4.19-stable review patch. If anyone has any objections, please let me know.
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From: Parthiban Veerasooran Parthiban.Veerasooran@microchip.com
[ Upstream commit 52a2f0608366a629d43dacd3191039c95fef74ba ]
LED Select (LED_SEL) bit in the LED General Purpose IO Configuration register is used to determine the functionality of external LED pins (Speed Indicator, Link and Activity Indicator, Full Duplex Link Indicator). The default value for this bit is 0 when no EEPROM is present. If a EEPROM is present, the default value is the value of the LED Select bit in the Configuration Flags of the EEPROM. A USB Reset or Lite Reset (LRST) will cause this bit to be restored to the image value last loaded from EEPROM, or to be set to 0 if no EEPROM is present.
While configuring the dual purpose GPIO/LED pins to LED outputs in the LED General Purpose IO Configuration register, the LED_SEL bit is changed as 0 and resulting the configured value from the EEPROM is cleared. The issue is fixed by using read-modify-write approach.
Fixes: f293501c61c5 ("smsc95xx: configure LED outputs") Signed-off-by: Parthiban Veerasooran Parthiban.Veerasooran@microchip.com Reviewed-by: Simon Horman horms@kernel.org Reviewed-by: Woojung Huh woojung.huh@microchip.com Link: https://lore.kernel.org/r/20240523085314.167650-1-Parthiban.Veerasooran@micr... Signed-off-by: Paolo Abeni pabeni@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/usb/smsc95xx.c | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-)
diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c index ec233d033f5cd..22c1eac73f2c4 100644 --- a/drivers/net/usb/smsc95xx.c +++ b/drivers/net/usb/smsc95xx.c @@ -1036,7 +1036,7 @@ static int smsc95xx_phy_initialize(struct usbnet *dev) static int smsc95xx_reset(struct usbnet *dev) { struct smsc95xx_priv *pdata = dev->driver_priv; - u32 read_buf, write_buf, burst_cap; + u32 read_buf, burst_cap; int ret = 0, timeout;
netif_dbg(dev, ifup, dev->net, "entering smsc95xx_reset\n"); @@ -1178,10 +1178,13 @@ static int smsc95xx_reset(struct usbnet *dev) return ret; netif_dbg(dev, ifup, dev->net, "ID_REV = 0x%08x\n", read_buf);
+ ret = smsc95xx_read_reg(dev, LED_GPIO_CFG, &read_buf); + if (ret < 0) + return ret; /* Configure GPIO pins as LED outputs */ - write_buf = LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED | - LED_GPIO_CFG_FDX_LED; - ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, write_buf); + read_buf |= LED_GPIO_CFG_SPD_LED | LED_GPIO_CFG_LNK_LED | + LED_GPIO_CFG_FDX_LED; + ret = smsc95xx_write_reg(dev, LED_GPIO_CFG, read_buf); if (ret < 0) return ret;