From: Frank Wunderlich <linux@fw-web.de>
To: linux-mediatek@lists.infradead.org
Cc: "Frank Wunderlich" <frank-w@public-files.de>,
"Ryder Lee" <ryder.lee@mediatek.com>,
"Jianjun Wang" <jianjun.wang@mediatek.com>,
"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
"Rob Herring" <robh@kernel.org>,
"Krzysztof Wilczyński" <kw@linux.com>,
"Bjorn Helgaas" <bhelgaas@google.com>,
"Matthias Brugger" <matthias.bgg@gmail.com>,
linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH] PCI: mediatek-gen3: handle PERST after reset
Date: Sun, 2 Apr 2023 15:13:47 +0200 [thread overview]
Message-ID: <20230402131347.99268-1-linux@fw-web.de> (raw)
From: Frank Wunderlich <frank-w@public-files.de>
De-assert PERST in separate step after reset signals to fully comply
the PCIe CEM clause 2.2.
This fixes some NVME detection issues on mt7986.
Fixes: d3bf75b579b9 ("PCI: mediatek-gen3: Add MediaTek Gen3 driver for MT8192")
Signed-off-by: Frank Wunderlich <frank-w@public-files.de>
---
Patch is taken from user Ruslan aka RRKh61 (permitted me to send it
with me as author).
https://forum.banana-pi.org/t/bpi-r3-nvme-connection-issue/14563/17
---
drivers/pci/controller/pcie-mediatek-gen3.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
index b8612ce5f4d0..176b1a04565d 100644
--- a/drivers/pci/controller/pcie-mediatek-gen3.c
+++ b/drivers/pci/controller/pcie-mediatek-gen3.c
@@ -350,7 +350,13 @@ static int mtk_pcie_startup_port(struct mtk_gen3_pcie *pcie)
msleep(100);
/* De-assert reset signals */
- val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB | PCIE_PE_RSTB);
+ val &= ~(PCIE_MAC_RSTB | PCIE_PHY_RSTB | PCIE_BRG_RSTB);
+ writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG);
+
+ msleep(100);
+
+ /* De-assert PERST# signals */
+ val &= ~(PCIE_PE_RSTB);
writel_relaxed(val, pcie->base + PCIE_RST_CTRL_REG);
/* Check if the link is up or not */
--
2.34.1
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next reply other threads:[~2023-04-02 13:14 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-04-02 13:13 Frank Wunderlich [this message]
2023-04-26 17:41 ` Aw: [PATCH] PCI: mediatek-gen3: handle PERST after reset Frank Wunderlich
2023-04-27 8:31 ` Jianjun Wang (王建军)
2023-04-28 5:50 ` Frank Wunderlich
2023-04-29 3:15 ` Jianjun Wang (王建军)
2023-04-29 9:03 ` Frank Wunderlich
2023-05-01 7:51 ` Frank Wunderlich
2023-04-28 20:09 ` Bjorn Helgaas
-- strict thread matches above, loose matches on Subject: below --
2023-04-02 13:11 Frank Wunderlich
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