[PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

[PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

[Tommaso Merciai]

RGMII mode can be enable from dp83822 straps, and also writing bit 9
of register 0x17 - RMII and Status Register (RCSR).
When phy_interface_is_rgmii rgmii mode must be enabled, same for
contrary, this prevents malconfigurations of hw straps

References:
 - https://www.ti.com/lit/gpn/dp83822i p66

Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
Suggested-by: Alberto Bianchi <alberto.bianchi@amarulasolutions.com>
Tested-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
---
Changes since v2:
 - Fix comment of register name RSCR -> RCSR
 - Fix define DP83822_RGMII_MODE_EN location

Changes since v1:
 - Improve commit msg
 - Add definition of bit 9 reg rcsr (rgmii mode en)
 - Handle case: phy_interface_is_rgmii is false

 drivers/net/phy/dp83822.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
index ce17b2af3218..e6ad3a494d32 100644
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -94,7 +94,8 @@
 #define DP83822_WOL_INDICATION_SEL BIT(8)
 #define DP83822_WOL_CLR_INDICATION BIT(11)
 
-/* RSCR bits */
+/* RCSR bits */
+#define DP83822_RGMII_MODE_EN	BIT(9)
 #define DP83822_RX_CLK_SHIFT	BIT(12)
 #define DP83822_TX_CLK_SHIFT	BIT(11)
 
@@ -408,6 +409,12 @@ static int dp83822_config_init(struct phy_device *phydev)
 			if (err)
 				return err;
 		}
+
+		phy_set_bits_mmd(phydev, DP83822_DEVADDR,
+					MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
+	} else {
+		phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
+					MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
 	}
 
 	if (dp83822->fx_enabled) {
-- 
2.25.1

Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

[Andrew Lunn]

On Sat, May 21, 2022 at 01:58:46AM +0200, Tommaso Merciai wrote:
> RGMII mode can be enable from dp83822 straps, and also writing bit 9
> of register 0x17 - RMII and Status Register (RCSR).
> When phy_interface_is_rgmii rgmii mode must be enabled, same for
> contrary, this prevents malconfigurations of hw straps
> 
> References:
>  - https://www.ti.com/lit/gpn/dp83822i p66
> 
> Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
> Suggested-by: Alberto Bianchi <alberto.bianchi@amarulasolutions.com>
> Tested-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

If you want to, you could go further. If bit 9 is clear, bit 5 defines
the mode, either RMII or MII. There are interface modes defined for
these, so you could get bit 5 as well.

    Andrew

Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

[Tommaso Merciai]

On Sat, May 21, 2022 at 08:39:02PM +0200, Andrew Lunn wrote:
> On Sat, May 21, 2022 at 01:58:46AM +0200, Tommaso Merciai wrote:
> > RGMII mode can be enable from dp83822 straps, and also writing bit 9
> > of register 0x17 - RMII and Status Register (RCSR).
> > When phy_interface_is_rgmii rgmii mode must be enabled, same for
> > contrary, this prevents malconfigurations of hw straps
> > 
> > References:
> >  - https://www.ti.com/lit/gpn/dp83822i p66
> > 
> > Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> > Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
> > Suggested-by: Alberto Bianchi <alberto.bianchi@amarulasolutions.com>
> > Tested-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> 
> Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> 
> If you want to, you could go further. If bit 9 is clear, bit 5 defines
> the mode, either RMII or MII. There are interface modes defined for
> these, so you could get bit 5 as well.

Hi Andrew,
Thanks for the review and for your time.
I'll try to go further, like you suggest :)

Regards,
Tommaso

> 
>     Andrew

-- 
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@amarulasolutions.com
__________________________________

Amarula Solutions SRL
Via Le Canevare 30, 31100 Treviso, Veneto, IT
T. +39 042 243 5310
info@amarulasolutions.com
www.amarulasolutions.com

Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

[Andrew Lunn]

On Mon, May 23, 2022 at 08:57:54AM +0200, Tommaso Merciai wrote:
> On Sat, May 21, 2022 at 08:39:02PM +0200, Andrew Lunn wrote:
> > On Sat, May 21, 2022 at 01:58:46AM +0200, Tommaso Merciai wrote:
> > > RGMII mode can be enable from dp83822 straps, and also writing bit 9
> > > of register 0x17 - RMII and Status Register (RCSR).
> > > When phy_interface_is_rgmii rgmii mode must be enabled, same for
> > > contrary, this prevents malconfigurations of hw straps
> > > 
> > > References:
> > >  - https://www.ti.com/lit/gpn/dp83822i p66
> > > 
> > > Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> > > Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
> > > Suggested-by: Alberto Bianchi <alberto.bianchi@amarulasolutions.com>
> > > Tested-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> > 
> > Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> > 
> > If you want to, you could go further. If bit 9 is clear, bit 5 defines
> > the mode, either RMII or MII. There are interface modes defined for
> > these, so you could get bit 5 as well.
> 
> Hi Andrew,
> Thanks for the review and for your time.
> I'll try to go further, like you suggest :)

Hi Tomaso

This patch has been accepted, so you will need to submit an
incremental patch. I also expect net-next to close soon for the merge
window, so you might want to wait two weeks before submitting.

	Andrew

Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

[Tommaso Merciai]

On Mon, May 23, 2022 at 02:16:56PM +0200, Andrew Lunn wrote:
> On Mon, May 23, 2022 at 08:57:54AM +0200, Tommaso Merciai wrote:
> > On Sat, May 21, 2022 at 08:39:02PM +0200, Andrew Lunn wrote:
> > > On Sat, May 21, 2022 at 01:58:46AM +0200, Tommaso Merciai wrote:
> > > > RGMII mode can be enable from dp83822 straps, and also writing bit 9
> > > > of register 0x17 - RMII and Status Register (RCSR).
> > > > When phy_interface_is_rgmii rgmii mode must be enabled, same for
> > > > contrary, this prevents malconfigurations of hw straps
> > > > 
> > > > References:
> > > >  - https://www.ti.com/lit/gpn/dp83822i p66
> > > > 
> > > > Signed-off-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> > > > Co-developed-by: Michael Trimarchi <michael@amarulasolutions.com>
> > > > Suggested-by: Alberto Bianchi <alberto.bianchi@amarulasolutions.com>
> > > > Tested-by: Tommaso Merciai <tommaso.merciai@amarulasolutions.com>
> > > 
> > > Reviewed-by: Andrew Lunn <andrew@lunn.ch>
> > > 
> > > If you want to, you could go further. If bit 9 is clear, bit 5 defines
> > > the mode, either RMII or MII. There are interface modes defined for
> > > these, so you could get bit 5 as well.
> > 
> > Hi Andrew,
> > Thanks for the review and for your time.
> > I'll try to go further, like you suggest :)
> 
> Hi Tomaso
> 
> This patch has been accepted, so you will need to submit an
> incremental patch. I also expect net-next to close soon for the merge
> window, so you might want to wait two weeks before submitting.
> 
> 	Andrew


Hi Andrew,
Thanks for the info. I'll wait for the close of the merge window
then.

Regards,
Tommaso

-- 
Tommaso Merciai
Embedded Linux Engineer
tommaso.merciai@amarulasolutions.com
__________________________________

Amarula Solutions SRL
Via Le Canevare 30, 31100 Treviso, Veneto, IT
T. +39 042 243 5310
info@amarulasolutions.com
www.amarulasolutions.com

Re: [PATCH v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net-next.git (master)
by David S. Miller <davem@davemloft.net>:

On Sat, 21 May 2022 01:58:46 +0200 you wrote:
> RGMII mode can be enable from dp83822 straps, and also writing bit 9
> of register 0x17 - RMII and Status Register (RCSR).
> When phy_interface_is_rgmii rgmii mode must be enabled, same for
> contrary, this prevents malconfigurations of hw straps
> 
> References:
>  - https://www.ti.com/lit/gpn/dp83822i p66
> 
> [...]

Here is the summary with links:
  - [v3] net: phy: DP83822: enable rgmii mode if phy_interface_is_rgmii
    https://git.kernel.org/netdev/net-next/c/621427fbdada

You are awesome, thank you!
-- 
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