From patchwork Thu Aug 15 05:16:57 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: 819800 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 364561448EB; Thu, 15 Aug 2024 05:17:00 +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=1723699021; cv=none; b=gpKG2z6UUvM2jj8RTj2EJXz2vGcYtmJ3KcpYF3dmaxynAGGMapK0f2zsnbjSo3dxUuXL+3TOX2K5UIZSfkqArtN/oC3xjCwb7MN8fcC81Yi+oL/Vjxija26lA6/QdoIzfm/S02Fjz89t4s7KOA74IYiSxp83tZjx03AU5Rypx1o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723699021; c=relaxed/simple; bh=M0ZalJaR2cqaYtu21nRymj3MSV1IRF0NUOW7L0tD/OQ=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=kKso1CVgYcNuMCmXaWCKGVgQWa4RwOxcCwpnHLbdGb3AmRuFOIuKfVBk2sLc1gsQ6r3QRtfplRNgpjnM+85Nvva7pmK0Jz31WlVEy3RJPxdDgV3vYUDhzDvMQM0qshe8geo7TBjxA8a+5pvP68OC0wr7fMeEhv3IYyx+cQagRc4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Y5V6fmyK; 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="Y5V6fmyK" Received: by smtp.kernel.org (Postfix) with ESMTPS id BA714C4AF0D; Thu, 15 Aug 2024 05:17:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723699020; bh=M0ZalJaR2cqaYtu21nRymj3MSV1IRF0NUOW7L0tD/OQ=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=Y5V6fmyK2CE3DXYntItXgXd1y+1xieyIhg4zl47jlfIhJZoJ0cUfYUDIDV2hA1eSw 3IJhaDHYaKKNUsdvKlEhFyMXcR2RauHebbTpBvNy9La9lcrbYoWEB/78Kx4NroNWWg nl7RS0ee6diDbPw5yxjvDF1KDCxp+RE9pYE4Qb+0kqzghOiLZWKqFQADsR+vgPA+Ch EgbPs3J1OuN3/9kkJuJmmsgbCseljf4oUuUYDIywpGtCnUSjBKyTzTcqXR6gg1jPzP uhl16XacYIo7psjwZT+Rm8XlCtB8V/Xoo5Flhp8u2medXfjpyL36ubPwJqoaa5g3PH GjGnMlEQAE7tw== 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 AF30DC52D7F; Thu, 15 Aug 2024 05:17:00 +0000 (UTC) From: Manivannan Sadhasivam via B4 Relay Date: Thu, 15 Aug 2024 10:46:57 +0530 Subject: [PATCH v2 2/3] ufs: core: Add a quirk for handling broken LSDBS field in controller capabilities register Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240815-ufs-bug-fix-v2-2-b373afae888f@linaro.org> References: <20240815-ufs-bug-fix-v2-0-b373afae888f@linaro.org> In-Reply-To: <20240815-ufs-bug-fix-v2-0-b373afae888f@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=1982; i=manivannan.sadhasivam@linaro.org; h=from:subject:message-id; bh=MCIRPdIw7ETAreNWkpU0sRIHAGg28eU3fllnElqMe2c=; b=owEBbQGS/pANAwAKAVWfEeb+kc71AcsmYgBmvY9K42XDU3zXkh8FTpsrZGIqprZAcOJUKh6e5 LYBQbLGUpKJATMEAAEKAB0WIQRnpUMqgUjL2KRYJ5dVnxHm/pHO9QUCZr2PSgAKCRBVnxHm/pHO 9d5UCACQsRMTBjEYzY25J46wBA0oF+Efi6dHqYgYJnNyd9Ed3kgAuLh0S9/FvKP4vIpLQtOmBCm SolfhpoHqvGg4/lj313fwwOoY3BlGqJBAjRO2ruTMb8QJnTSn0WeMC9eXDZJ9sLIW1ZwB3Q/cbF ILstaNVW9sRcPITMglvKi3+GQu4TbDmsQmiVME6Nq/Sc7eCxjWYSq77umg6VOBRcuwIls4xzRnk w9ePwQVYmYjuKZDWkXuoI1JXyJ+bdH239tCOBqa4qN7do/Omk2WXaJFTRIwonXEIRFJpdlz3B/p 1PcsYCGvY5R/EcUaGCbBiTD1cFdLR7wkVxyATHqkSUzUIQou 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 be reserved for UFSHCI 3.0 based controllers and should read as 0. But some controllers may report bogus value of 1 due to the hardware bug. 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 --- drivers/ufs/core/ufshcd.c | 6 +++++- include/ufs/ufshcd.h | 7 +++++++ 2 files changed, 12 insertions(+), 1 deletion(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 0b1787074215..8c9ff8696bcd 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->lsdbs_sup = !FIELD_GET(MASK_LSDBS_SUPPORT, hba->capabilities); + if (!(hba->quirks & UFSHCD_QUIRK_BROKEN_LSDBS_CAP)) + hba->lsdbs_sup = !FIELD_GET(MASK_LSDBS_SUPPORT, hba->capabilities); + else + hba->lsdbs_sup = true; + if (!hba->mcq_sup) return 0; diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index c6ab1c671ad7..250adb6eddb6 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -676,6 +676,13 @@ enum ufshcd_quirks { * the standard best practice for managing keys). */ UFSHCD_QUIRK_KEYS_IN_PRDT = 1 << 24, + + /* + * This quirk needs to be enabled if the host controller has the broken + * Legacy Queue & Single Doorbell Support (LSDBS) field in Controller + * Capabilities register. + */ + UFSHCD_QUIRK_BROKEN_LSDBS_CAP = 1 << 25, }; enum ufshcd_caps {