clk: tegra: Disable spread spectrum on pll_d2

Enabling spread spectrum on pll_d2 can lead to issues with display
modes. HDMI monitors, for example, would report "Signal Error" and
some modes driven over DisplayPort would generate fuzzy horizontal
bands.

Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
index 6149573..c1fabd8 100644 (file)
--- a/drivers/clk/tegra/clk-tegra210.c
+++ b/drivers/clk/tegra/clk-tegra210.c
@@ -1935,8 +1935,9 @@ static struct tegra_clk_pll_params pll_d2_params = {
        .sdm_din_mask = PLLA_SDM_DIN_MASK,
        .sdm_ctrl_reg = PLLD2_MISC1,
        .sdm_ctrl_en_mask = PLLD2_SDM_EN_MASK,
-       .ssc_ctrl_reg = PLLD2_MISC1,
-       .ssc_ctrl_en_mask = PLLD2_SSC_EN_MASK,
+       /* disable spread-spectrum for pll_d2 */
+       .ssc_ctrl_reg = 0,
+       .ssc_ctrl_en_mask = 0,
        .round_p_to_pdiv = pll_qlin_p_to_pdiv,
        .pdiv_tohw = pll_qlin_pdiv_to_hw,
        .div_nmp = &pllss_nmp,