The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

To reproduce the conflict and resubmit, you may use the following commands:

git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-5.4.y git checkout FETCH_HEAD git cherry-pick -x 096516d092d54604d590827d05b1022c8f326639 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023082132-jaundice-applaud-eb72@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..

Possible dependencies:

096516d092d5 ("net: phy: broadcom: stub c45 read/write for 54810") 5a32fcdb1e68 ("net: phy: broadcom: Add statistics for all Gigabit PHYs") 1e2e61af1996 ("net: phy: broadcom: remove BCM5482 1000Base-BX support") 15772e4ddf3f ("net: phy: broadcom: remove use of ack_interrupt()") 4567d5c3eb9b ("net: phy: broadcom: implement generic .handle_interrupt() callback") b0ed0bbfb304 ("net: phy: broadcom: add support for BCM54811 PHY") 9d42205036d4 ("net: phy: bcm54140: Make a bunch of functions static") 6937602ed3f9 ("net: phy: add Broadcom BCM54140 support") 123aff2a789c ("net: phy: broadcom: Add support for BCM53125 internal PHYs") fe26821fa614 ("net: phy: broadcom: Wire suspend/resume for BCM54810") 0ececcfc9267 ("net: phy: broadcom: Allow BCM54810 to use bcm54xx_adjust_rxrefclk()") 75f4d8d10e01 ("net: phy: add Broadcom BCM84881 PHY driver") b9bcb95315fe ("net: phy: broadcom: add 1000Base-X support for BCM54616S")

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 096516d092d54604d590827d05b1022c8f326639 Mon Sep 17 00:00:00 2001 From: Justin Chen justin.chen@broadcom.com Date: Sat, 12 Aug 2023 21:41:47 -0700 Subject: [PATCH] net: phy: broadcom: stub c45 read/write for 54810

The 54810 does not support c45. The mmd_phy_indirect accesses return arbirtary values leading to odd behavior like saying it supports EEE when it doesn't. We also see that reading/writing these non-existent MMD registers leads to phy instability in some cases.

Fixes: b14995ac2527 ("net: phy: broadcom: Add BCM54810 PHY entry") Signed-off-by: Justin Chen justin.chen@broadcom.com Reviewed-by: Florian Fainelli florian.fainelli@broadcom.com Link: https://lore.kernel.org/r/1691901708-28650-1-git-send-email-justin.chen@broa... Signed-off-by: Jakub Kicinski kuba@kernel.org

diff --git a/drivers/net/phy/broadcom.c b/drivers/net/phy/broadcom.c index 59cae0d808aa..04b2e6eeb195 100644 --- a/drivers/net/phy/broadcom.c +++ b/drivers/net/phy/broadcom.c @@ -542,6 +542,17 @@ static int bcm54xx_resume(struct phy_device *phydev) return bcm54xx_config_init(phydev); }

+static int bcm54810_read_mmd(struct phy_device *phydev, int devnum, u16 regnum) +{ + return -EOPNOTSUPP; +} + +static int bcm54810_write_mmd(struct phy_device *phydev, int devnum, u16 regnum, + u16 val) +{ + return -EOPNOTSUPP; +} + static int bcm54811_config_init(struct phy_device *phydev) { int err, reg; @@ -1103,6 +1114,8 @@ static struct phy_driver broadcom_drivers[] = { .get_strings = bcm_phy_get_strings, .get_stats = bcm54xx_get_stats, .probe = bcm54xx_phy_probe, + .read_mmd = bcm54810_read_mmd, + .write_mmd = bcm54810_write_mmd, .config_init = bcm54xx_config_init, .config_aneg = bcm5481_config_aneg, .config_intr = bcm_phy_config_intr,