openwrtv4/package/boot/uboot-sunxi/patches/012-sun6i-fix-clock_twi_onoff.patch

From 730d2f3a41c5ccae71b5008fffdf697d143be68c Mon Sep 17 00:00:00 2001
From: Hans de Goede <hdegoede@redhat.com>
Date: Wed, 16 Mar 2016 20:44:51 +0100
Subject: [PATCH] sunxi: Fix clock_twi_onoff for sun6i

The clock_sun6i.c implementation was not deasserting the reset for
the regular i2c controllers, this commit fixes this.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
---
 arch/arm/cpu/armv7/sunxi/clock_sun6i.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
index 700b605..4e1e1a4 100644
--- a/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
+++ b/arch/arm/cpu/armv7/sunxi/clock_sun6i.c
@@ -100,13 +100,18 @@ int clock_twi_onoff(int port, int state)
 		return 0;
 	}
 
-	/* set the apb clock gate for twi */
-	if (state)
+	/* set the apb clock gate and reset for twi */
+	if (state) {
 		setbits_le32(&ccm->apb2_gate,
 			     CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
-	else
+		setbits_le32(&ccm->apb2_reset_cfg,
+			     1 << (APB2_RESET_TWI_SHIFT + port));
+	} else {
+		clrbits_le32(&ccm->apb2_reset_cfg,
+			     1 << (APB2_RESET_TWI_SHIFT + port));
 		clrbits_le32(&ccm->apb2_gate,
 			     CLK_GATE_OPEN << (APB2_GATE_TWI_SHIFT+port));
+	}
 
 	return 0;
 }