On Wed, May 13, 2020 at 02:34:40PM +0200, Oleksij Rempel wrote:
> Add initial cable testing support.
> This PHY needs only 100usec for this test and it is recommended to run it
> before the link is up. For now, provide at least ethtool support, so it
> can be tested by more developers.
>
> This patch was tested with TJA1102 PHY with following results:
> - No cable, is detected as open
> - 1m cable, with no connected other end and detected as open
> - a 40m cable (out of spec, max lenght should be 15m) is detected as OK.
>
> Current patch do not provide polarity test support. This test would
> indicate not proper wire connection, where "+" wire of main phy is
> connected to the "-" wire of the link partner.
>
> Signed-off-by: Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx>
> ---
> drivers/net/phy/nxp-tja11xx.c | 106 +++++++++++++++++++++++++++++++++-
> 1 file changed, 105 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/net/phy/nxp-tja11xx.c b/drivers/net/phy/nxp-tja11xx.c
> index ca5f9d4dc57ed..8b743d25002b9 100644
> --- a/drivers/net/phy/nxp-tja11xx.c
> +++ b/drivers/net/phy/nxp-tja11xx.c
> @@ -5,6 +5,7 @@
> */
> #include <linux/delay.h>
> #include <linux/ethtool.h>
> +#include <linux/ethtool_netlink.h>
> #include <linux/kernel.h>
> #include <linux/mdio.h>
> #include <linux/mii.h>
> @@ -26,6 +27,7 @@
> #define MII_ECTRL_POWER_MODE_NO_CHANGE (0x0 << 11)
> #define MII_ECTRL_POWER_MODE_NORMAL (0x3 << 11)
> #define MII_ECTRL_POWER_MODE_STANDBY (0xc << 11)
> +#define MII_ECTRL_CABLE_TEST BIT(5)
> #define MII_ECTRL_CONFIG_EN BIT(2)
> #define MII_ECTRL_WAKE_REQUEST BIT(0)
>
> @@ -55,6 +57,11 @@
> #define MII_GENSTAT 24
> #define MII_GENSTAT_PLL_LOCKED BIT(14)
>
> +#define MII_EXTSTAT 25
> +#define MII_EXTSTAT_SHORT_DETECT BIT(8)
> +#define MII_EXTSTAT_OPEN_DETECT BIT(7)
> +#define MII_EXTSTAT_POLARITY_DETECT BIT(6)
> +
Do these registers all conform to the standard? Can we pull this code
out into a library which all standards conformant PHY drivers can use?
The code itself looks O.K.
Andrew
