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ddr: fix bandwidth read result 0 on 32bit OS [1/1]

Browse Source 
PD#SWPL-960

Problem:
Reading bandwidth of DDR from sysfs get all 0 result on 32
bit kernel

Solution:
Fix overflow when calculating bandwidth.

Verify:
P212

Change-Id: I35837db653bdc2d97ced98689546a9ffc0db21c7
Signed-off-by: tao zeng <tao.zeng@amlogic.com>
This commit is contained in:
tao zeng
2018-10-29 12:11:18 +08:00
committed by Jianxin Pan
parent d351b585a5
commit 8b2c5df07a
1 changed files with 9 additions and 3 deletions
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12
drivers/amlogic/ddr_tool/ddr_bandwidth.c
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@@ -40,17 +40,23 @@ static void cal_ddr_usage(struct ddr_bandwidth *db, struct ddr_grant *dg)
if (db->ops && db->ops->get_freq)
freq = db->ops->get_freq(db);
mul = (dg->all_grant * 10000ULL) / 16; /* scale up to keep precision*/
mul = dg->all_grant;
mul *= 10000ULL;
mul /= 16;
cnt = db->clock_count;
do_div(mul, cnt);
db->total_usage = mul;
if (freq) {
/* calculate in KB */
mul = (dg->all_grant * freq) / 1024;
mul = dg->all_grant;
mul *= freq;
mul /= 1024;
do_div(mul, cnt);
db->total_bandwidth = mul;
for (i = 0; i < db->channels; i++) {
mul = (dg->channel_grant[i] * freq) / 1024;
mul = dg->channel_grant[i];
mul *= freq;
mul /= 1024;
do_div(mul, cnt);
db->bandwidth[i] = mul;
}