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 --- drivers/clk/at91/clk-utmi.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
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 @@ static int utmi_clk_enable(struct clk *clk) 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 @@ static int utmi_clk_enable(struct clk *clk) 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; }