On Thu, Apr 11, 2019 at 10:40:27AM +0200, Simon Horman wrote:
> On Wed, Apr 10, 2019 at 08:17:16PM +0300, Sergei Shtylyov wrote:
> > On 04/10/2019 07:19 PM, Andrew Lunn wrote:
> >
> > >> According to the R-Car Gen3 Hardware Manual Rev 1.50 of Nov 30, 2018, the
> > >> TX clock internal delay mode isn't supported on R-Car E3 (r8a77990) or D3
> > >> (r8a77995). And by extension it is also not supported by RZ/G2E (r9a774c0).
> > >>
> > >> This matches all ES versions of the affected SoCs as it is
> > >> not clear if this problem will be resolved in newer chips.
> > >> This can be revisited, as necessary.
> > >>
> > >> This patch does not error-out if PHY_INTERFACE_MODE_RGMII_ID or
> > >> PHY_INTERFACE_MODE_RGMII_TXID are used on SoCs where TX clock delay
> > >> mode is not supported as there is a risk of introducing a regression
> > >> when used in conjunction with older DT blobs present in the field.
> > >
> > > Hi Simon
> > >
> > > I think it should at least WARN_ON(). Such blobs are broken, even if
> > > they do kind of work.
> >
> > Good idea! Simon, third time's a charm? :-)
>
> Sure, can do.
How about something like this?
--- a/drivers/net/ethernet/renesas/ravb_main.c
+++ b/drivers/net/ethernet/renesas/ravb_main.c
@@ -1980,8 +1987,14 @@ static void ravb_set_delay_mode(struct net_device *ndev)
set |= APSR_DM_RDM;
if (priv->phy_interface == PHY_INTERFACE_MODE_RGMII_ID ||
- priv->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID)
- set |= APSR_DM_TDM;
+ priv->phy_interface == PHY_INTERFACE_MODE_RGMII_TXID) {
+ if (soc_device_match(ravb_delay_mode_quirk_match))
+ dev_warn(ndev->dev.parent,
+ "phy-mode %s requires TX clock internal delay mode which is not supported by this hardwre revision",
+ phy_modes(priv->phy_interface));
+ else
+ set |= APSR_DM_TDM;
+ }
ravb_modify(ndev, APSR, APSR_DM, set);
}
