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[3/9] ARM: uniphier: add work-around for VBO noise problem

Message ID 1475900731-10998-4-git-send-email-yamada.masahiro@socionext.com
State Accepted
Commit baaafaaad3d53706e3d02aa4e0bba75f535ebd18
Headers show

Commit Message

Masahiro Yamada Oct. 8, 2016, 4:25 a.m. UTC 
Raise the VDD09 voltage line to 1.0V to suppress VBO noise.
This errata work-around code is needed only for ES1.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>

---

 arch/arm/mach-uniphier/board_init.c | 7 +++++++
 1 file changed, 7 insertions(+)

-- 
1.9.1

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diff mbox

Patch

diff --git a/arch/arm/mach-uniphier/board_init.c b/arch/arm/mach-uniphier/board_init.c
index b9be52f..8c7864c 100644
--- a/arch/arm/mach-uniphier/board_init.c
+++ b/arch/arm/mach-uniphier/board_init.c
@@ -134,6 +134,13 @@  int board_init(void)
 #endif
 #if defined(CONFIG_ARCH_UNIPHIER_LD20)
 	case SOC_UNIPHIER_LD20:
+		/* ES1 errata: increase VDD09 supply to suppress VBO noise */
+		if (uniphier_get_soc_revision() == 1) {
+			writel(0x00000003, 0x6184e004);
+			writel(0x00000100, 0x6184e040);
+			writel(0x0000b500, 0x6184e024);
+			writel(0x00000001, 0x6184e000);
+		}
 		uniphier_nand_pin_init(false);
 		sg_set_pinsel(149, 14, 8, 4);	/* XIRQ0    -> XIRQ0 */
 		sg_set_iectrl(149);