[PATCH 07/13] tegra: pmc: work around power domain failure

[Lucas Stach]

Sometimes a power domain didn't properly power up,
reading back the command register seems to fix this
by flushing the write.

Signed-off-by: Lucas Stach <dev at lynxeye.de>
---
 arch/arm/mach-tegra/tegra20-pmc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/arm/mach-tegra/tegra20-pmc.c b/arch/arm/mach-tegra/tegra20-pmc.c
index d9f76e2..eaa5ac7 100644
--- a/arch/arm/mach-tegra/tegra20-pmc.c
+++ b/arch/arm/mach-tegra/tegra20-pmc.c
@@ -55,6 +55,8 @@ static int tegra_powergate_set(int id, bool new_state)
 	}
 
 	writel(PMC_PWRGATE_TOGGLE_START | id, pmc_base + PMC_PWRGATE_TOGGLE);
+	/* I don't know exactly why this is needed, seems to flush the write */
+	readl(pmc_base + PMC_PWRGATE_TOGGLE);
 
 	return 0;
 }
-- 
1.9.3