| Message ID | 20240404-rk3588-pcie-bifurcation-fixes-v1-1-9907136eeafd@kernel.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | RK3588 PCIe bifurcation fixes | expand |
Am Donnerstag, 4. April 2024, 19:11:26 CEST schrieb Sebastian Reichel: > From: Michal Tomek <mtdev79b@gmail.com> > > So far all RK3588 boards use fully aggregated PCIe. CM3588 is one > of the few boards using this feature and apparently it is broken. > > The PHY offers the following mapping options: > > port 0 lane 0 - always mapped to controller 0 (4L) > port 0 lane 1 - to controller 0 or 2 (1L0) > port 1 lane 0 - to controller 0 or 1 (2L) > port 1 lane 1 - to controller 0, 1 or 3 (1L1) > > The data-lanes DT property maps these as follows: > > 0 = no controller (unsupported by the HW) > 1 = 4L > 2 = 2L > 3 = 1L0 > 4 = 1L1 > > That allows the following configurations with first column being the > mainline data-lane mapping, second column being the downstream name, > third column being PCIE3PHY_GRF_CMN_CON0 and PHP_GRF_PCIESEL register > values and final column being the user visible lane setup: > > <1 1 1 1> = AGGREG = [4 0] = x4 (aggregation) > <1 1 2 2> = NANBNB = [0 0] = x2 x2 (no bif.) > <1 3 2 2> = NANBBI = [1 1] = x2 x1x1 (bif. of port 0) > <1 1 2 4> = NABINB = [2 2] = x1x1 x2 (bif. of port 1) > <1 3 2 4> = NABIBI = [3 3] = x1x1 x1x1 (bif. of both ports) > > The driver currently does not program PHP_GRF_PCIESEL correctly, which > is fixed by this patch. As a side-effect the new logic is much simpler > than the old logic. > > Fixes: 2e9bffc4f713 ("phy: rockchip: Support PCIe v3") > Signed-off-by: Michal Tomek <mtdev79b@gmail.com> > Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com> > --- > drivers/phy/rockchip/phy-rockchip-snps-pcie3.c | 24 ++++++++---------------- > 1 file changed, 8 insertions(+), 16 deletions(-) > > diff --git a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c > index 121e5961ce11..d5bcc9c42b28 100644 > --- a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c > +++ b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c > @@ -132,7 +132,7 @@ static const struct rockchip_p3phy_ops rk3568_ops = { > static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv) > { > u32 reg = 0; > - u8 mode = 0; > + u8 mode = RK3588_LANE_AGGREGATION; /* default */ > int ret; > > /* Deassert PCIe PMA output clamp mode */ > @@ -140,28 +140,20 @@ static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv) > > /* Set bifurcation if needed */ > for (int i = 0; i < priv->num_lanes; i++) { > - if (!priv->lanes[i]) > - mode |= (BIT(i) << 3); > - > if (priv->lanes[i] > 1) > - mode |= (BIT(i) >> 1); > - } > - > - if (!mode) > - reg = RK3588_LANE_AGGREGATION; > - else { > - if (mode & (BIT(0) | BIT(1))) > - reg |= RK3588_BIFURCATION_LANE_0_1; > - > - if (mode & (BIT(2) | BIT(3))) > - reg |= RK3588_BIFURCATION_LANE_2_3; > + mode &= ~RK3588_LANE_AGGREGATION; > + if (priv->lanes[i] == 3) > + mode |= RK3588_BIFURCATION_LANE_0_1; > + if (priv->lanes[i] == 4) > + mode |= RK3588_BIFURCATION_LANE_2_3; > } > > + reg = mode; > regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0, (0x7<<16) | reg); nit: instead of doing reg=mode, why not use mode directly? i.e. (0x7<<16) | mode in the regmap_write call other than that Acked-by: Heiko Stuebner <heiko@sntech.de> > > /* Set pcie1ln_sel in PHP_GRF_PCIESEL_CON */ > if (!IS_ERR(priv->pipe_grf)) { > - reg = (mode & (BIT(6) | BIT(7))) >> 6; > + reg = mode & 3; > if (reg) > regmap_write(priv->pipe_grf, PHP_GRF_PCIESEL_CON, > (reg << 16) | reg); > >
diff --git a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c index 121e5961ce11..d5bcc9c42b28 100644 --- a/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c +++ b/drivers/phy/rockchip/phy-rockchip-snps-pcie3.c @@ -132,7 +132,7 @@ static const struct rockchip_p3phy_ops rk3568_ops = { static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv) { u32 reg = 0; - u8 mode = 0; + u8 mode = RK3588_LANE_AGGREGATION; /* default */ int ret; /* Deassert PCIe PMA output clamp mode */ @@ -140,28 +140,20 @@ static int rockchip_p3phy_rk3588_init(struct rockchip_p3phy_priv *priv) /* Set bifurcation if needed */ for (int i = 0; i < priv->num_lanes; i++) { - if (!priv->lanes[i]) - mode |= (BIT(i) << 3); - if (priv->lanes[i] > 1) - mode |= (BIT(i) >> 1); - } - - if (!mode) - reg = RK3588_LANE_AGGREGATION; - else { - if (mode & (BIT(0) | BIT(1))) - reg |= RK3588_BIFURCATION_LANE_0_1; - - if (mode & (BIT(2) | BIT(3))) - reg |= RK3588_BIFURCATION_LANE_2_3; + mode &= ~RK3588_LANE_AGGREGATION; + if (priv->lanes[i] == 3) + mode |= RK3588_BIFURCATION_LANE_0_1; + if (priv->lanes[i] == 4) + mode |= RK3588_BIFURCATION_LANE_2_3; } + reg = mode; regmap_write(priv->phy_grf, RK3588_PCIE3PHY_GRF_CMN_CON0, (0x7<<16) | reg); /* Set pcie1ln_sel in PHP_GRF_PCIESEL_CON */ if (!IS_ERR(priv->pipe_grf)) { - reg = (mode & (BIT(6) | BIT(7))) >> 6; + reg = mode & 3; if (reg) regmap_write(priv->pipe_grf, PHP_GRF_PCIESEL_CON, (reg << 16) | reg);