cpm2: Round the baud-rate clock divider to the nearest integer.
Instead of rounding the divider down, improve the baud-rate generators
accuracy by rounding to the nearest integer.
Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/sysdev/cpm2.c b/arch/powerpc/sysdev/cpm2.c
index f1c3395..474d176 100644
--- a/arch/powerpc/sysdev/cpm2.c
+++ b/arch/powerpc/sysdev/cpm2.c
@@ -129,7 +129,8 @@
brg -= 4;
}
bp += brg;
- val = (((clk / rate) - 1) << 1) | CPM_BRG_EN | src;
+ /* Round the clock divider to the nearest integer. */
+ val = (((clk * 2 / rate) - 1) & ~1) | CPM_BRG_EN | src;
if (div16)
val |= CPM_BRG_DIV16;