Commit a4f43601 authored Apr 21, 2016 by Padmanabhan Komanduru Committed by Gerrit - the friendly Code Review server Sep 20, 2016

msm: mdss: do not report overflow errors during read commands

During a DSI DMA read command transaction, it is expected to have
DSI FIFO overflow if the read operation duration exceeds one BLLP
line time frame. Make sure not to trigger DSI FIFO overflow recovery
sequence for such cases where DSI FIFO overflow error is masked.

Change-Id: I0762a0f51d580a44cfa24ffac60cc465c241c733
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>

parent 1a5123de

drivers/video/msm/mdss/mdss_dsi_host.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -2970,6 +2970,13 @@ static bool mdss_dsi_fifo_status(struct mdss_dsi_ctrl_pdata *ctrl)

		pr_err("%s: status=%x\n", __func__, status);

		/*
		* if DSI FIFO overflow is masked,
		* do not report overflow error
		*/
		if (MIPI_INP(base + 0x10c) & 0xf0000)
		status = status & 0xaaaaffff;

		if (status & 0x44440000) {/* DLNx_HS_FIFO_OVERFLOW */
		dsi_send_events(ctrl, DSI_EV_DLNx_FIFO_OVERFLOW, 0);
		/* Ignore FIFO EMPTY when overflow happens */