On 03/12/2018 06:25 AM, Chunfeng Yun wrote:
> There are two parameters, ref_clk and coefficient, for U2 slew rate
> calibrate which may vary on different SoCs, here allow them to be
> configurable
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@xxxxxxxxxxxx>
Reviewed-by: Matthias Brugger <matthias.bgg@xxxxxxxxx>
> ---
> drivers/phy/mediatek/phy-mtk-tphy.c | 20 +++++++++++++++-----
> 1 file changed, 15 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/phy/mediatek/phy-mtk-tphy.c b/drivers/phy/mediatek/phy-mtk-tphy.c
> index 6073c25..38c281b 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;
>
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