[U-Boot,u-boot] net: phy: meson-gxl: detect LPA corruption

[Tom Rini]

On Tue, Dec 12, 2017 at 04:03:55PM +0100, Neil Armstrong wrote:

> From: Jerome Brunet <jbrunet at baylibre.com>
> 
> This patch is ported from the Linux patch posted at [1] and applied to
> net tree as commit f1e2400a80ff.
> 
> The purpose of this change is to fix the incorrect detection of the link
> partner (LP) advertised capabilities which sometimes happens with this PHY
> (roughly 1 time in a dozen)
> 
> This issue may cause the link to be negotiated at 10Mbps/Full or
> 10Mbps/Half when 100MBps/Full is actually possible. In some case, the link
> is even completely broken and no communication is possible.
> 
> To detect the corruption, we must look for a magic undocumented bit in the
> WOL bank (hint given by the SoC vendor kernel) but this is not enough to
> cover all cases. We also have to look at the LPA ack. If the LP supports
> Aneg but did not ack our base code when aneg is completed, we assume
> something went wrong.
> 
> The detection of a corrupted LPA triggers a restart of the aneg process.
> This solves the problem but may take up to 6 retries to complete.
> 
> [1] https://lkml.kernel.org/r/20171208110811.30789-1-jbrunet@baylibre.com
> 
> Fixes: 8995a96d1d67 ("net: phy: Add Amlogic Meson GXL Internal PHY support")
> Signed-off-by: Jerome Brunet <jbrunet at baylibre.com>
> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>

Applied to u-boot/master, thanks!

-- 
Tom
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