[U-Boot] [PATCH 12/15] i.MX7ULP: Workaround APLL PFD2 to 345.6Mhz

[Peng Fan]

From: Ye Li <ye.li at nxp.com>

The GPU uses APLL PFD2 as its clock parent (483.84Mhz) with divider
set to 1. This frequecy is out of ULP A0 spec. The MAX rate for GPU
is 350Mhz. So we simply configure the APLL PFD2 to 345.6Mhz (FRAC=28)
to workaround the problem. The correct fix should let GPU handle the
clock rate in kernel.

Signed-off-by: Ye Li <ye.li at nxp.com>
Signed-off-by: Peng Fan <peng.fan at nxp.com>
---
 arch/arm/mach-imx/mx7ulp/clock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/mach-imx/mx7ulp/clock.c b/arch/arm/mach-imx/mx7ulp/clock.c
index 0a0165cad2..6d6697ad99 100644
--- a/arch/arm/mach-imx/mx7ulp/clock.c
+++ b/arch/arm/mach-imx/mx7ulp/clock.c
@@ -300,9 +300,9 @@ void clock_init(void)
 
 	scg_a7_soscdiv_init();
 
-	/* APLL PFD1 = 270Mhz, PFD2=480Mhz, PFD3=800Mhz */
+	/* APLL PFD1 = 270Mhz, PFD2=345.6Mhz, PFD3=800Mhz */
 	scg_enable_pll_pfd(SCG_APLL_PFD1_CLK, 35);
-	scg_enable_pll_pfd(SCG_APLL_PFD2_CLK, 20);
+	scg_enable_pll_pfd(SCG_APLL_PFD2_CLK, 28);
 	scg_enable_pll_pfd(SCG_APLL_PFD3_CLK, 12);
 
 	init_clk_lpuart();
-- 
2.16.4