From d0d37833d37e5f749eeffedadfa9662b6ed2d80a Mon Sep 17 00:00:00 2001 From: Marek Szyprowski Date: Tue, 19 Mar 2019 13:58:06 +0100 Subject: [PATCH] ARM: dts: exynos: Increase minimal ACLK400_DISP1 frequency on Exynos542x ACLK400_DISP1 bus feeds some internal buses of the display subsystem, some of which are also related to TV/Mixer hardware modules. When that bus is set to 120MHz, Exynos Mixer is not able to properly handle two XRGB display planes at FullHD-60MHz. DMA underrun happens, which in turn might result in reading data out of the configured buffer, what causes IOMMU page fault and kernel panic. This change fixes the following IOMMU fault, observed, when 2 Mixer planes were enabled: exynos-sysmmu 14650000.sysmmu: 14450000.mixer: PAGE FAULT occurred at 0x20fe9000 ------------[ cut here ]------------ kernel BUG at ../drivers/iommu/exynos-iommu.c:450! Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM Modules linked in: CPU: 5 PID: 0 Comm: swapper/5 Not tainted 5.0.0-00003-g1b03088168ea #149 Hardware name: SAMSUNG EXYNOS (Flattened Device Tree) PC is at exynos_sysmmu_irq+0x1c0/0x264 LR is at lock_is_held_type+0x44/0x64 ... Reported-by: Marian Mihailescu Fixes: 5d99cc59a3c6 ("ARM: dts: exynos: Move Exynos5250 and Exynos5420 nodes under soc") Fixes: b04a62d3ade3 ("ARM: dts: exynos: Add bus nodes using VDD_INT for Exynos542x SoC") Signed-off-by: Marek Szyprowski Change-Id: I3d2f341f5e89d4631401f653d0ad9e36f26f45ad --- arch/arm/boot/dts/exynos5420.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/arm/boot/dts/exynos5420.dtsi b/arch/arm/boot/dts/exynos5420.dtsi index 5451c13fbbf9..d490d22ff82d 100644 --- a/arch/arm/boot/dts/exynos5420.dtsi +++ b/arch/arm/boot/dts/exynos5420.dtsi @@ -1300,7 +1300,7 @@ compatible = "operating-points-v2"; opp00 { - opp-hz = /bits/ 64 <120000000>; + opp-hz = /bits/ 64 <150000000>; }; opp01 { opp-hz = /bits/ 64 <200000000>; -- 2.34.1