[OpenWrt-Devel] [PATCH 04/10] imx6: Add gen2 disable patch

[Pushpal Sidhu]

Disable pcie-gen2 in this kernel as the products meant to run it do not fall
within specification for it. Instead, leave only Gen1 enabled.

Signed-off-by: Tim Harvey <tharvey at gateworks.com>
Signed-off-by: Pushpal Sidhu <psidhu at gateworks.com>
---
 .../linux/imx6/patches-4.3/210-disable_gen2.patch  | 30 ++++++++++++++++++++++
 1 file changed, 30 insertions(+)
 create mode 100644 target/linux/imx6/patches-4.3/210-disable_gen2.patch

diff --git a/target/linux/imx6/patches-4.3/210-disable_gen2.patch b/target/linux/imx6/patches-4.3/210-disable_gen2.patch
new file mode 100644
index 0000000..8b3a010
--- /dev/null
+++ b/target/linux/imx6/patches-4.3/210-disable_gen2.patch
@@ -0,0 +1,30 @@
+Index: linux-4.3/drivers/pci/host/pci-imx6.c
+===================================================================
+--- linux-4.3.orig/drivers/pci/host/pci-imx6.c	2015-11-01 16:05:25.000000000 -0800
++++ linux-4.3/drivers/pci/host/pci-imx6.c	2015-12-18 10:39:45.015158318 -0800
+@@ -392,12 +392,15 @@
+ 	if (ret)
+ 		return ret;
+ 
++#if 0   /* Disable Gen2 */
+ 	/* Allow Gen2 mode after the link is up. */
+ 	tmp = readl(pp->dbi_base + PCIE_RC_LCR);
+ 	tmp &= ~PCIE_RC_LCR_MAX_LINK_SPEEDS_MASK;
+ 	tmp |= PCIE_RC_LCR_MAX_LINK_SPEEDS_GEN2;
+ 	writel(tmp, pp->dbi_base + PCIE_RC_LCR);
+-
++#else
++	dev_info(pp->dev, "Link: Gen2 disabled\n");
++#endif
+ 	/*
+ 	 * Start Directed Speed Change so the best possible speed both link
+ 	 * partners support can be negotiated.
+@@ -420,7 +423,7 @@
+ 	}
+ 
+ 	tmp = readl(pp->dbi_base + PCIE_RC_LCSR);
+-	dev_dbg(pp->dev, "Link up, Gen=%i\n", (tmp >> 16) & 0xf);
++	dev_info(pp->dev, "Link up, Gen=%i\n", (tmp >> 16) & 0xf);
+ 	return 0;
+ }
+ 
-- 
2.6.4
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