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Commit 398c89ff authored by Prateek Raj Singh's avatar Prateek Raj Singh Committed by Gerrit - the friendly Code Review server
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FM: Reduce high scan time 



Changed logic to find Lower Band Limit from Search Up from current
channel with Wrap enable to tuning to Lower Band Limit + chan space
and Search Down with Wrap disable.

Change-Id: I79a686238d96db5dd5df9436b346b465435ae4f5
Signed-off-by: default avatarPrateek Raj Singh <pratsing@codeaurora.org>
parent 91a7f066

drivers/media/radio/rtc6226/radio-rtc6226-common.c

+27 −5
Original line number Diff line number Diff line
@@ -312,6 +312,7 @@ void rtc6226_scan(struct work_struct *work) 
	struct kfifo *data_b;

	int len = 0;

	u32 next_freq_khz;

	u8 factor;

	int retval = 0;

	int i, rssi;
@@ -427,7 +428,26 @@ void rtc6226_scan(struct work_struct *work) 
				TUNE_STEP_SIZE) == next_freq_khz) {

			FMDERR("%s Seek one more time if lower freq is valid\n",

					__func__);

			retval = rtc6226_set_seek(radio, SRCH_UP, WRAP_ENABLE);

			// Tuned to band low limit + chan spacing then seek down with

			// bandlimit config

			if (radio->space == 0)

				factor = 20;

			else if (radio->space == 1)

				factor = 10;

			else

				factor = 5;

			retval = rtc6226_set_freq(radio,

				(radio->recv_conf.band_low_limit + factor) * TUNE_STEP_SIZE);

			if (retval < 0)

				goto seek_tune_fail;

			/* wait for tune to complete. */

			if (!wait_for_completion_timeout(&radio->completion,

						msecs_to_jiffies(TUNE_TIMEOUT_MSEC))) {

				FMDERR("In %s, didn't receive STC for tune\n", __func__);

				rtc6226_q_event(radio, RTC6226_EVT_ERROR);

				return;

			}

			retval = rtc6226_set_seek(radio, SRCH_DOWN, WRAP_DISABLE);

			if (retval < 0) {

				FMDERR("%s seek fail %d\n", __func__, retval);

				goto seek_tune_fail;
@@ -454,10 +474,12 @@ void rtc6226_scan(struct work_struct *work) 
				rssi = radio->registers[RSSI] & RSSI_RSSI;

				FMDBG("%s freq %d, rssi %d rssi threshold %d\n",

				 __func__, next_freq_khz, rssi, radio->rssi_th);

				if ((radio->recv_conf.band_low_limit *

						TUNE_STEP_SIZE) ==

							next_freq_khz &&

						rssi >= radio->rssi_th) {

				// Reach to band low limit,

				// if SF is 0, means frequency at low limit is a commercial

				// station Or a invalid channel

				if (((radio->registers[STATUS] & STATUS_SF) == 0) ||

						(radio->recv_conf.band_high_limit *

						TUNE_STEP_SIZE) == next_freq_khz) {

					FMDERR("lower band freq is valid\n");

					rtc6226_q_event(radio,

						RTC6226_EVT_TUNE_SUCC);

drivers/media/radio/rtc6226/radio-rtc6226.h

+1 −1
Original line number Diff line number Diff line
@@ -200,7 +200,7 @@ 
#define SCAN_PENDING 3

#define START_SCAN 1

#define TUNE_TIMEOUT_MSEC 3000

#define SEEK_TIMEOUT_MSEC 15000

#define SEEK_TIMEOUT_MSEC 30000



#define RTC6226_MIN_SRCH_MODE 0x00

#define RTC6226_MAX_SRCH_MODE 0x02