| Message ID | 20220729130346.2961889-2-o.rempel@pengutronix.de (mailing list archive) |
|---|---|
| State | Changes Requested |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | net: dsa: microchip: add error handling and register access validation | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Clearly marked for net-next |
| netdev/fixes_present | success | Fixes tag not required for -next series |
| netdev/subject_prefix | success | Link |
| netdev/cover_letter | success | Series has a cover letter |
| 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: 0 this patch: 0 |
| netdev/cc_maintainers | success | CCed 11 of 11 maintainers |
| netdev/build_clang | success | Errors and warnings before: 0 this patch: 0 |
| 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: 0 this patch: 0 |
| netdev/checkpatch | warning | CHECK: Please don't use multiple blank lines |
| netdev/kdoc | success | Errors and warnings before: 0 this patch: 0 |
| netdev/source_inline | success | Was 0 now: 0 |
diff --git a/drivers/net/dsa/microchip/ksz9477.c b/drivers/net/dsa/microchip/ksz9477.c index c108d5444695..841f0d2b15c9 100644 --- a/drivers/net/dsa/microchip/ksz9477.c +++ b/drivers/net/dsa/microchip/ksz9477.c @@ -264,6 +264,22 @@ void ksz9477_port_init_cnt(struct ksz_device *dev, int port) mutex_unlock(&mib->cnt_mutex); } + +static void ksz9477_r_phy_quirks(struct ksz_device *dev, u16 addr, u16 reg, + u16 *data) +{ + /* KSZ8563R do not have extended registers but BMSR_ESTATEN and + * BMSR_ERCAP bits are set. + * Since all KSZ9893 compatible chips, do not support extended + * registers, it should be save to apply this quirk on complete family. + * It is not possible to integrate this code in the PHY driver, since + * we can't use PHYid to distinguish Gbit capable KSZ9477 PHYs from + * 100Mbit KSZ8563R PHYs. + */ + if (dev->chip_id == KSZ9893_CHIP_ID && reg == MII_BMSR) + *data &= ~(BMSR_ESTATEN | BMSR_ERCAP); +} + void ksz9477_r_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 *data) { u16 val = 0xffff; @@ -308,6 +324,7 @@ void ksz9477_r_phy(struct ksz_device *dev, u16 addr, u16 reg, u16 *data) } } else { ksz_pread16(dev, addr, 0x100 + (reg << 1), &val); + ksz9477_r_phy_quirks(dev, addr, reg, &val); } *data = val;
This issue was detected after adding support of regmap_ranges for KSZ8563R chip. This chip is reporting extended registers support without having actual extended registers. This made PHYlib request not existing registers. Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de> --- drivers/net/dsa/microchip/ksz9477.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)