Fix GPU on Linux when booting from warmboot

CTCaer · Feb 11, 2019 · 4f2bbbf · 4f2bbbf
1 parent b677d6c
commit 4f2bbbf
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diff --git a/bootloader/main.c b/bootloader/main.c
@@ -1157,6 +1157,7 @@ extern void pivot_stack(u32 stack_top);
 
 void ipl_main()
 {
+	// Do initial HW configuration. This is compatible with consecutive reruns without a reset.
 	config_hw();
 
 	//Pivot the stack so we have enough space.

diff --git a/bootloader/soc/hw_init.c b/bootloader/soc/hw_init.c
@@ -247,6 +247,10 @@ void reconfig_hw_workaround(bool extra_reconfig, u32 magic)
 		gpio_config(GPIO_PORT_D, GPIO_PIN_1, GPIO_MODE_SPIO);
 		gpio_config(GPIO_PORT_E, GPIO_PIN_6, GPIO_MODE_SPIO);
 		gpio_config(GPIO_PORT_H, GPIO_PIN_6, GPIO_MODE_SPIO);
+
+		// Fix GPU after warmboot for Linux.
+		i2c_send_byte(I2C_5, MAX77620_I2C_ADDR, MAX77620_REG_GPIO5, 2);
+		i2c_send_byte(I2C_5, MAX77620_I2C_ADDR, MAX77620_REG_GPIO6, 2);
 	}
 
 	// Power off display.