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devfreq: memlat: Fix macros to support 32 bit kernels

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Cast MBYTE macro to unsiged long instead of unsigned long long.
Unsigned long long causes division errors when used for 32 bit
kernels. Also, add a new macro for Mbps to icc conversion
without loss of precision.

Change-Id: I584869c510d614e47ab7090a1f328df307d412a8
Signed-off-by: Rishabh Bhatnagar <[email protected]>
This commit is contained in:
Rishabh Bhatnagar 2020-12-18 15:46:30 -08:00
commit 7bbba81366
1 changed files with 5 additions and 4 deletions
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9
drivers/devfreq/devfreq_icc.c
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@ -27,10 +27,11 @@
#include <linux/interconnect.h>
#include <soc/qcom/devfreq_icc.h>
/* Has to be ULL to prevent overflow where this macro is used. */
#define MBYTE (1ULL << 20)
/* Has to be UL to avoid errors in 32 bit. Use cautiously to avoid overflows.*/
#define MBYTE (1UL << 20)
#define HZ_TO_MBPS(hz, w) (mult_frac(w, hz, MBYTE))
#define MBPS_TO_HZ(mbps, w) (mult_frac(mbps, MBYTE, w))
#define MBPS_TO_ICC(mbps) (mult_frac(mbps, MBYTE, 1000))
enum dev_type {
STD_MBPS_DEV,
@ -72,8 +73,8 @@ static int set_bw(struct device *dev, u32 new_ib, u32 new_ab)
icc_ib = MBPS_TO_HZ(new_ib, d->width);
icc_ab = MBPS_TO_HZ(new_ab, d->width);
} else if (d->spec->type == STD_MBPS_DEV) {
icc_ib = Bps_to_icc(new_ib * MBYTE);
icc_ab = Bps_to_icc(new_ab * MBYTE);
icc_ib = MBPS_TO_ICC(new_ib);
icc_ab = MBPS_TO_ICC(new_ab);
}
dev_dbg(dev, "ICC BW: AB: %u IB: %u\n", icc_ab, icc_ib);