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clk: at91: utmi: add timeout for utmi lock

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In case the slow clock is not properly configured, the UTMI clock
cannot lock the PLL, because UPLLCOUNT will "wait X slow clock cycles".
In this case U-boot will loop indefinitely.
Added a timeout in this case, to start U-boot even if UTMI clock is
not enabled, so the user can use different media if needed, or investigate.

Signed-off-by: Eugen Hristev <eugen.hristev@microchip.com>
This commit is contained in:
Eugen Hristev 2018-08-03 12:10:49 +03:00 • committed by Tom Rini
parent 1246040cda
commit e9cd3d7024
1 changed files with 6 additions and 1 deletions
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7
drivers/clk/at91/clk-utmi.c
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@ -28,6 +28,7 @@ static int utmi_clk_enable(struct clk *clk)
u32 utmi_ref_clk_freq; u32 utmi_ref_clk_freq;
u32 tmp; u32 tmp;
int err; int err;
int timeout = 2000000;
if (readl(&pmc->sr) & AT91_PMC_LOCKU) if (readl(&pmc->sr) & AT91_PMC_LOCKU)
return 0; return 0;
@ -85,8 +86,12 @@ static int utmi_clk_enable(struct clk *clk)
AT91_PMC_BIASEN; AT91_PMC_BIASEN;
writel(tmp, &pmc->uckr); writel(tmp, &pmc->uckr);
while (!(readl(&pmc->sr) & AT91_PMC_LOCKU)) while ((--timeout) && !(readl(&pmc->sr) & AT91_PMC_LOCKU))
; ;
if (!timeout) {
printf("UTMICK: timeout waiting for UPLL lock\n");
return -ETIMEDOUT;
}
return 0; return 0;
} }