netdev - RE: [PATCH net v5 3/4] net: dsa: microchip: use collision based back pressure mode

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Message-ID: <BL0PR11MB2913E413DE94ABE68C475052E7F82@BL0PR11MB2913.namprd11.prod.outlook.com>
Date: Tue, 4 Jun 2024 20:50:45 +0000
From: <Woojung.Huh@...rochip.com>
To: <enguerrand.de-ribaucourt@...oirfairelinux.com>, <netdev@...r.kernel.org>
CC: <andrew@...n.ch>, <hkallweit1@...il.com>, <linux@...linux.org.uk>,
	<UNGLinuxDriver@...rochip.com>, <horms@...nel.org>,
	<Tristram.Ha@...rochip.com>, <Arun.Ramadoss@...rochip.com>
Subject: RE: [PATCH net v5 3/4] net: dsa: microchip: use collision based back
 pressure mode


> -----Original Message-----
> From: Enguerrand de Ribaucourt <enguerrand.de-
> ribaucourt@...oirfairelinux.com>
> Sent: Tuesday, June 4, 2024 5:23 AM
> To: netdev@...r.kernel.org
> Cc: andrew@...n.ch; hkallweit1@...il.com; linux@...linux.org.uk; Woojung Huh
> - C21699 <Woojung.Huh@...rochip.com>; UNGLinuxDriver
> <UNGLinuxDriver@...rochip.com>; horms@...nel.org; Tristram Ha - C24268
> <Tristram.Ha@...rochip.com>; Arun Ramadoss - I17769
> <Arun.Ramadoss@...rochip.com>; Enguerrand de Ribaucourt <enguerrand.de-
> ribaucourt@...oirfairelinux.com>
> Subject: [PATCH net v5 3/4] net: dsa: microchip: use collision based back
> pressure mode
> 
> EXTERNAL EMAIL: Do not click links or open attachments unless you know the
> content is safe
> 
> Errata DS80000758 states that carrier sense back pressure mode can cause
> link down issues in 100BASE-TX half duplex mode. The datasheet also
> recommends to always use the collision based back pressure mode.
> 
> Fixes: b987e98e50ab ("dsa: add DSA switch driver for Microchip KSZ9477")
> Signed-off-by: Enguerrand de Ribaucourt <enguerrand.de-
> ribaucourt@...oirfairelinux.com>
> ---
> v5:
>  - define SW_BACK_PRESSURE_COLLISION
> v4: https://lore.kernel.org/all/20240531142430.678198-5-enguerrand.de-
> ribaucourt@...oirfairelinux.com/
>  - rebase on net/main
>  - add Fixes tag
> v3: https://lore.kernel.org/all/20240530102436.226189-5-enguerrand.de-
> ribaucourt@...oirfairelinux.com/

Reviewed-by: Woojung Huh <Woojung.huh@...rochip.com>