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arm: mxs: be more careful when enabling gpmi_clk

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The data sheet says that the DIV field cannot change while the CLKGATE
bit is set or modified. So do it a little more carefully, by first
clearing the bit, waiting for that to appear, then setting the DIV
field.

Signed-off-by: Rasmus Villemoes <rasmus.villemoes@prevas.dk>
This commit is contained in:
Rasmus Villemoes 2019-09-12 09:17:11 +00:00 committed by Stefano Babic
parent fb94625229
commit abaf5c9804
1 changed files with 4 additions and 1 deletions
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5
arch/arm/cpu/arm926ejs/mxs/mxs.c
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@ -103,8 +103,11 @@ int arch_cpu_init(void)
&clkctrl_regs->hw_clkctrl_clkseq_set);
/* Set GPMI clock to ref_xtal / 1 */
clrbits_le32(&clkctrl_regs->hw_clkctrl_gpmi, CLKCTRL_GPMI_CLKGATE);
while (readl(&clkctrl_regs->hw_clkctrl_gpmi) & CLKCTRL_GPMI_CLKGATE)
;
clrsetbits_le32(&clkctrl_regs->hw_clkctrl_gpmi,
CLKCTRL_GPMI_CLKGATE | CLKCTRL_GPMI_DIV_MASK, 1);
CLKCTRL_GPMI_DIV_MASK, 1);
udelay(1000);