| Message ID | 20240930095745.3007057-1-s-vadapalli@ti.com |
|---|---|
| State | New |
| Headers | show |
| Series | [v2] phy: ti: phy-j721e-wiz: fix usxgmii configuration | expand |
Hi Siddharth, On 30/09/2024 12:57, Siddharth Vadapalli wrote: > Commit b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in > wiz driver") added support for USXGMII mode. In doing so, P0_REFCLK_SEL > was set to "pcs_mac_clk_divx1_ln_0" (0x3) and P0_STANDARD_MODE was set to > LANE_MODE_GEN1, which results in a data rate of 5.15625 Gbps. However, > since the USXGMII mode can support up to 10.3125 Gbps data rate, the > aforementioned fields should be set to "pcs_mac_clk_divx0_ln_0" (0x2) and > LANE_MODE_GEN2 respectively. Fix the configuration accordingly to truly > support USXGMII up to 10G. > > Fixes: b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in wiz driver") > Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> > --- > > Hello, > > This patch is based on commit > 9852d85ec9d4 Linux 6.12-rc1 > of mainline Linux. > > v1: > https://lore.kernel.org/r/20240910091714.1082191-1-s-vadapalli@ti.com/ > Changes since v1: > - Rebased to Linux 6.12-rc1. > > Regards, > Siddharth. > > drivers/phy/ti/phy-j721e-wiz.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c > index a6c0c5607ffd..c6e846d385d2 100644 > --- a/drivers/phy/ti/phy-j721e-wiz.c > +++ b/drivers/phy/ti/phy-j721e-wiz.c > @@ -450,8 +450,8 @@ static int wiz_mode_select(struct wiz *wiz) > } else if (wiz->lane_phy_type[i] == PHY_TYPE_USXGMII) { > ret = regmap_field_write(wiz->p0_mac_src_sel[i], 0x3); > ret = regmap_field_write(wiz->p0_rxfclk_sel[i], 0x3); I'm not sure. Don't we have to change rxfclk as well? > - ret = regmap_field_write(wiz->p0_refclk_sel[i], 0x3); > - mode = LANE_MODE_GEN1; > + ret = regmap_field_write(wiz->p0_refclk_sel[i], 0x2); > + mode = LANE_MODE_GEN2; > } else { > continue; > }
On Mon, Sep 30, 2024 at 05:06:35PM +0300, Roger Quadros wrote: Hello Roger, > Hi Siddharth, > > On 30/09/2024 12:57, Siddharth Vadapalli wrote: > > Commit b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in > > wiz driver") added support for USXGMII mode. In doing so, P0_REFCLK_SEL > > was set to "pcs_mac_clk_divx1_ln_0" (0x3) and P0_STANDARD_MODE was set to > > LANE_MODE_GEN1, which results in a data rate of 5.15625 Gbps. However, > > since the USXGMII mode can support up to 10.3125 Gbps data rate, the > > aforementioned fields should be set to "pcs_mac_clk_divx0_ln_0" (0x2) and > > LANE_MODE_GEN2 respectively. Fix the configuration accordingly to truly > > support USXGMII up to 10G. > > > > Fixes: b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in wiz driver") > > Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> [...] > > diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c > > index a6c0c5607ffd..c6e846d385d2 100644 > > --- a/drivers/phy/ti/phy-j721e-wiz.c > > +++ b/drivers/phy/ti/phy-j721e-wiz.c > > @@ -450,8 +450,8 @@ static int wiz_mode_select(struct wiz *wiz) > > } else if (wiz->lane_phy_type[i] == PHY_TYPE_USXGMII) { > > ret = regmap_field_write(wiz->p0_mac_src_sel[i], 0x3); > > ret = regmap_field_write(wiz->p0_rxfclk_sel[i], 0x3); > > I'm not sure. Don't we have to change rxfclk as well? This patch was validated on a custom board with the J7200 SR 2.0 SoC. The signal corresponding to the USXGMII lane of the SERDES was measured to be 5 Gbps without this patch and 10 Gbps with this patch applied, with no other changes required. Apart from measuring the signal, ping was also validated. Regards, Siddharth.
On 01/10/2024 06:10, Siddharth Vadapalli wrote: > On Mon, Sep 30, 2024 at 05:06:35PM +0300, Roger Quadros wrote: > > Hello Roger, > >> Hi Siddharth, >> >> On 30/09/2024 12:57, Siddharth Vadapalli wrote: >>> Commit b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in >>> wiz driver") added support for USXGMII mode. In doing so, P0_REFCLK_SEL >>> was set to "pcs_mac_clk_divx1_ln_0" (0x3) and P0_STANDARD_MODE was set to >>> LANE_MODE_GEN1, which results in a data rate of 5.15625 Gbps. However, >>> since the USXGMII mode can support up to 10.3125 Gbps data rate, the >>> aforementioned fields should be set to "pcs_mac_clk_divx0_ln_0" (0x2) and >>> LANE_MODE_GEN2 respectively. Fix the configuration accordingly to truly >>> support USXGMII up to 10G. >>> >>> Fixes: b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in wiz driver") >>> Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> > > [...] > >>> diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c >>> index a6c0c5607ffd..c6e846d385d2 100644 >>> --- a/drivers/phy/ti/phy-j721e-wiz.c >>> +++ b/drivers/phy/ti/phy-j721e-wiz.c >>> @@ -450,8 +450,8 @@ static int wiz_mode_select(struct wiz *wiz) >>> } else if (wiz->lane_phy_type[i] == PHY_TYPE_USXGMII) { >>> ret = regmap_field_write(wiz->p0_mac_src_sel[i], 0x3); >>> ret = regmap_field_write(wiz->p0_rxfclk_sel[i], 0x3); >> >> I'm not sure. Don't we have to change rxfclk as well? > > This patch was validated on a custom board with the J7200 SR 2.0 SoC. > The signal corresponding to the USXGMII lane of the SERDES was measured > to be 5 Gbps without this patch and 10 Gbps with this patch applied, > with no other changes required. Apart from measuring the signal, ping > was also validated. Thanks. This is useful piece off information that could go in the commit log. Reviewed-by: Roger Quadros <rogerq@kernel.org>
diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c index a6c0c5607ffd..c6e846d385d2 100644 --- a/drivers/phy/ti/phy-j721e-wiz.c +++ b/drivers/phy/ti/phy-j721e-wiz.c @@ -450,8 +450,8 @@ static int wiz_mode_select(struct wiz *wiz) } else if (wiz->lane_phy_type[i] == PHY_TYPE_USXGMII) { ret = regmap_field_write(wiz->p0_mac_src_sel[i], 0x3); ret = regmap_field_write(wiz->p0_rxfclk_sel[i], 0x3); - ret = regmap_field_write(wiz->p0_refclk_sel[i], 0x3); - mode = LANE_MODE_GEN1; + ret = regmap_field_write(wiz->p0_refclk_sel[i], 0x2); + mode = LANE_MODE_GEN2; } else { continue; }
Commit b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in wiz driver") added support for USXGMII mode. In doing so, P0_REFCLK_SEL was set to "pcs_mac_clk_divx1_ln_0" (0x3) and P0_STANDARD_MODE was set to LANE_MODE_GEN1, which results in a data rate of 5.15625 Gbps. However, since the USXGMII mode can support up to 10.3125 Gbps data rate, the aforementioned fields should be set to "pcs_mac_clk_divx0_ln_0" (0x2) and LANE_MODE_GEN2 respectively. Fix the configuration accordingly to truly support USXGMII up to 10G. Fixes: b64a85fb8f53 ("phy: ti: phy-j721e-wiz.c: Add usxgmii support in wiz driver") Signed-off-by: Siddharth Vadapalli <s-vadapalli@ti.com> --- Hello, This patch is based on commit 9852d85ec9d4 Linux 6.12-rc1 of mainline Linux. v1: https://lore.kernel.org/r/20240910091714.1082191-1-s-vadapalli@ti.com/ Changes since v1: - Rebased to Linux 6.12-rc1. Regards, Siddharth. drivers/phy/ti/phy-j721e-wiz.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)