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tegra: clock: Avoid a divide-by-zero error

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The clock fix-up for tegra is still present in the code. It causes a
divide-by-zero bug after relocation when chain-loading U-Boot from
coreboot. Fix this by adding a check.

Signed-off-by: Simon Glass <sjg@chromium.org>
Fixes: 7468676 (ARM: tegra: fix clock_get_periph_rate() for UART clocks)
This commit is contained in:
Simon Glass
2017-05-31 17:57:22 -06:00
parent 06cc85a29a
commit 1c6c7b6bd8
1 changed files with 4 additions and 1 deletions
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3
arch/arm/mach-tegra/clock.c
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@@ -339,7 +339,10 @@ unsigned long clock_get_periph_rate(enum periph_id periph_id,
* return value doesn't help. In summary this clock driver is * return value doesn't help. In summary this clock driver is
* quite broken but I'm afraid I have no idea how to fix it * quite broken but I'm afraid I have no idea how to fix it
* without completely replacing it. * without completely replacing it.
*
* Be careful to avoid a divide by zero error.
*/ */
if (div >= 1)
div -= 2; div -= 2;
break; break;
#endif #endif