The function twoToPowerOfx that iteratively caclulates the power of 2
may be replaced with shift operator
Signed-off-by: Mike Rapoport <mike.rapoport@xxxxxxxxx>
---
drivers/staging/sm750fb/ddk750_chip.c | 17 +++--------------
1 file changed, 3 insertions(+), 14 deletions(-)
diff --git a/drivers/staging/sm750fb/ddk750_chip.c b/drivers/staging/sm750fb/ddk750_chip.c
index 5e6798e..5dfd1e6 100644
--- a/drivers/staging/sm750fb/ddk750_chip.c
+++ b/drivers/staging/sm750fb/ddk750_chip.c
@@ -33,20 +33,9 @@ logical_chip_type_t getChipType(void)
return chip;
}
-
-inline unsigned int twoToPowerOfx(unsigned long x)
-{
- unsigned long i;
- unsigned long result = 1;
-
- for (i = 1; i <= x; i++)
- result *= 2;
- return result;
-}
-
inline unsigned int calcPLL(pll_value_t *pPLL)
{
- return (pPLL->inputFreq * pPLL->M / pPLL->N / twoToPowerOfx(pPLL->OD) / twoToPowerOfx(pPLL->POD));
+ return (pPLL->inputFreq * pPLL->M / pPLL->N / (1UL << pPLL->OD) / (1UL << pPLL->POD));
}
unsigned int getPllValue(clock_type_t clockType, pll_value_t *pPLL)
@@ -524,12 +513,12 @@ pll_value_t *pPLL /* Structure to hold the value to be set in PLL */
#endif
/* Work out 2 to the power of POD */
- podPower = twoToPowerOfx(POD);
+ podPower = 1 << POD;
/* OD has only 2 bits [15:14] and its value must between 0 to 3 */
for (OD = 0; OD <= 3; OD++) {
/* Work out 2 to the power of OD */
- odPower = twoToPowerOfx(OD);
+ odPower = 1 << OD;
#ifdef VALIDATION_CHIP
if (odPower > 4)
--
2.1.0
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