[PATCH 4/5] rockchip: rk3568: enable automatic power savings

[Chris Morgan <macroalpha82@gmail.com>]

From: Chris Morgan <macromorgan@hotmail.com>

This is adapted from Peter Geis's work located here:
https://gitlab.com/pgwipeout/u-boot-quartz64/-/commit/ec20b790adc41bb400e2c523cb35ffee14e223f4

It enables automatic clock gating on idle, disables the eDP phy by
default, and sets the core pvtpll ring length. It is reported this
lowers the temperature on at least one SoC by 7C.

Signed-off-by: Chris Morgan <macromorgan@hotmail.com>
---
 arch/arm/mach-rockchip/rk3568/rk3568.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/arch/arm/mach-rockchip/rk3568/rk3568.c b/arch/arm/mach-rockchip/rk3568/rk3568.c
index a2d59abc26..4a08820a09 100644
--- a/arch/arm/mach-rockchip/rk3568/rk3568.c
+++ b/arch/arm/mach-rockchip/rk3568/rk3568.c
@@ -24,6 +24,16 @@
 #define SGRF_SOC_CON4			0x10
 #define EMMC_HPROT_SECURE_CTRL		0x03
 #define SDMMC0_HPROT_SECURE_CTRL	0x01
+
+#define PMU_BASE_ADDR		0xfdd90000
+#define PMU_NOC_AUTO_CON0	(0x70)
+#define PMU_NOC_AUTO_CON1	(0x74)
+#define EDP_PHY_GRF_BASE	0xfdcb0000
+#define EDP_PHY_GRF_CON0	(EDP_PHY_GRF_BASE + 0x00)
+#define EDP_PHY_GRF_CON10	(EDP_PHY_GRF_BASE + 0x28)
+#define CPU_GRF_BASE		0xfdc30000
+#define GRF_CORE_PVTPLL_CON0	(0x10)
+
 /* PMU_GRF_GPIO0D_IOMUX_L */
 enum {
 	GPIO0D1_SHIFT		= 4,
@@ -98,6 +108,20 @@ void board_debug_uart_init(void)
 int arch_cpu_init(void)
 {
 #ifdef CONFIG_SPL_BUILD
+	/*
+	 * When perform idle operation, corresponding clock can
+	 * be opened or gated automatically.
+	 */
+	writel(0xffffffff, PMU_BASE_ADDR + PMU_NOC_AUTO_CON0);
+	writel(0x000f000f, PMU_BASE_ADDR + PMU_NOC_AUTO_CON1);
+
+	/* Disable eDP phy by default */
+	writel(0x00070007, EDP_PHY_GRF_CON10);
+	writel(0x0ff10ff1, EDP_PHY_GRF_CON0);
+
+	/* Set core pvtpll ring length */
+	writel(0x00ff002b, CPU_GRF_BASE + GRF_CORE_PVTPLL_CON0);
+
 	/* Set the emmc sdmmc0 to secure */
 	rk_clrreg(SGRF_BASE + SGRF_SOC_CON4, (EMMC_HPROT_SECURE_CTRL << 11
 		| SDMMC0_HPROT_SECURE_CTRL << 4));
-- 
2.34.1