From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 85455C87FD1 for ; Tue, 5 Aug 2025 13:20:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc: To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=e9p5hJOFJmORKeIUrvS9SS3XXjAT2mdEK7agSKoUqt8=; b=24CVA8HkxmcW3SsLXG/bE3DCSi C5hPofFzuePqc0u76/TBaMLTKjKnau3BlDbNnYouf8ei2+N3frYzhan7NQXoYRWprWAQcgfA3716o kaUg++EkKsErPMUQuog9Yj+c4xdwJY8JSaMTHLiIRpClvHW9bnh+5titnVe28/aCXaQrzh0ayav8W oADxyxayvxqO7ZQ/f2lsXaLOi9P5IQ4AyqXldWmrC2eRqbPX7C4+4C5iDIBYmN2nsLNhX6n55pXMs XDAUL7fnbOxPGAwXmbinINBtS/phh/u/53y5XyTMDGmGX52Vsp5MRmdM9BkDB9NK6KwpEi/rdluKW BLrnXl8w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1ujHaO-0000000Cp8a-3fSw; Tue, 05 Aug 2025 13:20:12 +0000 Received: from nyc.source.kernel.org ([147.75.193.91]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1ujHQa-0000000CnSW-2blq; Tue, 05 Aug 2025 13:10:06 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by nyc.source.kernel.org (Postfix) with ESMTP id 6902BA56373; Tue, 5 Aug 2025 13:10:03 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9F4F3C4CEF0; Tue, 5 Aug 2025 13:10:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1754399403; bh=j7U811MvCczKTPp55NF7aXier6/JUb9EwI1J0Ri83Gg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PXegbcCQ2G0703osutbs6z8KjMDuVP3o9t8QXaN1TjpoaRtfu6ilLPqDoZoqaZhow 2IZmF6wdTwo6PImNx2GBRF/7QxLAg+0V7HIbR3uwtz5ivW0yYXQRaWf2yp6Kxev6JN FmgwuJirhWvg5Z+vxCcZS+YgtTKcrguOgyjn+3EXINm6bWV8aKDMnmkcMgj8LaiZFO 9QIdOWFSgm5Vs1rYnexe0x6W2cytxJ/wq9BkB8Frx3IxsRvsn1ci7qzYSbniEFYpra GhddW1USILHWdqqvgeNtBRVNThtEEKnYlkRhNATxgnnIEJMlu6KWackTAS7C2CXZ8t 8NoSnDthFgrmA== From: Sasha Levin To: patches@lists.linux.dev, stable@vger.kernel.org Cc: Geraldo Nascimento , Neil Armstrong , Vinod Koul , Sasha Levin , heiko@sntech.de, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: [PATCH AUTOSEL 6.16-6.6] phy: rockchip-pcie: Properly disable TEST_WRITE strobe signal Date: Tue, 5 Aug 2025 09:08:42 -0400 Message-Id: <20250805130945.471732-7-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250805130945.471732-1-sashal@kernel.org> References: <20250805130945.471732-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.16 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250805_061004_800174_2099FBE9 X-CRM114-Status: GOOD ( 17.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Geraldo Nascimento [ Upstream commit 25facbabc3fc33c794ad09d73f73268c0f8cbc7d ] pcie_conf is used to touch TEST_WRITE strobe signal. This signal should be enabled, a little time waited, and then disabled. Current code clearly was copy-pasted and never disables the strobe signal. Adjust the define. While at it, remove PHY_CFG_RD_MASK which has been unused since 64cdc0360811 ("phy: rockchip-pcie: remove unused phy_rd_cfg function"). Reviewed-by: Neil Armstrong Signed-off-by: Geraldo Nascimento Link: https://lore.kernel.org/r/d514d5d5627680caafa8b7548cbdfee4307f5440.1751322015.git.geraldogabriel@gmail.com Signed-off-by: Vinod Koul Signed-off-by: Sasha Levin --- LLM Generated explanations, may be completely bogus: ## Backport Status: YES This commit should be backported to stable kernel trees for the following reasons: ### Bug Analysis The commit fixes a clear programming bug where `PHY_CFG_WR_DISABLE` was incorrectly defined as `1` instead of `0`. Looking at the code in `phy_wr_cfg()` function (lines 100-120), the sequence is: 1. Write data and address to the configuration register 2. Wait 1 microsecond 3. Enable the TEST_WRITE strobe signal by writing `PHY_CFG_WR_ENABLE` (value 1) 4. Wait 1 microsecond 5. Intended to disable the strobe signal with `PHY_CFG_WR_DISABLE` However, since both `PHY_CFG_WR_ENABLE` and `PHY_CFG_WR_DISABLE` were defined as `1`, the strobe signal was never actually disabled. This means the PHY configuration writes were leaving the strobe signal permanently enabled, which is incorrect hardware programming. ### Impact Assessment 1. **Real bug affecting users**: This is a functional bug that affects all Rockchip PCIe PHY operations. The strobe signal being left enabled could cause: - Incorrect PHY configuration behavior - Potential power consumption issues - Possible hardware state corruption - Unpredictable PCIe link behavior 2. **Small and contained fix**: The change is minimal - just changing one define from `1` to `0`. This is exactly the type of targeted fix suitable for stable. 3. **Clear correctness**: The fix is obviously correct - a disable operation should use value `0`, not `1`. The bug appears to be a copy-paste error from the initial driver introduction in 2016 (commit fcffee3d54fca). 4. **Long-standing issue**: This bug has existed since the driver was first introduced in 2016, affecting all kernel versions with this driver. 5. **No architectural changes**: The fix doesn't introduce new features or change the driver architecture - it simply corrects an incorrect constant value. 6. **Low regression risk**: Changing the disable value from 1 to 0 is the correct behavior according to typical hardware programming patterns. The risk of regression is minimal since this fixes incorrect behavior rather than changing working functionality. ### Additional Context The commit also removes the unused `PHY_CFG_RD_MASK` define as cleanup, which was left over from commit 64cdc0360811. This is harmless cleanup that doesn't affect the backport decision. The commit message clearly describes the issue: the TEST_WRITE strobe signal should follow a pattern of enable→wait→disable, but the current code never actually disables it due to the incorrect define value. This meets all the criteria for stable backports: it fixes a real bug, is small and self-contained, has minimal risk, and corrects clearly incorrect behavior that has been present since driver introduction. drivers/phy/rockchip/phy-rockchip-pcie.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/phy/rockchip/phy-rockchip-pcie.c b/drivers/phy/rockchip/phy-rockchip-pcie.c index bd44af36c67a..63e88abc66c6 100644 --- a/drivers/phy/rockchip/phy-rockchip-pcie.c +++ b/drivers/phy/rockchip/phy-rockchip-pcie.c @@ -30,9 +30,8 @@ #define PHY_CFG_ADDR_SHIFT 1 #define PHY_CFG_DATA_MASK 0xf #define PHY_CFG_ADDR_MASK 0x3f -#define PHY_CFG_RD_MASK 0x3ff #define PHY_CFG_WR_ENABLE 1 -#define PHY_CFG_WR_DISABLE 1 +#define PHY_CFG_WR_DISABLE 0 #define PHY_CFG_WR_SHIFT 0 #define PHY_CFG_WR_MASK 1 #define PHY_CFG_PLL_LOCK 0x10 -- 2.39.5 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on 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h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=PXegbcCQ2G0703osutbs6z8KjMDuVP3o9t8QXaN1TjpoaRtfu6ilLPqDoZoqaZhow 2IZmF6wdTwo6PImNx2GBRF/7QxLAg+0V7HIbR3uwtz5ivW0yYXQRaWf2yp6Kxev6JN FmgwuJirhWvg5Z+vxCcZS+YgtTKcrguOgyjn+3EXINm6bWV8aKDMnmkcMgj8LaiZFO 9QIdOWFSgm5Vs1rYnexe0x6W2cytxJ/wq9BkB8Frx3IxsRvsn1ci7qzYSbniEFYpra GhddW1USILHWdqqvgeNtBRVNThtEEKnYlkRhNATxgnnIEJMlu6KWackTAS7C2CXZ8t 8NoSnDthFgrmA== From: Sasha Levin To: patches@lists.linux.dev, stable@vger.kernel.org Cc: Geraldo Nascimento , Neil Armstrong , Vinod Koul , Sasha Levin , heiko@sntech.de, linux-arm-kernel@lists.infradead.org, linux-rockchip@lists.infradead.org Subject: [PATCH AUTOSEL 6.16-6.6] phy: rockchip-pcie: Properly disable TEST_WRITE strobe signal Date: Tue, 5 Aug 2025 09:08:42 -0400 Message-Id: <20250805130945.471732-7-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250805130945.471732-1-sashal@kernel.org> References: <20250805130945.471732-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: 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