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Commit 660cc575 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: Add delay for rx invalid transfer 



Check for RX data in rx buffer for faulty transfer and add
delay of 2 msecs delay in order for dma rx transfer
to be actually completed.

Also dump required qup registers when the uart dma rx data is
seen as all zeros.

Change-Id: Ifaa0cb7d22b8419ffacfee7212b0a28ed8ebf2a1
Signed-off-by: default avatarChandana Kishori Chiluveru <cchiluve@codeaurora.org>
parent 7265cb7f

drivers/tty/serial/msm_geni_serial.c

+38 −0
Original line number Diff line number Diff line
@@ -1712,6 +1712,40 @@ static int msm_geni_serial_handle_tx(struct uart_port *uport, bool done, 
	return 0;

}



static void check_rx_buf(char *buf, struct uart_port *uport, int size)

{

	struct msm_geni_serial_port *msm_port = GET_DEV_PORT(uport);

	unsigned int rx_data;

	bool fault = false;



	rx_data = *(u32 *)buf;

	/* check for first 4 bytes of RX data for faulty zero pattern */

	if (rx_data == 0x0) {

		if (size <= 4) {

			fault = true;

		} else {

			/*

			 * check for last 4 bytes of data in RX buffer for

			 * faulty pattern

			 */

			if (memcmp(buf+(size-4), "\x0\x0\x0\x0", 4) == 0)

				fault = true;

		}



		if (fault) {

			IPC_LOG_MSG(msm_port->ipc_log_rx,

				"RX Invalid packet %s\n", __func__);

			geni_se_dump_dbg_regs(&msm_port->serial_rsc,

				uport->membase, msm_port->ipc_log_misc);

			/*

			 * Add 2 msecs delay in order for dma rx transfer

			 * to be actually completed.

			 */

			udelay(2000);

		}

	}

}



static int msm_geni_serial_handle_dma_rx(struct uart_port *uport, bool drop_rx)

{

	struct msm_geni_serial_port *msm_port = GET_DEV_PORT(uport);
@@ -1740,6 +1774,10 @@ static int msm_geni_serial_handle_dma_rx(struct uart_port *uport, bool drop_rx) 
					__func__, rx_bytes);

		goto exit_handle_dma_rx;

	}



	/* Check RX buffer data for faulty pattern*/

	check_rx_buf((char *)msm_port->rx_buf, uport, rx_bytes);



	if (drop_rx)

		goto exit_handle_dma_rx;