clk: at91: utmi: add timeout for utmi lock
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>
diff --git a/drivers/clk/at91/clk-utmi.c b/drivers/clk/at91/clk-utmi.c
index 0b56261..e850609 100644
--- a/drivers/clk/at91/clk-utmi.c
+++ b/drivers/clk/at91/clk-utmi.c
@@ -28,6 +28,7 @@
u32 utmi_ref_clk_freq;
u32 tmp;
int err;
+ int timeout = 2000000;
if (readl(&pmc->sr) & AT91_PMC_LOCKU)
return 0;
@@ -85,8 +86,12 @@
AT91_PMC_BIASEN;
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;
}