From: Chaithrika U S <[EMAIL PROTECTED]>
Registers a board fixup for Intel LXT971 PHY on DaVinci to increase the transmit
signal strength - a fix for transmit lockup issue.
Signed-off-by: Chaithrika U S <[EMAIL PROTECTED]>
---
arch/arm/mach-davinci/board-dm644x-evm.c | 22 ++++++++++++++++++++++
1 files changed, 22 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-davinci/board-dm644x-evm.c
b/arch/arm/mach-davinci/board-dm644x-evm.c
index be0e856..1fad659 100644
--- a/arch/arm/mach-davinci/board-dm644x-evm.c
+++ b/arch/arm/mach-davinci/board-dm644x-evm.c
@@ -25,6 +25,7 @@
#include <linux/mtd/partitions.h>
#include <linux/mtd/physmap.h>
#include <linux/io.h>
+#include <linux/phy.h>
#include <asm/setup.h>
#include <asm/mach-types.h>
@@ -48,6 +49,9 @@
#define DAVINCI_ASYNC_EMIF_DATA_CE2_BASE 0x06000000
#define DAVINCI_ASYNC_EMIF_DATA_CE3_BASE 0x08000000
+#define LXT971_PHY_ID (0x001378e2)
+#define LXT971_PHY_MASK (0xfffffff0)
+
static struct mtd_partition davinci_evm_norflash_partitions[] = {
/* bootloader (U-Boot, etc) in first 4 sectors */
{
@@ -487,6 +491,19 @@ davinci_evm_map_io(void)
davinci_map_common_io();
}
+static int davinci_phy_fixup(struct phy_device *phydev)
+{
+ unsigned int control;
+ /* CRITICAL: Fix for increasing PHY signal drive strength for
+ * TX lockup issue. On DaVinci EVM, the Intel LXT971 PHY
+ * signal strength was low causing TX to fail randomly. The
+ * fix is to Set bit 11 (Increased MII drive strength) of PHY
+ * register 26 (Digital Config register) on this phy. */
+ control = phy_read(phydev, 26);
+ phy_write(phydev, 26, (control | 0x800));
+ return 0;
+}
+
static __init void davinci_evm_init(void)
{
davinci_psc_init();
@@ -509,6 +526,11 @@ static __init void davinci_evm_init(void)
/* irlml6401 sustains over 3A, switches 5V in under 8 msec */
setup_usb(500, 8);
+
+ /* Register the fixup for PHY on DaVinci */
+ phy_register_fixup_for_uid(LXT971_PHY_ID, LXT971_PHY_MASK,
+ davinci_phy_fixup);
+
}
static __init void davinci_evm_irq_init(void)
--
1.5.4.1
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