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authorEugen Hristev <eugen.hristev@microchip.com>2018-08-03 12:10:49 +0300
committerTom Rini <trini@konsulko.com>2018-08-13 14:03:57 -0400
commite9cd3d70244a4a262c6b1935df87c85d25df5344 (patch)
treed16c36696f4b17b418ead404bd8c5358f9087b15 /drivers/clk
parent1246040cdaa5c9a1d7216777b06c11c441a187ea (diff)
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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>
Diffstat (limited to 'drivers/clk')
-rw-r--r--drivers/clk/at91/clk-utmi.c7
1 files changed, 6 insertions, 1 deletions
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;
}