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Subject[PATCH v4 4/4] net: phy: realtek: configure RTL8211E LEDs
Date
Configure the RTL8211E LEDs behavior when the device tree property
'realtek,led-modes' is specified.

Signed-off-by: Matthias Kaehlcke <mka@chromium.org>
---
Changes in v4:
- use the generic PHY LED binding
- keep default/current configuration if none is specified
- added rtl8211e_disable_eee_led_mode()
- was previously in separate patch, however since we always want to
disable EEE LED mode when a LED configuration is specified it makes
sense to just add the function here.
- don't call phy_restore_page() in rtl8211e_config_leds() if
selection of the extended page failed.
- use phydev_warn() instead of phydev_err() if LED configuration
fails since we don't bail out
- use hex number to specify page for consistency
- add hex number to comment about ext page 44 to facilitate searching
---
drivers/net/phy/realtek.c | 121 +++++++++++++++++++++++++++++++++++++-
1 file changed, 120 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c
index e09d3b0da2c7..46e3d77d41b6 100644
--- a/drivers/net/phy/realtek.c
+++ b/drivers/net/phy/realtek.c
@@ -9,8 +9,11 @@
* Copyright (c) 2004 Freescale Semiconductor, Inc.
*/
#include <linux/bitops.h>
-#include <linux/phy.h>
+#include <linux/bits.h>
#include <linux/module.h>
+#include <linux/phy.h>
+
+#define RTL821x_NUM_LEDS 3

#define RTL821x_PHYSR 0x11
#define RTL821x_PHYSR_DUPLEX BIT(13)
@@ -26,6 +29,19 @@
#define RTL821x_EXT_PAGE_SELECT 0x1e
#define RTL821x_PAGE_SELECT 0x1f

+/* RTL8211E page 5 */
+#define RTL8211E_EEE_LED_MODE1 0x05
+#define RTL8211E_EEE_LED_MODE2 0x06
+
+/* RTL8211E extension page 44 (0x2c) */
+#define RTL8211E_LACR 0x1a
+#define RLT8211E_LACR_LEDACTCTRL_SHIFT 4
+#define RLT8211E_LACR_LEDACTCTRL_MASK GENMASK(6, 4)
+#define RTL8211E_LCR 0x1c
+#define RTL8211E_LCR_LEDCTRL_MASK (GENMASK(2, 0) | \
+ GENMASK(6, 4) | \
+ GENMASK(10, 8))
+
#define RTL8211F_INSR 0x1d

#define RTL8211F_TX_DELAY BIT(8)
@@ -83,6 +99,105 @@ static int rtl8211e_modify_ext_paged(struct phy_device *phydev, int page,
return phy_restore_page(phydev, oldpage, ret);
}

+static void rtl8211e_disable_eee_led_mode(struct phy_device *phydev)
+{
+ int oldpage;
+ int err = 0;
+
+ oldpage = phy_select_page(phydev, 5);
+ if (oldpage < 0)
+ goto out;
+
+ /* write magic values to disable EEE LED mode */
+ err = __phy_write(phydev, RTL8211E_EEE_LED_MODE1, 0x8b82);
+ if (err)
+ goto out;
+
+ err = __phy_write(phydev, RTL8211E_EEE_LED_MODE2, 0x052b);
+
+out:
+ phy_restore_page(phydev, oldpage, err);
+}
+
+static int rtl8211e_config_leds(struct phy_device *phydev)
+{
+ int i, oldpage, ret;
+ u16 lacr_bits = 0, lcr_bits = 0;
+ u16 lacr_mask = RLT8211E_LACR_LEDACTCTRL_MASK;
+ u16 lcr_mask = RTL8211E_LCR_LEDCTRL_MASK;
+ bool eed_led_mode_disabled = false;
+
+ for (i = 0; i < RTL821x_NUM_LEDS; i++) {
+ struct phy_led_config cfg;
+
+ ret = of_get_phy_led_cfg(phydev, i, &cfg);
+ if (ret) {
+ lacr_mask &= ~BIT(4 + i);
+ lcr_mask &= ~GENMASK((i * 4) + 2, i * 4);
+ continue;
+ }
+
+ if (!eed_led_mode_disabled) {
+ rtl8211e_disable_eee_led_mode(phydev);
+ eed_led_mode_disabled = true;
+ }
+
+ switch (cfg.trigger) {
+ case PHY_LED_LINK_10M:
+ lcr_bits |= 1 << (i * 4);
+ break;
+
+ case PHY_LED_LINK_100M:
+ lcr_bits |= 2 << (i * 4);
+ break;
+
+ case PHY_LED_LINK_1G:
+ lcr_bits |= 4 << (i * 4);
+ break;
+
+ case PHY_LED_ACTIVITY:
+ lacr_bits |= BIT(RLT8211E_LACR_LEDACTCTRL_SHIFT + i);
+ break;
+
+ default:
+ phydev_warn(phydev,
+ "unknown trigger for LED%d: %d\n",
+ i, cfg.trigger);
+ }
+ }
+
+ oldpage = rtl8211e_select_ext_page(phydev, 0x2c);
+ if (oldpage < 0) {
+ phydev_err(phydev, "failed to select extended page: %d\n", oldpage);
+ return oldpage;
+ }
+
+ if (lacr_mask == 0)
+ goto skip_lacr;
+
+ ret = __phy_modify(phydev, RTL8211E_LACR,
+ lacr_mask, lacr_bits);
+ if (ret) {
+ phydev_err(phydev, "failed to write LACR reg: %d\n",
+ ret);
+ goto err;
+ }
+
+skip_lacr:
+ if (lcr_mask == 0)
+ goto skip_lcr;
+
+ ret = __phy_modify(phydev, RTL8211E_LCR,
+ lcr_mask, lcr_bits);
+ if (ret)
+ phydev_err(phydev, "failed to write LCR reg: %d\n",
+ ret);
+
+skip_lcr:
+err:
+ return phy_restore_page(phydev, oldpage, ret);
+}
+
static int rtl8201_ack_interrupt(struct phy_device *phydev)
{
int err;
@@ -217,6 +332,10 @@ static int rtl8211e_config_init(struct phy_device *phydev)
int ret;
u16 val;

+ ret = rtl8211e_config_leds(phydev);
+ if (ret)
+ phydev_warn(phydev, "LED configuration failed: %d\n", ret);
+
/* enable TX/RX delay for rgmii-* modes, and disable them for rgmii. */
switch (phydev->interface) {
case PHY_INTERFACE_MODE_RGMII:
--
2.22.0.770.g0f2c4a37fd-goog
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