[PATCH 1/3] clk: tegra: Disable spread spectrum on pll_d2

Thierry Reding
2016-06-14T12:00:42Z

From: Thierry Reding <treding-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>

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-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>
---
drivers/clk/tegra/clk-tegra210.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/tegra/clk-tegra210.c b/drivers/clk/tegra/clk-tegra210.c
index 6bd1235d09b1..cd141a364c9d 100644
--- a/drivers/clk/tegra/clk-tegra210.c
+++ b/drivers/clk/tegra/clk-tegra210.c
@@ -1914,8 +1914,9 @@ 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,
--
2.8.3