[REGRESSION, BISECTED] mvneta broken in 3.14 on RN2120, RN102 and RN104 after e3a8786c10e7

Hi Thomas,

Thomas Petazzoni [off-list ref] writes:

quoted

I built a first kernel with the 'else' branch above removed (rationale:
SERDES config was not set for RGMII prior to the patch). The issue
remained.
     
    -       mvneta_gmac_rgmii_set(pp, 1);
    +       val = mvreg_read(pp, MVNETA_GMAC_CTRL_2);
    +
    +       val |= MVNETA_GMAC2_PCS_ENABLE | MVNETA_GMAC2_PORT_RGMII;

I removed MVNETA_GMAC2_PCS_ENABLE flag setting (rationale: it was only
done for SGMII prior to the patch and all my platforms have RGMII
connected PHY). *The issue disappeared on all 3 NAS with that simple
change*.

Yes, issue known. See https://bugzilla.kernel.org/show_bug.cgi?id=73401.

Unfortunately, at this point I don't have enough informations to fix
both issues: the issue you're having, and the issue of using mvneta as
a module. Since the issue you're having is much more problematic, I'll
send a patch to revert my patch, until I have enough informations to
fix the problem in a proper way.

Thanks for your report!

Thanks for your work and the fast feedback. Do not hesitate to bug me if
you want me to do some tests at some point.

Cheers,

a+