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Commit 1929e59a authored by Naveen Kaje's avatar Naveen Kaje
Browse files

msm_serial_hs: Track TX transmit time and detect errors 



The time taken to complete TX data transmission
from the UART hardware FIFOs are tracked, so that,
the tranmsission errors due to the remote entity disabling
the flow control line for unusually long duration are
tracked and logged.

Change-Id: I4f85aff2801f90add8c9d01a2f0b870fb91ab898
Signed-off-by: default avatarNaveen Kaje <nkaje@codeaurora.org>
parent a206d164

drivers/tty/serial/msm_serial_hs.c

+32 −0
Original line number Diff line number Diff line
@@ -180,6 +180,7 @@ struct msm_hs_tx { 
	dma_addr_t dma_base;

	struct tasklet_struct tlet;

	struct msm_hs_sps_ep_conn_data cons;

	struct timer_list tx_timeout_timer;

};



struct msm_hs_rx {
@@ -1296,6 +1297,29 @@ static void msm_hs_stop_rx_locked(struct uart_port *uport) 
	}

}



/* Tx timeout callback function */

void tx_timeout_handler(unsigned long arg)

{

	struct msm_hs_port *msm_uport = (struct msm_hs_port *) arg;

	struct uart_port *uport = &msm_uport->uport;

	int isr;



	if (msm_uport->clk_state != MSM_HS_CLK_ON) {

		MSM_HS_WARN("%s(): clocks are off", __func__);

		return;

	}



	isr = msm_hs_read(uport, UART_DM_ISR);

	if (UARTDM_ISR_CURRENT_CTS_BMSK & isr)

		MSM_HS_WARN("%s(): CTS Disabled, ISR 0x%x", __func__, isr);

	dump_uart_hs_registers(msm_uport);

	/* Log BAM TX pipe debug information */

	sps_get_bam_debug_info(msm_uport->bam_handle,

			93,

			SPS_BAM_PIPE(msm_uport->bam_tx_ep_pipe_index),

			0, 2);

}



/*  Transmit the next chunk of data */

static void msm_hs_submit_tx_locked(struct uart_port *uport)

{
@@ -1354,6 +1378,10 @@ static void msm_hs_submit_tx_locked(struct uart_port *uport) 
	ret = sps_transfer_one(sps_pipe_handle, src_addr, tx_count,

				msm_uport, flags);



	/* Set 1 second timeout */

	mod_timer(&tx->tx_timeout_timer,

		jiffies + msecs_to_jiffies(MSEC_PER_SEC));



	MSM_HS_DBG("%s:Enqueue Tx Cmd, ret %d\n", __func__, ret);

}
@@ -1764,6 +1792,7 @@ static void msm_hs_sps_tx_callback(struct sps_event_notify *notify) 
	notify->data.transfer.iovec.flags,

	msm_uport->uport.line);



	del_timer(&msm_uport->tx.tx_timeout_timer);

	tasklet_schedule(&msm_uport->tx.tlet);

}
@@ -2641,6 +2670,9 @@ static int msm_hs_startup(struct uart_port *uport) 
	tx->tx_ready_int_en = 0;

	tx->dma_in_flight = 0;

	MSM_HS_DBG("%s():desc usage flag 0x%lx", __func__, rx->queued_flag);

	setup_timer(&(tx->tx_timeout_timer),

			tx_timeout_handler,

			(unsigned long) msm_uport);



	/* Enable reading the current CTS, no harm even if CTS is ignored */

	msm_uport->imr_reg |= UARTDM_ISR_CURRENT_CTS_BMSK;