diff mbox series

[net-next,v2] net: phy: broadcom: Implement suspend/resume for AC131 and BCM5241

Message ID 20220815190725.2749403-1-f.fainelli@gmail.com (mailing list archive)
State Superseded
Delegated to: Netdev Maintainers
Headers show
Series [net-next,v2] net: phy: broadcom: Implement suspend/resume for AC131 and BCM5241 | expand

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netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
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netdev/cover_letter success Single patches do not need cover letters
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1367 this patch: 1367
netdev/cc_maintainers success CCed 10 of 10 maintainers
netdev/build_clang success Errors and warnings before: 3 this patch: 3
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1367 this patch: 1367
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 64 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Florian Fainelli Aug. 15, 2022, 7:07 p.m. UTC
Implement the suspend/resume procedure for the Broadcom AC131 and BCM5241 type
of PHYs (10/100 only) by entering the standard power down followed by the
proprietary standby mode in the auxiliary mode 4 shadow register. On resume,
the PHY software reset is enough to make it come out of standby mode so we can
utilize brcm_fet_config_init() as the resume hook.

Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
---
Changes in v2:

- utilize phy_modify() to write to MII_BRCM_FET_SHDW_AUXMODE4 (Russell)

 drivers/net/phy/broadcom.c | 39 ++++++++++++++++++++++++++++++++++++++
 include/linux/brcmphy.h    |  1 +
 2 files changed, 40 insertions(+)
diff mbox series

Patch

diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c
index 31fbcdddc9ad..ad71c88c87e7 100644
--- a/drivers/net/phy/broadcom.c
+++ b/drivers/net/phy/broadcom.c
@@ -766,6 +766,41 @@  static irqreturn_t brcm_fet_handle_interrupt(struct phy_device *phydev)
 	return IRQ_HANDLED;
 }
 
+static int brcm_fet_suspend(struct phy_device *phydev)
+{
+	int reg, err, err2, brcmtest;
+
+	/* We cannot use a read/modify/write here otherwise the PHY continues
+	 * to drive LEDs which defeats the purpose of low power mode.
+	 */
+	err = phy_write(phydev, MII_BMCR, BMCR_PDOWN);
+	if (err < 0)
+		return err;
+
+	/* Enable shadow register access */
+	brcmtest = phy_read(phydev, MII_BRCM_FET_BRCMTEST);
+	if (brcmtest < 0)
+		return brcmtest;
+
+	reg = brcmtest | MII_BRCM_FET_BT_SRE;
+
+	err = phy_write(phydev, MII_BRCM_FET_BRCMTEST, reg);
+	if (err < 0)
+		return err;
+
+	/* Set standby mode */
+	err = phy_modify(phydev, MII_BRCM_FET_SHDW_AUXMODE4,
+			 MII_BRCM_FET_SHDW_AM4_STANDBY,
+			 MII_BRCM_FET_SHDW_AM4_STANDBY);
+
+	/* Disable shadow register access */
+	err2 = phy_write(phydev, MII_BRCM_FET_BRCMTEST, brcmtest);
+	if (!err)
+		err = err2;
+
+	return err;
+}
+
 static int bcm54xx_phy_probe(struct phy_device *phydev)
 {
 	struct bcm54xx_phy_priv *priv;
@@ -1033,6 +1068,8 @@  static struct phy_driver broadcom_drivers[] = {
 	.config_init	= brcm_fet_config_init,
 	.config_intr	= brcm_fet_config_intr,
 	.handle_interrupt = brcm_fet_handle_interrupt,
+	.suspend	= brcm_fet_suspend,
+	.resume		= brcm_fet_config_init,
 }, {
 	.phy_id		= PHY_ID_BCM5241,
 	.phy_id_mask	= 0xfffffff0,
@@ -1041,6 +1078,8 @@  static struct phy_driver broadcom_drivers[] = {
 	.config_init	= brcm_fet_config_init,
 	.config_intr	= brcm_fet_config_intr,
 	.handle_interrupt = brcm_fet_handle_interrupt,
+	.suspend	= brcm_fet_suspend,
+	.resume		= brcm_fet_config_init,
 }, {
 	.phy_id		= PHY_ID_BCM5395,
 	.phy_id_mask	= 0xfffffff0,
diff --git a/include/linux/brcmphy.h b/include/linux/brcmphy.h
index 6ff567ece34a..9e77165f3ef6 100644
--- a/include/linux/brcmphy.h
+++ b/include/linux/brcmphy.h
@@ -293,6 +293,7 @@ 
 #define MII_BRCM_FET_SHDW_MC_FAME	0x4000	/* Force Auto MDIX enable */
 
 #define MII_BRCM_FET_SHDW_AUXMODE4	0x1a	/* Auxiliary mode 4 */
+#define MII_BRCM_FET_SHDW_AM4_STANDBY	0x0008	/* Standby enable */
 #define MII_BRCM_FET_SHDW_AM4_LED_MASK	0x0003
 #define MII_BRCM_FET_SHDW_AM4_LED_MODE1 0x0001