From patchwork Fri Aug 16 06:25:10 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Manivannan Sadhasivam via B4 Relay X-Patchwork-Id: 13765488 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9F40C84A35; Fri, 16 Aug 2024 06:25:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723789513; cv=none; b=VirOiFmomP6NtfuHGzWO0R8z3W5EtqGdhQ28TKUdzo/q/XMg/rHvmq1zkOOMSrIkrj+lotrBQ+Q2X2dhJ92lGmobMJ2yFFRPSZUaxa6p/4sLvBeLKApN1cZfHECGdJAf+RrOaqXEDldYOy5q4f19kFOAkx0ERjihmr3f2aeIlhM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723789513; c=relaxed/simple; bh=+Bc0qNiXVeDnqjahtGmYe+yF38JSKtFQp32reVaFCLM=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QmhcHWAwW/Nzves6BsYsYL3K5NsYRTc+hf9yuBiBG4zddAe6KS2nUnYrQh/hYxIDpkdVYD7pRa4soDrcVOdub5XiKAV8xFZgczkKxKVTIjeq4tufIaOS/nl1NWBSvuhFXK7HdWQq0OztDtXirdgqLqk4P+oueZuJ3psZMfn3urw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qMxGgpNv; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qMxGgpNv" Received: by smtp.kernel.org (Postfix) with ESMTPS id 30A99C4AF09; Fri, 16 Aug 2024 06:25:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723789513; bh=+Bc0qNiXVeDnqjahtGmYe+yF38JSKtFQp32reVaFCLM=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=qMxGgpNvpldUukpFrucpx4M9LM24TJvzL/JBh1ydEtRU1+opqGmWJrGmAUsCXYpag m7IhrhKLmmM9VR3mv6m/+aW5NHWximqKKc9fsHVlZDe2pnSGdA3y9fgc1y08pZqfoE kN63Y5pjEb+tzy7Yd4SCRau04SuEoDtEfE9Hj0Til1ZG0fs6odiU6LWZbmPXyaRTyF CCKwDSHRaVZ+Ih9kJiKJlbiFWwk3Pc/X7bhHR4Cn/1HPCy1o+WWShR8AIWDbSa532I 0qAVEaM+FfdZAVAKrG1ZYVKzkRs/oKJ/SCKcGU9BHlRhn+JPwKtew+s9hIBKWaYD73 1MkmJQtHnn0wg== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E240C531DF; Fri, 16 Aug 2024 06:25:13 +0000 (UTC) From: Manivannan Sadhasivam via B4 Relay Date: Fri, 16 Aug 2024 11:55:10 +0530 Subject: [PATCH v3 1/2] ufs: core: Add a quirk for handling broken LSDBS field in controller capabilities register Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240816-ufs-bug-fix-v3-1-e6fe0e18e2a3@linaro.org> References: <20240816-ufs-bug-fix-v3-0-e6fe0e18e2a3@linaro.org> In-Reply-To: <20240816-ufs-bug-fix-v3-0-e6fe0e18e2a3@linaro.org> To: Alim Akhtar , Avri Altman , Bart Van Assche , "James E.J. Bottomley" , "Martin K. Petersen" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, Kyoungrul Kim , Amit Pundir , Manivannan Sadhasivam X-Mailer: b4 0.14.1 X-Developer-Signature: v=1; a=openpgp-sha256; l=2110; i=manivannan.sadhasivam@linaro.org; h=from:subject:message-id; bh=SPYkfqfo4Q1r17yald0viJ0Kdv4k2BQ9xtG4Fmr+8+w=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBmvvDHq0jzkKSUn4HFBas0ngL6QLNvB73pon7rx Uduh/cpjtWJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCZr7wxwAKCRBVnxHm/pHO 9WRQCACLKRBqWESX7mELXEcfRVYlDNQ46hVNTfetT3ZhALCtfZc/t5UeaxTxoXuVF98Hb7SLQvS eVRduCS+H7Q8jUML7CwjWPBl2TsaW/U+EOd6mKfXdHQekAo5owyBvFEUE+7Y5dqQwGNiQlyXreB /YV5LeFg5AsESejFe/5vu/sTcftEGSOaTjlL2toiY3YjRrcFN4q2QjWsHtCq109pCXx86PB3hVi xVdL7Cadq+IdOLwbsAqRC0SovO1ryf7EV0Jp7AksuTk7dxR20bftLxzkG8L2jSFMvkz/6/ppvq9 +IqO/NeVCTCeM+M7zkhFHvHmdnIwGgqiqixtNw/lHQbbdGZO X-Developer-Key: i=manivannan.sadhasivam@linaro.org; a=openpgp; fpr=C668AEC3C3188E4C611465E7488550E901166008 X-Endpoint-Received: by B4 Relay for manivannan.sadhasivam@linaro.org/default with auth_id=185 X-Original-From: Manivannan Sadhasivam Reply-To: manivannan.sadhasivam@linaro.org From: Manivannan Sadhasivam '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. Tested-by: Amit Pundir Signed-off-by: Manivannan Sadhasivam Reviewed-by: Bart Van Assche --- drivers/ufs/core/ufshcd.c | 6 +++++- include/ufs/ufshcd.h | 8 ++++++++ 2 files changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 0b3d0c8e0dda..a6f818cdef0e 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -2426,7 +2426,11 @@ static inline int ufshcd_hba_capabilities(struct ufs_hba *hba) * 0h: legacy single doorbell support is available * 1h: indicate that legacy single doorbell support has been removed */ - hba->lsdb_sup = !FIELD_GET(MASK_LSDB_SUPPORT, hba->capabilities); + if (!(hba->quirks & UFSHCD_QUIRK_BROKEN_LSDBS_CAP)) + hba->lsdb_sup = !FIELD_GET(MASK_LSDB_SUPPORT, hba->capabilities); + else + hba->lsdb_sup = true; + if (!hba->mcq_sup) return 0; diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index cac0cdb9a916..0fd2aebac728 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -676,6 +676,14 @@ enum ufshcd_quirks { * the standard best practice for managing keys). */ UFSHCD_QUIRK_KEYS_IN_PRDT = 1 << 24, + + /* + * This quirk indicates that the controller reports the value 1 (not + * supported) in the Legacy Single DoorBell Support (LSDBS) bit of the + * Controller Capabilities register although it supports the legacy + * single doorbell mode. + */ + UFSHCD_QUIRK_BROKEN_LSDBS_CAP = 1 << 25, }; enum ufshcd_caps {