diff options
Diffstat (limited to 'target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch')
| -rw-r--r-- | target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch | 84 |
1 files changed, 84 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch b/target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch new file mode 100644 index 0000000000..d48d797294 --- /dev/null +++ b/target/linux/generic/backport-5.4/780-net-dsa-mt7530-setup-core-clock-even-in-TRGMII-mode.patch @@ -0,0 +1,84 @@ +From c3b8e07909dbe67b0d580416c1a5257643a73be7 Mon Sep 17 00:00:00 2001 +From: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> +Date: Fri, 12 Mar 2021 00:07:03 -0800 +Subject: [PATCH] net: dsa: mt7530: setup core clock even in TRGMII mode + +A recent change to MIPS ralink reset logic made it so mt7530 actually +resets the switch on platforms such as mt7621 (where bit 2 is the reset +line for the switch). That exposed an issue where the switch would not +function properly in TRGMII mode after a reset. + +Reconfigure core clock in TRGMII mode to fix the issue. + +Tested on Ubiquiti ER-X (MT7621) with TRGMII mode enabled. + +Fixes: 3f9ef7785a9c ("MIPS: ralink: manage low reset lines") +Signed-off-by: Ilya Lipnitskiy <ilya.lipnitskiy@gmail.com> +Signed-off-by: David S. Miller <davem@davemloft.net> +--- + drivers/net/dsa/mt7530.c | 52 +++++++++++++++++++--------------------- + 1 file changed, 25 insertions(+), 27 deletions(-) + +--- a/drivers/net/dsa/mt7530.c ++++ b/drivers/net/dsa/mt7530.c +@@ -427,34 +427,32 @@ mt7530_pad_clk_setup(struct dsa_switch * + TD_DM_DRVP(8) | TD_DM_DRVN(8)); + + /* Setup core clock for MT7530 */ +- if (!trgint) { +- /* Disable MT7530 core clock */ +- core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN); +- +- /* Disable PLL, since phy_device has not yet been created +- * provided for phy_[read,write]_mmd_indirect is called, we +- * provide our own core_write_mmd_indirect to complete this +- * function. +- */ +- core_write_mmd_indirect(priv, +- CORE_GSWPLL_GRP1, +- MDIO_MMD_VEND2, +- 0); +- +- /* Set core clock into 500Mhz */ +- core_write(priv, CORE_GSWPLL_GRP2, +- RG_GSWPLL_POSDIV_500M(1) | +- RG_GSWPLL_FBKDIV_500M(25)); +- +- /* Enable PLL */ +- core_write(priv, CORE_GSWPLL_GRP1, +- RG_GSWPLL_EN_PRE | +- RG_GSWPLL_POSDIV_200M(2) | +- RG_GSWPLL_FBKDIV_200M(32)); +- +- /* Enable MT7530 core clock */ +- core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN); +- } ++ /* Disable MT7530 core clock */ ++ core_clear(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN); ++ ++ /* Disable PLL, since phy_device has not yet been created ++ * provided for phy_[read,write]_mmd_indirect is called, we ++ * provide our own core_write_mmd_indirect to complete this ++ * function. ++ */ ++ core_write_mmd_indirect(priv, ++ CORE_GSWPLL_GRP1, ++ MDIO_MMD_VEND2, ++ 0); ++ ++ /* Set core clock into 500Mhz */ ++ core_write(priv, CORE_GSWPLL_GRP2, ++ RG_GSWPLL_POSDIV_500M(1) | ++ RG_GSWPLL_FBKDIV_500M(25)); ++ ++ /* Enable PLL */ ++ core_write(priv, CORE_GSWPLL_GRP1, ++ RG_GSWPLL_EN_PRE | ++ RG_GSWPLL_POSDIV_200M(2) | ++ RG_GSWPLL_FBKDIV_200M(32)); ++ ++ /* Enable MT7530 core clock */ ++ core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN); + + /* Setup the MT7530 TRGMII Tx Clock */ + core_set(priv, CORE_TRGMII_GSW_CLK_CG, REG_GSWCK_EN); |