From mboxrd@z Thu Jan 1 00:00:00 1970 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 0F7FE8F57 for ; Sun, 16 Jul 2023 20:44:57 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 80B82C433C7; Sun, 16 Jul 2023 20:44:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1689540296; bh=g2hguSafZg+GmzcksWcO1pOba7zrKI0L7w3SPFdmEYI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=0+6Qp7PMEaqaZtsKd0gysw0kfb6MipVfHTgWu4WrKytAf5jsYojnLy24KsT0AGdH0 ++ERmETSoiWIxZlR+5MHyjgbEa2nqdgs4XsxQcow7sLjP+5rn8k6ZByFNb31yabwck MIp+zCrbtRl20HgMTmU6wySBEi2H4XNk4D6Lbzc8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Siddharth Vadapalli , Lorenzo Pieralisi , Vignesh Raghavendra , Sasha Levin Subject: [PATCH 6.1 285/591] PCI: cadence: Fix Gen2 Link Retraining process Date: Sun, 16 Jul 2023 21:47:04 +0200 Message-ID: <20230716194931.267534625@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230716194923.861634455@linuxfoundation.org> References: <20230716194923.861634455@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Siddharth Vadapalli [ Upstream commit 0e12f830236928b6fadf40d917a7527f0a048d2f ] The Link Retraining process is initiated to account for the Gen2 defect in the Cadence PCIe controller in J721E SoC. The errata corresponding to this is i2085, documented at: https://www.ti.com/lit/er/sprz455c/sprz455c.pdf The existing workaround implemented for the errata waits for the Data Link initialization to complete and assumes that the link retraining process at the Physical Layer has completed. However, it is possible that the Physical Layer training might be ongoing as indicated by the PCI_EXP_LNKSTA_LT bit in the PCI_EXP_LNKSTA register. Fix the existing workaround, to ensure that the Physical Layer training has also completed, in addition to the Data Link initialization. Link: https://lore.kernel.org/r/20230315070800.1615527-1-s-vadapalli@ti.com Fixes: 4740b969aaf5 ("PCI: cadence: Retrain Link to work around Gen2 training defect") Signed-off-by: Siddharth Vadapalli Signed-off-by: Lorenzo Pieralisi Reviewed-by: Vignesh Raghavendra Signed-off-by: Sasha Levin --- .../controller/cadence/pcie-cadence-host.c | 27 +++++++++++++++++++ 1 file changed, 27 insertions(+) diff --git a/drivers/pci/controller/cadence/pcie-cadence-host.c b/drivers/pci/controller/cadence/pcie-cadence-host.c index 940c7dd701d68..5b14f7ee3c798 100644 --- a/drivers/pci/controller/cadence/pcie-cadence-host.c +++ b/drivers/pci/controller/cadence/pcie-cadence-host.c @@ -12,6 +12,8 @@ #include "pcie-cadence.h" +#define LINK_RETRAIN_TIMEOUT HZ + static u64 bar_max_size[] = { [RP_BAR0] = _ULL(128 * SZ_2G), [RP_BAR1] = SZ_2G, @@ -77,6 +79,27 @@ static struct pci_ops cdns_pcie_host_ops = { .write = pci_generic_config_write, }; +static int cdns_pcie_host_training_complete(struct cdns_pcie *pcie) +{ + u32 pcie_cap_off = CDNS_PCIE_RP_CAP_OFFSET; + unsigned long end_jiffies; + u16 lnk_stat; + + /* Wait for link training to complete. Exit after timeout. */ + end_jiffies = jiffies + LINK_RETRAIN_TIMEOUT; + do { + lnk_stat = cdns_pcie_rp_readw(pcie, pcie_cap_off + PCI_EXP_LNKSTA); + if (!(lnk_stat & PCI_EXP_LNKSTA_LT)) + break; + usleep_range(0, 1000); + } while (time_before(jiffies, end_jiffies)); + + if (!(lnk_stat & PCI_EXP_LNKSTA_LT)) + return 0; + + return -ETIMEDOUT; +} + static int cdns_pcie_host_wait_for_link(struct cdns_pcie *pcie) { struct device *dev = pcie->dev; @@ -118,6 +141,10 @@ static int cdns_pcie_retrain(struct cdns_pcie *pcie) cdns_pcie_rp_writew(pcie, pcie_cap_off + PCI_EXP_LNKCTL, lnk_ctl); + ret = cdns_pcie_host_training_complete(pcie); + if (ret) + return ret; + ret = cdns_pcie_host_wait_for_link(pcie); } return ret; -- 2.39.2