diff options
Diffstat (limited to 'drivers/phy')
| -rw-r--r-- | drivers/phy/mediatek/phy-mtk-tphy.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c index 6073c25eb3f2..38c281b5abbb 100644 --- a/drivers/phy/mediatek/phy-mtk-tphy.c +++ b/drivers/phy/mediatek/phy-mtk-tphy.c @@ -306,6 +306,8 @@ struct mtk_tphy { const struct mtk_phy_pdata *pdata; struct mtk_phy_instance **phys; int nphys; + int src_ref_clk; /* MHZ, reference clock for slew rate calibrate */ + int src_coef; /* coefficient for slew rate calibrate */ }; static void hs_slew_rate_calibrate(struct mtk_tphy *tphy, @@ -360,16 +362,17 @@ static void hs_slew_rate_calibrate(struct mtk_tphy *tphy, writel(tmp, fmreg + U3P_U2FREQ_FMMONR1); if (fm_out) { - /* ( 1024 / FM_OUT ) x reference clock frequency x 0.028 */ - tmp = U3P_FM_DET_CYCLE_CNT * U3P_REF_CLK * U3P_SLEW_RATE_COEF; - tmp /= fm_out; + /* ( 1024 / FM_OUT ) x reference clock frequency x coef */ + tmp = tphy->src_ref_clk * tphy->src_coef; + tmp = (tmp * U3P_FM_DET_CYCLE_CNT) / fm_out; calibration_val = DIV_ROUND_CLOSEST(tmp, U3P_SR_COEF_DIVISOR); } else { /* if FM detection fail, set default value */ calibration_val = 4; } - dev_dbg(tphy->dev, "phy:%d, fm_out:%d, calib:%d\n", - instance->index, fm_out, calibration_val); + dev_dbg(tphy->dev, "phy:%d, fm_out:%d, calib:%d (clk:%d, coef:%d)\n", + instance->index, fm_out, calibration_val, + tphy->src_ref_clk, tphy->src_coef); /* set HS slew rate */ tmp = readl(com + U3P_USBPHYACR5); @@ -1041,6 +1044,13 @@ static int mtk_tphy_probe(struct platform_device *pdev) tphy->u3phya_ref = NULL; } + tphy->src_ref_clk = U3P_REF_CLK; + tphy->src_coef = U3P_SLEW_RATE_COEF; + /* update parameters of slew rate calibrate if exist */ + device_property_read_u32(dev, "mediatek,src-ref-clk-mhz", + &tphy->src_ref_clk); + device_property_read_u32(dev, "mediatek,src-coef", &tphy->src_coef); + port = 0; for_each_child_of_node(np, child_np) { struct mtk_phy_instance *instance; |