linux-kernel - [PATCH] net: phy: meson-gxl: implement meson_gxl_phy

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Date:   Thu, 3 Aug 2023 23:07:34 -0400
From:   Da Xue <da@...re.computer>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH] net: phy: meson-gxl: implement meson_gxl_phy_resume()

After suspend and resume, the meson GXL internal PHY config needs to
be initialized again or the carrier cannot be found.

Signed-off-by: Luke Lu <luke.lu@...re.computer>
Reviewed-by: Da Xue <da@...re.computer>

---
 drivers/net/phy/meson-gxl.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index bb9b33b6b..c4a07e6f7 100644
--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -132,6 +132,18 @@ static int meson_gxl_config_init(struct phy_device *phydev)
  return 0;
 }

+static int meson_gxl_phy_resume(struct phy_device *phydev)
+{
+ int ret;
+
+ phy_clear_bits(phydev, MII_BMCR, BMCR_PDOWN);
+ ret = meson_gxl_config_init(phydev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
 /* This function is provided to cope with the possible failures of this phy
  * during aneg process. When aneg fails, the PHY reports that aneg is done
  * but the value found in MII_LPA is wrong:
@@ -196,7 +208,7 @@ static struct phy_driver meson_gxl_phy[] = {
  .config_intr = smsc_phy_config_intr,
  .handle_interrupt = smsc_phy_handle_interrupt,
  .suspend        = genphy_suspend,
- .resume         = genphy_resume,
+ .resume         = meson_gxl_phy_resume,
  .read_mmd = genphy_read_mmd_unsupported,
  .write_mmd = genphy_write_mmd_unsupported,
  }, {
--
2.39.2