Davinci: support LPSC SwRstDisable state
The current clock control code always gates the clock (PSC state Disable = 2)
on clk_disable(). Some on-chip peripherals (e.g. LCD controller on TNETV107X)
need to be put into SwRstDisable = 0 on clock disable, to maintain
hardware sanity.
This patch extends the davinci_psc_config() arguments to pass in the desired
module state instead of a boolean enable/disable. Further, clk_disable() now
checks for the PSC_SWRSTDISABLE clk flag before selecting the target state.
Signed-off-by: Cyril Chemparathy <cyril@ti.com>
Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
diff --git a/arch/arm/mach-davinci/clock.c b/arch/arm/mach-davinci/clock.c
index 058c77f..5de60ae 100644
--- a/arch/arm/mach-davinci/clock.c
+++ b/arch/arm/mach-davinci/clock.c
@@ -43,7 +43,8 @@
if (clk->parent)
__clk_enable(clk->parent);
if (clk->usecount++ == 0 && (clk->flags & CLK_PSC))
- davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, 1);
+ davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc,
+ PSC_STATE_ENABLE);
}
static void __clk_disable(struct clk *clk)
@@ -52,7 +53,9 @@
return;
if (--clk->usecount == 0 && !(clk->flags & CLK_PLL) &&
(clk->flags & CLK_PSC))
- davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc, 0);
+ davinci_psc_config(psc_domain(clk), clk->gpsc, clk->lpsc,
+ (clk->flags & PSC_SWRSTDISABLE) ?
+ PSC_STATE_SWRSTDISABLE : PSC_STATE_DISABLE);
if (clk->parent)
__clk_disable(clk->parent);
}
@@ -234,7 +237,10 @@
continue;
pr_info("Clocks: disable unused %s\n", ck->name);
- davinci_psc_config(psc_domain(ck), ck->gpsc, ck->lpsc, 0);
+
+ davinci_psc_config(psc_domain(ck), ck->gpsc, ck->lpsc,
+ (ck->flags & PSC_SWRSTDISABLE) ?
+ PSC_STATE_SWRSTDISABLE : PSC_STATE_DISABLE);
}
spin_unlock_irq(&clockfw_lock);