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| author | Lucas Stach <dev@lynxeye.de> | 2014-11-02 21:13:49 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-11-03 09:38:37 +0100 |
| commit | 7cf0a3ea2bb07bd02dfe22a81d34c8614e72f52c (patch) | |
| tree | 4db2c1e82b642aa21396a6932423f36f387770e4 /arch/arm/mach-tegra | |
| parent | 7d60a02034bb8816c74d2bbddc0d0981024bed66 (diff) | |
| download | barebox-7cf0a3ea2bb07bd02dfe22a81d34c8614e72f52c.tar.gz barebox-7cf0a3ea2bb07bd02dfe22a81d34c8614e72f52c.tar.xz | |
tegra: pmc: work around power domain failure
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@lynxeye.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'arch/arm/mach-tegra')
| -rw-r--r-- | arch/arm/mach-tegra/tegra20-pmc.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mach-tegra/tegra20-pmc.c b/arch/arm/mach-tegra/tegra20-pmc.c index 4cd01ffc29..dcd2978109 100644 --- a/arch/arm/mach-tegra/tegra20-pmc.c +++ b/arch/arm/mach-tegra/tegra20-pmc.c @@ -53,6 +53,8 @@ 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; } |