From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>, Rob Herring <robh@kernel.org>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Neil Armstrong <narmstrong@baylibre.com>,
Marc Zyngier <maz@kernel.org>,
linux-pci@vger.kernel.org, linux-amlogic@lists.infradead.org,
linux-arm-kernel@lists.infradead.org
Subject: [PATCH AUTOSEL 5.7 259/388] PCI: amlogic: meson: Don't use FAST_LINK_MODE to set up link
Date: Wed, 17 Jun 2020 21:05:56 -0400 [thread overview]
Message-ID: <20200618010805.600873-259-sashal@kernel.org> (raw)
In-Reply-To: <20200618010805.600873-1-sashal@kernel.org>
From: Marc Zyngier <maz@kernel.org>
[ Upstream commit 87dccf09323fc363bd0d072fcc12b96622ab8c69 ]
The vim3l board does not work with a standard PCIe switch (ASM1184e),
spitting all kind of errors - hinting at HW misconfiguration (no link,
port enumeration issues, etc).
According to the the Synopsys DWC PCIe Reference Manual, in the section
dedicated to the PLCR register, bit 7 is described (FAST_LINK_MODE) as:
"Sets all internal timers to fast mode for simulation purposes."
it is sound to set this bit from a simulation perspective, but on actual
silicon, which expects timers to have a nominal value, it is not.
Make sure the FAST_LINK_MODE bit is cleared when configuring the RC
to solve this problem.
Link: https://lore.kernel.org/r/20200429164230.309922-1-maz@kernel.org
Fixes: 9c0ef6d34fdb ("PCI: amlogic: Add the Amlogic Meson PCIe controller driver")
Signed-off-by: Marc Zyngier <maz@kernel.org>
[lorenzo.pieralisi@arm.com: commit log]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pci/controller/dwc/pci-meson.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/pci/controller/dwc/pci-meson.c b/drivers/pci/controller/dwc/pci-meson.c
index 3715dceca1bf..ca59ba9e0ecd 100644
--- a/drivers/pci/controller/dwc/pci-meson.c
+++ b/drivers/pci/controller/dwc/pci-meson.c
@@ -289,11 +289,11 @@ static void meson_pcie_init_dw(struct meson_pcie *mp)
meson_cfg_writel(mp, val, PCIE_CFG0);
val = meson_elb_readl(mp, PCIE_PORT_LINK_CTRL_OFF);
- val &= ~LINK_CAPABLE_MASK;
+ val &= ~(LINK_CAPABLE_MASK | FAST_LINK_MODE);
meson_elb_writel(mp, val, PCIE_PORT_LINK_CTRL_OFF);
val = meson_elb_readl(mp, PCIE_PORT_LINK_CTRL_OFF);
- val |= LINK_CAPABLE_X1 | FAST_LINK_MODE;
+ val |= LINK_CAPABLE_X1;
meson_elb_writel(mp, val, PCIE_PORT_LINK_CTRL_OFF);
val = meson_elb_readl(mp, PCIE_GEN2_CTRL_OFF);
--
2.25.1
_______________________________________________
linux-amlogic mailing list
linux-amlogic@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-amlogic
next prev parent reply other threads:[~2020-06-18 1:28 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20200618010805.600873-1-sashal@kernel.org>
2020-06-18 1:01 ` [PATCH AUTOSEL 5.7 021/388] arm64: dts: meson-gxbb-kii-pro: fix board compatible Sasha Levin
2020-06-18 1:02 ` [PATCH AUTOSEL 5.7 024/388] arm64: dts: meson: fixup SCP sram nodes Sasha Levin
2020-06-18 1:03 ` [PATCH AUTOSEL 5.7 094/388] ASoC: meson: fix memory leak of links if allocation of ldata fails Sasha Levin
2020-06-18 1:03 ` [PATCH AUTOSEL 5.7 103/388] ASoC: meson: add missing free_irq() in error path Sasha Levin
2020-06-18 1:04 ` [PATCH AUTOSEL 5.7 151/388] clk: meson: meson8b: Fix the first parent of vid_pll_in_sel Sasha Levin
2020-06-18 1:04 ` [PATCH AUTOSEL 5.7 152/388] clk: meson: meson8b: Fix the polarity of the RESET_N lines Sasha Levin
2020-06-18 1:04 ` [PATCH AUTOSEL 5.7 153/388] clk: meson: meson8b: Fix the vclk_div{1, 2, 4, 6, 12}_en gate bits Sasha Levin
2020-06-18 1:04 ` [PATCH AUTOSEL 5.7 158/388] arm64: dts: meson-g12b-ugoos-am6: fix board compatible Sasha Levin
2020-06-18 1:04 ` [PATCH AUTOSEL 5.7 159/388] arm64: dts: meson: fix leds subnodes name Sasha Levin
2020-06-18 1:04 ` [PATCH AUTOSEL 5.7 161/388] clk: meson: meson8b: Don't rely on u-boot to init all GP_PLL registers Sasha Levin
2020-06-18 1:04 ` [PATCH AUTOSEL 5.7 168/388] usb: dwc3: meson-g12a: check return of dwc3_meson_g12a_usb_init Sasha Levin
2020-06-18 1:05 ` [PATCH AUTOSEL 5.7 239/388] ARM: dts: meson: Switch existing boards with RGMII PHY to "rgmii-id" Sasha Levin
2020-06-18 1:05 ` Sasha Levin [this message]
2020-06-18 1:06 ` [PATCH AUTOSEL 5.7 305/388] usb: dwc3: meson-g12a: fix error path when fetching the reset line fails Sasha Levin
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