cpufreq: interactive: Use default min_sample_time if SDF is zero

Use min_sample_time to step down from max frequencies if
sampling_down_factor is set to zero.

Change-Id: I2e89bef6220557cb95efd20d658e0c05753b4c3c
Signed-off-by: Rohit Gupta <rohgup@codeaurora.org>

drivers/cpufreq/cpufreq_interactive.c

@@ -477,11 +477,10 @@ static void cpufreq_interactive_timer(unsigned long data)
 	 * Do not scale below floor_freq unless we have been at or above the
 	 * floor frequency for the minimum sample time since last validated.
 	 */
-	if (pcpu->policy->cur == pcpu->policy->max) {
+	if (sampling_down_factor && pcpu->policy->cur == pcpu->policy->max)
 		mod_min_sample_time = sampling_down_factor;
-	} else {
+	else
 		mod_min_sample_time = min_sample_time;
-	}
 
 	if (new_freq < pcpu->floor_freq) {
 		if (now - pcpu->floor_validate_time < mod_min_sample_time) {