From eae4e0f3c10967386382b848ef80d9f8852d67a1 Mon Sep 17 00:00:00 2001 From: Ye Li Date: Mon, 22 Jul 2019 01:25:03 +0000 Subject: [PATCH] i.MX7ULP: Workaround APLL PFD2 to 345.6Mhz 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 Signed-off-by: Peng Fan --- 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 e333c7815b..7012157078 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(); -- 2.39.5