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msm: acpuclock-krait: Disable secondary clock source gating during switches

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To workaround a Krait errata on 8064, disable secondary clock source
gating during the MUX switch. This errata was already worked around
in msm-krait-l2-accessors.c in a different way, but that will soon
be removed in favor of this and some power-collapse changes.

Signed-off-by: Matt Wagantall <mattw@codeaurora.org>

Change-Id: Iffe42ee7216c9b9c4a4e68ddfe80fbc03b0413b0
Signed-off-by: Neha Pandey <nehap@codeaurora.org>
This commit is contained in:
Matt Wagantall
2012-09-25 12:47:24 -07:00
committed by Stephen Boyd
parent c57174ee8f
commit d42d5cc612
1 changed files with 12 additions and 0 deletions
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12
arch/arm/mach-msm/acpuclock-krait.c
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@@ -43,6 +43,8 @@
#define PRI_SRC_SEL_HFPLL 1
#define PRI_SRC_SEL_HFPLL_DIV2 2
#define SECCLKAGD BIT(4)
static DEFINE_MUTEX(driver_lock);
static DEFINE_SPINLOCK(l2_lock);
@@ -81,10 +83,20 @@ static void __cpuinit set_sec_clk_src(struct scalable *sc, u32 sec_src_sel)
{
u32 regval;
/* 8064 Errata: disable sec_src clock gating during switch. */
regval = get_l2_indirect_reg(sc->l2cpmr_iaddr);
regval |= SECCLKAGD;
set_l2_indirect_reg(sc->l2cpmr_iaddr, regval);
/* Program the MUX */
regval &= ~(0x3 << 2);
regval |= ((sec_src_sel & 0x3) << 2);
set_l2_indirect_reg(sc->l2cpmr_iaddr, regval);
/* 8064 Errata: re-enabled sec_src clock gating. */
regval &= ~SECCLKAGD;
set_l2_indirect_reg(sc->l2cpmr_iaddr, regval);
/* Wait for switch to complete. */
mb();
udelay(1);