[PATCH v4 05/13] video: tegra20: dc: add PLLD2 parent support

[Svyatoslav Ryhel]

T30+ SOC have second PLLD - PLLD2 which can be actively used by
DC and act as main DISP1/2 clock parent.

Tested-by: Agneli <poczt at protonmail.ch> # Toshiba AC100 T20
Tested-by: Robert Eckelmann <longnoserob at gmail.com> # ASUS TF101
Tested-by: Andreas Westman Dorcsak <hedmoo at yahoo.com> # ASUS Grouper E1565
Tested-by: Ion Agorria <ion at agorria.com> # HTC One X
Tested-by: Svyatoslav Ryhel <clamor95 at gmail.com> # Nvidia Tegratab T114
Signed-off-by: Svyatoslav Ryhel <clamor95 at gmail.com>
---
 drivers/video/tegra20/tegra-dc.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/video/tegra20/tegra-dc.c b/drivers/video/tegra20/tegra-dc.c
index 0e94e665ef..56a23b3c97 100644
--- a/drivers/video/tegra20/tegra-dc.c
+++ b/drivers/video/tegra20/tegra-dc.c
@@ -304,6 +304,12 @@ static int tegra_display_probe(struct tegra_lcd_priv *priv,
 	if (priv->dc_clk[1] == CLOCK_ID_DISPLAY)
 		rate /= 2;
 
+#ifndef CONFIG_TEGRA20
+	/* PLLD2 obeys same rules as PLLD but it is present only on T30+ */
+	if (priv->dc_clk[1] == CLOCK_ID_DISPLAY2)
+		rate /= 2;
+#endif
+
 	/*
 	 * HOST1X is init by default at 150MHz with PLLC as parent
 	 */
-- 
2.40.1