> report '1' in this field which corresponds to 'LSDB not supported', but
> they indeed support LSDB. So let's add a quirk to handle those controllers.
> 
> If the quirk is enabled by the controller driver, then LSDBS register field
> will be ignored and legacy single doorbell mode is assumed to be enabled
> always.

Reviewed-by: Bart Van Assche <bvanassche@....org>