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Commit f30aac1b authored by Chandana Kishori Chiluveru's avatar Chandana Kishori Chiluveru Committed by Gerrit - the friendly Code Review server
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serial: msm_geni_serial: Reduce stale delay added in stop_rx_sequencer 



Currently driver calculating stale delay based on baud rate during
stop_rx sequencer. When BT started with lower baud rate like 2400
this logic will add around 130msecs of extra delay during BT INIT.

This change will remove logic for stale delay calculation
based on baud rate and add constant delay of 10msec to
wait for stale interrupt during stop_rx_sequencer.

Change-Id: I566d79145ba887de71482642655b63c5bd640fc8
Signed-off-by: default avatarChandana Kishori Chiluveru <cchiluve@codeaurora.org>
parent c688b1ea

drivers/tty/serial/msm_geni_serial.c

+6 −10
Original line number Diff line number Diff line
@@ -106,7 +106,7 @@ 
#define STALE_TIMEOUT		(16)

#define STALE_COUNT		(DEFAULT_BITS_PER_CHAR * STALE_TIMEOUT)

#define SEC_TO_USEC		(1000000)

#define SYSTEM_DELAY		(500)

#define STALE_DELAY		(10000) //10msec

#define DEFAULT_BITS_PER_CHAR	(10)

#define GENI_UART_NR_PORTS	(6)

#define GENI_UART_CONS_PORTS	(1)
@@ -1559,7 +1559,6 @@ static int stop_rx_sequencer(struct uart_port *uport) 
	struct msm_geni_serial_port *port = GET_DEV_PORT(uport);

	unsigned long flags = 0;

	bool is_rx_active;

	unsigned int stale_delay;

	u32 dma_rx_status, s_irq_status;

	int usage_count;
@@ -1576,15 +1575,12 @@ static int stop_rx_sequencer(struct uart_port *uport) 


	if (!uart_console(uport)) {

		/*

		 * Wait for the stale timeout to happen if there

		 * is any data pending in the rx fifo.

		 * Have a safety factor of 2 to include the interrupt

		 * and system latencies, add 500usec delay for interrupt

		 * latency or system delay.

		 * Wait for the stale timeout around 10msec to happen

		 * if there is any data pending in the rx fifo.

		 * This will help to handle incoming rx data in stop_rx_sequencer

		 * for interrupt latency or system delay cases.

		 */

		stale_delay = (STALE_COUNT * SEC_TO_USEC) / port->cur_baud;

		stale_delay = (2 * stale_delay) + SYSTEM_DELAY;

		udelay(stale_delay);

		udelay(STALE_DELAY);



		dma_rx_status = geni_read_reg_nolog(uport->membase,

						SE_DMA_RX_IRQ_STAT);