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PM / devfreq: bimc-bwmon: Reduce margin for HW workaround

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The HW workaround margin being too high reduces the effectiveness of the
interrupt. Try using a margin only when the measured bandwidth is too small
and risks the counter wrapping around multiple times before it's read.

Change-Id: Ic1e88ad360b2348dfb9ad314c42c1b0218010c1d
Signed-off-by: Saravana Kannan <skannan@codeaurora.org>
This commit is contained in:
Saravana Kannan 2014-08-20 17:30:16 -07:00
parent 169417fed7
commit 67616a640e
1 changed files with 5 additions and 2 deletions
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7
drivers/devfreq/bimc-bwmon.c
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@ -163,8 +163,11 @@ static unsigned long meas_bw_and_set_irq(struct bw_hwmon *hw,
mbps = mon_get_count(m); mbps = mon_get_count(m);
mbps = bytes_to_mbps(mbps, us); mbps = bytes_to_mbps(mbps, us);
/* + 1024 is to workaround HW design issue. Needs further tuning. */ /*
limit = mbps_to_bytes(mbps + 1024, sample_ms, tol); * The fudging of mbps when calculating limit is to workaround a HW
* design issue. Needs further tuning.
*/
limit = mbps_to_bytes(max(mbps, 400UL), sample_ms, tol);
mon_set_limit(m, limit); mon_set_limit(m, limit);
mon_clear(m); mon_clear(m);