Merge "serial: msm_serial_hs: Add extra delay during close with pending tx"

#include <linux/kernel.h>

#include <linux/timer.h>

#include <linux/clk.h>

#include <linux/delay.h>

#include <linux/platform_device.h>

#include <linux/pm_runtime.h>

#include <linux/dma-mapping.h>

unsigned int msm_hs_tx_empty(struct uart_port *uport)

{

	unsigned int data;

	unsigned int isr;

	unsigned int ret = 0;

	struct msm_hs_port *msm_uport = UARTDM_TO_MSM(uport);

	msm_hs_resource_vote(msm_uport);

	data = msm_hs_read(uport, UART_DM_SR);

	isr = msm_hs_read(uport, UART_DM_ISR);

	msm_hs_resource_unvote(msm_uport);

	MSM_HS_DBG("%s(): SR Reg Read 0x%x", __func__, data);

	MSM_HS_INFO("%s(): SR:0x%x ISR:0x%x ", __func__, data, isr);

	if (data & UARTDM_SR_TXEMT_BMSK)

	if (data & UARTDM_SR_TXEMT_BMSK) {

		ret = TIOCSER_TEMT;

	} else

		/*

		 * Add an extra sleep here because sometimes the framework's

		 * delay (based on baud rate) isn't good enough.

		 * Note that this won't happen during every port close, only

		 * on select occassions when the userspace does back to back

		 * write() and close().

		 */

		usleep_range(5000, 7000);

	return ret;

}