[PATCH] ARM: dts: omap4-droid4: Fix sgx clock rate

* [PATCH] ARM: dts: omap4-droid4: Fix sgx clock rate
@ 2020-03-10 20:18 Tony Lindgren
  2020-03-10 21:09 ` Tony Lindgren
  2020-03-11  4:35   ` kbuild test robot
  0 siblings, 2 replies; 5+ messages in thread
From: Tony Lindgren @ 2020-03-10 20:18 UTC (permalink / raw)
  To: linux-omap
  Cc: Benoît Cousson, devicetree, Arthur Demchenkov,
	Merlijn Wajer, Sebastian Reichel

We currently have a different clock rate for droid4 compared to the
stock v3.0.8 based Android Linux kernel:

# cat /sys/kernel/debug/clk/dpll_*_m7x2_ck/clk_rate
266666667
307200000
# cat /sys/kernel/debug/clk/l3_gfx_cm:clk:0000:0/clk_rate
307200000

Let's fix this by configuring sgx to use 153.6 MHz instead of 307.2 MHz.

This helps a bit with thermal issues that seem to be related to memory
corruption when using sgx. It seems that other driver related issues
still remain though.

Cc: Arthur Demchenkov <spinal.by@gmail.com>
Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/boot/dts/motorola-mapphone-common.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm/boot/dts/motorola-mapphone-common.dtsi b/arch/arm/boot/dts/motorola-mapphone-common.dtsi
--- a/arch/arm/boot/dts/motorola-mapphone-common.dtsi
+++ b/arch/arm/boot/dts/motorola-mapphone-common.dtsi
@@ -689,6 +689,16 @@ &rng_target {
 	status = "disabled";
 };
 
+/*
+ * Use dpll_per for sgx at 153.6MHz like the stock v3.0.8 Android kernel
+ */
+&sgx_module {
+	assigned-clocks = <&l3_gfx_clkctrl OMAP4_GPU_CLKCTRL 24>,
+			  <&dpll_per_m7x2_ck>;
+	assigned-clock-rates = <0>, <153600000>;
+	assigned-clock-parents = <&dpll_per_m7x2_ck>;
+};
+
 /* Configure pwm clock source for timers 8 & 9 */
 &timer8 {
 	assigned-clocks = <&abe_clkctrl OMAP4_TIMER8_CLKCTRL 24>;
-- 
2.25.1

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