soc/tegra: pmc: Remove unnecessary memory barrier

The removed barrier isn't needed because writes/reads are strictly ordered
and even if PMC had separate ports for writes, it wouldn't matter since
the hardware logic takes into effect after triggering CPU's power-gating
and at that point all CPU accesses are guaranteed to be completed. That
barrier was copied from the old arch/ code during transition to the soc/
PMC driver and even that the code structure was different back then, the
barrier didn't have a real useful purpose from the start. Lastly, the
tegra_pmc_writel() naturally inserts wmb() because it uses writel(),
and thus this change doesn't actually make any difference in terms of
interacting with hardware. Hence let's remove the barrier to clean up
code a tad.

Signed-off-by: Dmitry Osipenko <digetx@gmail.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>

diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
index 1f78e8497fde5e1e7c7508b6691f292baad58a41..8db63cfba833dfa657503271e34c35254c713f14 100644 (file)
--- a/drivers/soc/tegra/pmc.c
+++ b/drivers/soc/tegra/pmc.c
@@ -1478,8 +1478,6 @@ void tegra_pmc_enter_suspend_mode(enum tegra_suspend_mode mode)
        do_div(ticks, USEC_PER_SEC);
        tegra_pmc_writel(pmc, ticks, PMC_CPUPWROFF_TIMER);
 
-       wmb();
-
        value = tegra_pmc_readl(pmc, PMC_CNTRL);
        value &= ~PMC_CNTRL_SIDE_EFFECT_LP0;
        value |= PMC_CNTRL_CPU_PWRREQ_OE;