| From 7406ffc54e986b006993220da8d1c298efb9ddb7 Mon Sep 17 00:00:00 2001 |
| From: Kevin Hao <haokexin@gmail.com> |
| Date: Tue, 20 Mar 2018 09:44:52 +0800 |
| Subject: [PATCH 0554/1795] net: phy: Add general dummy stubs for MMD register |
| access |
| |
| For some phy devices, even though they don't support the MMD extended |
| register access, it does have some side effect if we are trying to |
| read/write the MMD registers via indirect method. So introduce general |
| dummy stubs for MMD register access which these devices can use to avoid |
| such side effect. |
| |
| Fixes: b6b5e8a69118 ("gianfar: Disable EEE autoneg by default") |
| Signed-off-by: Kevin Hao <haokexin@gmail.com> |
| Signed-off-by: David S. Miller <davem@davemloft.net> |
| (cherry picked from commit 5df7af85ecd88e8b5f1f31d6456c3cf38a8bbdda) |
| Signed-off-by: Simon Horman <horms+renesas@verge.net.au> |
| Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> |
| --- |
| drivers/net/phy/phy_device.c | 17 +++++++++++++++++ |
| include/linux/phy.h | 4 ++++ |
| 2 files changed, 21 insertions(+) |
| |
| diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c |
| index a174d05a9752..fe76e2c4022a 100644 |
| --- a/drivers/net/phy/phy_device.c |
| +++ b/drivers/net/phy/phy_device.c |
| @@ -1641,6 +1641,23 @@ int genphy_config_init(struct phy_device *phydev) |
| } |
| EXPORT_SYMBOL(genphy_config_init); |
| |
| +/* This is used for the phy device which doesn't support the MMD extended |
| + * register access, but it does have side effect when we are trying to access |
| + * the MMD register via indirect method. |
| + */ |
| +int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad, u16 regnum) |
| +{ |
| + return -EOPNOTSUPP; |
| +} |
| +EXPORT_SYMBOL(genphy_read_mmd_unsupported); |
| + |
| +int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum, |
| + u16 regnum, u16 val) |
| +{ |
| + return -EOPNOTSUPP; |
| +} |
| +EXPORT_SYMBOL(genphy_write_mmd_unsupported); |
| + |
| int genphy_suspend(struct phy_device *phydev) |
| { |
| int value; |
| diff --git a/include/linux/phy.h b/include/linux/phy.h |
| index dca9e926b88f..efc04c2d92c9 100644 |
| --- a/include/linux/phy.h |
| +++ b/include/linux/phy.h |
| @@ -879,6 +879,10 @@ static inline int genphy_no_soft_reset(struct phy_device *phydev) |
| { |
| return 0; |
| } |
| +int genphy_read_mmd_unsupported(struct phy_device *phdev, int devad, |
| + u16 regnum); |
| +int genphy_write_mmd_unsupported(struct phy_device *phdev, int devnum, |
| + u16 regnum, u16 val); |
| |
| /* Clause 45 PHY */ |
| int genphy_c45_restart_aneg(struct phy_device *phydev); |
| -- |
| 2.19.0 |
| |