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Date: Fri, 1 Apr 2022 21:41:58 -0700 From: Jakub Kicinski <kuba@...nel.org> To: Chen-Yu Tsai <wens@...nel.org> Cc: Giuseppe Cavallaro <peppe.cavallaro@...com>, Alexandre Torgue <alexandre.torgue@...s.st.com>, Jose Abreu <joabreu@...opsys.com>, "David S. Miller" <davem@...emloft.net>, Paolo Abeni <pabeni@...hat.com>, Chen-Yu Tsai <wens@...e.org>, Srinivas Kandagatla <srinivas.kandagatla@...aro.org>, netdev@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Russell King <rmk+kernel@...linux.org.uk> Subject: Re: [PATCH RESEND2] net: stmmac: Fix unset max_speed difference between DT and non-DT platforms On Fri, 1 Apr 2022 02:48:32 +0800 Chen-Yu Tsai wrote: > From: Chen-Yu Tsai <wens@...e.org> > > In commit 9cbadf094d9d ("net: stmmac: support max-speed device tree > property"), when DT platforms don't set "max-speed", max_speed is set to > -1; for non-DT platforms, it stays the default 0. > > Prior to commit eeef2f6b9f6e ("net: stmmac: Start adding phylink support"), > the check for a valid max_speed setting was to check if it was greater > than zero. This commit got it right, but subsequent patches just checked > for non-zero, which is incorrect for DT platforms. > > In commit 92c3807b9ac3 ("net: stmmac: convert to phylink_get_linkmodes()") > the conversion switched completely to checking for non-zero value as a > valid value, which caused 1000base-T to stop getting advertised by > default. > > Instead of trying to fix all the checks, simply leave max_speed alone if > DT property parsing fails. > > Fixes: 9cbadf094d9d ("net: stmmac: support max-speed device tree property") > Fixes: 92c3807b9ac3 ("net: stmmac: convert to phylink_get_linkmodes()") > Signed-off-by: Chen-Yu Tsai <wens@...e.org> > Acked-by: Russell King (Oracle) <rmk+kernel@...linux.org.uk> > --- > > Resend2: CC Srinivas at Linaro instead of ST. Collected Russell's ack. > Resend: added Srinivas (author of first fixed commit) to CC list. > > This was first noticed on ROC-RK3399-PC, and also observed on ROC-RK3328-CC. > The fix was tested on ROC-RK3328-CC and Libre Computer ALL-H5-ALL-CC. This patch got marked Changes Requested in pw, but I can't see why, so I went on a limb and applied it. LMK if that was a mistake, otherwise its commit c21cabb0fd0b ("net: stmmac: Fix unset max_speed difference between DT and non-DT platforms") in net.
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