[PATCH net v1] net: phy: micrel: Correct bit assignment for MICREL_KSZ8_P1_ERRATA flag

The previous assignment of the phy_device quirk for the
MICREL_KSZ8_P1_ERRATA flag was incorrect, working only due to
coincidental conditions. Specifically:

- The flag MICREL_KSZ8_P1_ERRATA, intended for KSZ88xx switches, was
  mistakenly overlapping with the MICREL_PHY_FXEN and
  MICREL_PHY_50MHZ_CLK flags.
- MICREL_PHY_FXEN is used by the KSZ8041 PHY, and its related code path
  wasn't executed for KSZ88xx PHYs and other way around.
- Additionally, the code path associated with the MICREL_PHY_50MHZ_CLK
  flag wasn't executed for KSZ88xx either.

Fixes: 49011e0c1555d ("net: phy: micrel: ksz886x/ksz8081: add cabletest support")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 include/linux/micrel_phy.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h
index 8bef1ab62bba3..0cedbeb9167c3 100644
--- a/include/linux/micrel_phy.h
+++ b/include/linux/micrel_phy.h

@@ -43,7 +43,7 @@
 /* struct phy_device dev_flags definitions */
 #define MICREL_PHY_50MHZ_CLK	0x00000001
 #define MICREL_PHY_FXEN		0x00000002
-#define MICREL_KSZ8_P1_ERRATA	0x00000003
+#define MICREL_KSZ8_P1_ERRATA	BIT(3)
 
 #define MICREL_KSZ9021_EXTREG_CTRL	0xB
 #define MICREL_KSZ9021_EXTREG_DATA_WRITE	0xC

-- 
2.39.2

On Thu, Aug 31, 2023 at 01:04:27PM +0200, Oleksij Rempel wrote:

Please can you also convert the other two flags to use BIT() as well to
make the entire thing explicitly bit-orientated? Thanks.

-- 
RMK's Patch system: https://www.armlinux.org.uk/developer/patches/
FTTP is here! 80Mbps down 10Mbps up. Decent connectivity at last!

On Thu, Aug 31, 2023 at 12:20:17PM +0100, Russell King (Oracle) wrote:

On Thu, Aug 31, 2023 at 01:04:27PM +0200, Oleksij Rempel wrote:

quoted

The previous assignment of the phy_device quirk for the
MICREL_KSZ8_P1_ERRATA flag was incorrect, working only due to
coincidental conditions. Specifically:

- The flag MICREL_KSZ8_P1_ERRATA, intended for KSZ88xx switches, was
  mistakenly overlapping with the MICREL_PHY_FXEN and
  MICREL_PHY_50MHZ_CLK flags.
- MICREL_PHY_FXEN is used by the KSZ8041 PHY, and its related code path
  wasn't executed for KSZ88xx PHYs and other way around.
- Additionally, the code path associated with the MICREL_PHY_50MHZ_CLK
  flag wasn't executed for KSZ88xx either.

Fixes: 49011e0c1555d ("net: phy: micrel: ksz886x/ksz8081: add cabletest support")
Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
---
 include/linux/micrel_phy.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/micrel_phy.h b/include/linux/micrel_phy.h
index 8bef1ab62bba3..0cedbeb9167c3 100644
--- a/include/linux/micrel_phy.h
+++ b/include/linux/micrel_phy.h

@@ -43,7 +43,7 @@
 /* struct phy_device dev_flags definitions */
 #define MICREL_PHY_50MHZ_CLK	0x00000001
 #define MICREL_PHY_FXEN		0x00000002
-#define MICREL_KSZ8_P1_ERRATA	0x00000003
+#define MICREL_KSZ8_P1_ERRATA	BIT(3)

Please can you also convert the other two flags to use BIT() as well to
make the entire thing explicitly bit-orientated? Thanks.

Ack. This patch is for the net. The cleanup will got to the net-next.
Except clean up will be accepted for the net too?

Regards,
Oleksij
-- 
Pengutronix e.K.                           |                             |
Steuerwalder Str. 21                       | http://www.pengutronix.de/  |
31137 Hildesheim, Germany                  | Phone: +49-5121-206917-0    |
Amtsgericht Hildesheim, HRA 2686           | Fax:   +49-5121-206917-5555 |

On Thu, 31 Aug 2023 13:23:42 +0200 Oleksij Rempel wrote:

quoted

quoted

 /* struct phy_device dev_flags definitions */
 #define MICREL_PHY_50MHZ_CLK	0x00000001
 #define MICREL_PHY_FXEN		0x00000002
-#define MICREL_KSZ8_P1_ERRATA	0x00000003
+#define MICREL_KSZ8_P1_ERRATA	BIT(3)  

Please can you also convert the other two flags to use BIT() as well to
make the entire thing explicitly bit-orientated? Thanks.  

Ack. This patch is for the net. The cleanup will got to the net-next.
Except clean up will be accepted for the net too?

The change is simple enough, you can convert all three bits in the fix.
The commit message could more explicitly say that these defines are
supposed to be masks not bit positions, tho.