| Message ID | 20190218130352.9373-1-vkoul@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | net: dsa: qca8k: Enable delay for RGMII_ID mode | expand |
On Mon, Feb 18, 2019 at 06:33:51PM +0530, Vinod Koul wrote: > RGMII_ID specifies that we should have internal delay, so resurrect the > delay addition routine but under the RGMII_ID mode. > > Fixes: 40269aa9f40a ("net: dsa: qca8k: disable delay for RGMII mode") > Signed-off-by: Vinod Koul <vkoul@kernel.org> > --- > drivers/net/dsa/qca8k.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c > index a4b6cda38016..aa1f7f1b20d3 100644 > --- a/drivers/net/dsa/qca8k.c > +++ b/drivers/net/dsa/qca8k.c > @@ -443,6 +443,18 @@ qca8k_set_pad_ctrl(struct qca8k_priv *priv, int port, int mode) > val = QCA8K_PORT_PAD_RGMII_EN; > qca8k_write(priv, reg, val); > break; > + case PHY_INTERFACE_MODE_RGMII_ID: > + /* RGMII_ID needs internal delay. This is enabled through > + * PORT5_PAD_CTRL for all ports, rather than individual port > + * registers > + */ > + qca8k_write(priv, reg, > + QCA8K_PORT_PAD_RGMII_EN | > + QCA8K_PORT_PAD_RGMII_TX_DELAY(3) | > + QCA8K_PORT_PAD_RGMII_RX_DELAY(3)); > + qca8k_write(priv, QCA8K_REG_PORT5_PAD_CTRL, > + QCA8K_PORT_PAD_RGMII_RX_DELAY_EN); > + break; Hi Vinod So i'm still confused if this is global, or per-port. The first register written looks to be per-port, although only for ports 0 and 6. The second write seems to be global. Is there a danger that port 0 has PHY_INTERFACE_MODE_RGMII_ID and port 6 has PHY_INTERFACE_MODE_RGMII, and we end up with delays disabled? Maybe we should try to detect this, and return an error? > case PHY_INTERFACE_MODE_SGMII: > qca8k_write(priv, reg, QCA8K_PORT_PAD_SGMII_EN); > break; I think it would be good to add the other two PHY_INTERFACE_MODE_RGMII modes to the default clause so we get an error reported that they are not implemented. Andrew
On 18. 02. 19 14:03, Vinod Koul wrote: > RGMII_ID specifies that we should have internal delay, so resurrect the > delay addition routine but under the RGMII_ID mode. > > Fixes: 40269aa9f40a ("net: dsa: qca8k: disable delay for RGMII mode") > Signed-off-by: Vinod Koul <vkoul@kernel.org> Fixes the problem on my imx6dl platform with QCA8334 switch. Thank you! Tested-by: Michal Vokáč <michal.vokac@ysoft.com> > --- > drivers/net/dsa/qca8k.c | 12 ++++++++++++ > 1 file changed, 12 insertions(+) > > diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c > index a4b6cda38016..aa1f7f1b20d3 100644 > --- a/drivers/net/dsa/qca8k.c > +++ b/drivers/net/dsa/qca8k.c > @@ -443,6 +443,18 @@ qca8k_set_pad_ctrl(struct qca8k_priv *priv, int port, int mode) > val = QCA8K_PORT_PAD_RGMII_EN; > qca8k_write(priv, reg, val); > break; > + case PHY_INTERFACE_MODE_RGMII_ID: > + /* RGMII_ID needs internal delay. This is enabled through > + * PORT5_PAD_CTRL for all ports, rather than individual port > + * registers > + */ > + qca8k_write(priv, reg, > + QCA8K_PORT_PAD_RGMII_EN | > + QCA8K_PORT_PAD_RGMII_TX_DELAY(3) | > + QCA8K_PORT_PAD_RGMII_RX_DELAY(3)); > + qca8k_write(priv, QCA8K_REG_PORT5_PAD_CTRL, > + QCA8K_PORT_PAD_RGMII_RX_DELAY_EN); > + break; > case PHY_INTERFACE_MODE_SGMII: > qca8k_write(priv, reg, QCA8K_PORT_PAD_SGMII_EN); > break; >
On Mon, Feb 18, 2019 at 06:33:51PM +0530, Vinod Koul wrote: > + case PHY_INTERFACE_MODE_RGMII_ID: > + /* RGMII_ID needs internal delay. This is enabled through > + * PORT5_PAD_CTRL for all ports, rather than individual port > + * registers > + */ > + qca8k_write(priv, reg, > + QCA8K_PORT_PAD_RGMII_EN | > + QCA8K_PORT_PAD_RGMII_TX_DELAY(3) | > + QCA8K_PORT_PAD_RGMII_RX_DELAY(3)); Hi Vinod Could you add some #defines for the delay values? Thanks Andrew
Hi Andrew, On 18-02-19, 14:33, Andrew Lunn wrote: > On Mon, Feb 18, 2019 at 06:33:51PM +0530, Vinod Koul wrote: > > RGMII_ID specifies that we should have internal delay, so resurrect the > > delay addition routine but under the RGMII_ID mode. > > > > Fixes: 40269aa9f40a ("net: dsa: qca8k: disable delay for RGMII mode") > > Signed-off-by: Vinod Koul <vkoul@kernel.org> > > --- > > drivers/net/dsa/qca8k.c | 12 ++++++++++++ > > 1 file changed, 12 insertions(+) > > > > diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c > > index a4b6cda38016..aa1f7f1b20d3 100644 > > --- a/drivers/net/dsa/qca8k.c > > +++ b/drivers/net/dsa/qca8k.c > > @@ -443,6 +443,18 @@ qca8k_set_pad_ctrl(struct qca8k_priv *priv, int port, int mode) > > val = QCA8K_PORT_PAD_RGMII_EN; > > qca8k_write(priv, reg, val); > > break; > > + case PHY_INTERFACE_MODE_RGMII_ID: > > + /* RGMII_ID needs internal delay. This is enabled through > > + * PORT5_PAD_CTRL for all ports, rather than individual port > > + * registers > > + */ > > + qca8k_write(priv, reg, > > + QCA8K_PORT_PAD_RGMII_EN | > > + QCA8K_PORT_PAD_RGMII_TX_DELAY(3) | > > + QCA8K_PORT_PAD_RGMII_RX_DELAY(3)); > > + qca8k_write(priv, QCA8K_REG_PORT5_PAD_CTRL, > > + QCA8K_PORT_PAD_RGMII_RX_DELAY_EN); > > + break; > > Hi Vinod > > So i'm still confused if this is global, or per-port. The first > register written looks to be per-port, although only for ports 0 and > 6. The second write seems to be global. This is still a global write which enables the delay in all the ports (as was the case previously) > Is there a danger that port 0 has PHY_INTERFACE_MODE_RGMII_ID and port > 6 has PHY_INTERFACE_MODE_RGMII, and we end up with delays disabled? > Maybe we should try to detect this, and return an error? If that was the case, I would presume people would have reported an issue that it doesn't work for them..? > > case PHY_INTERFACE_MODE_SGMII: > > qca8k_write(priv, reg, QCA8K_PORT_PAD_SGMII_EN); > > break; > > I think it would be good to add the other two PHY_INTERFACE_MODE_RGMII > modes to the default clause so we get an error reported that they are > not implemented. That is still the case: default: pr_err("xMII mode %d not supported\n", mode); return -EINVAL;
On 18-02-19, 14:36, Andrew Lunn wrote: > On Mon, Feb 18, 2019 at 06:33:51PM +0530, Vinod Koul wrote: > > + case PHY_INTERFACE_MODE_RGMII_ID: > > + /* RGMII_ID needs internal delay. This is enabled through > > + * PORT5_PAD_CTRL for all ports, rather than individual port > > + * registers > > + */ > > + qca8k_write(priv, reg, > > + QCA8K_PORT_PAD_RGMII_EN | > > + QCA8K_PORT_PAD_RGMII_TX_DELAY(3) | > > + QCA8K_PORT_PAD_RGMII_RX_DELAY(3)); > > Hi Vinod > > Could you add some #defines for the delay values? Sure will update the patch
diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c index a4b6cda38016..aa1f7f1b20d3 100644 --- a/drivers/net/dsa/qca8k.c +++ b/drivers/net/dsa/qca8k.c @@ -443,6 +443,18 @@ qca8k_set_pad_ctrl(struct qca8k_priv *priv, int port, int mode) val = QCA8K_PORT_PAD_RGMII_EN; qca8k_write(priv, reg, val); break; + case PHY_INTERFACE_MODE_RGMII_ID: + /* RGMII_ID needs internal delay. This is enabled through + * PORT5_PAD_CTRL for all ports, rather than individual port + * registers + */ + qca8k_write(priv, reg, + QCA8K_PORT_PAD_RGMII_EN | + QCA8K_PORT_PAD_RGMII_TX_DELAY(3) | + QCA8K_PORT_PAD_RGMII_RX_DELAY(3)); + qca8k_write(priv, QCA8K_REG_PORT5_PAD_CTRL, + QCA8K_PORT_PAD_RGMII_RX_DELAY_EN); + break; case PHY_INTERFACE_MODE_SGMII: qca8k_write(priv, reg, QCA8K_PORT_PAD_SGMII_EN); break;
RGMII_ID specifies that we should have internal delay, so resurrect the delay addition routine but under the RGMII_ID mode. Fixes: 40269aa9f40a ("net: dsa: qca8k: disable delay for RGMII mode") Signed-off-by: Vinod Koul <vkoul@kernel.org> --- drivers/net/dsa/qca8k.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)