Commit d1a2e03e authored Jan 20, 2017 by Vishnuvardhan Prodduturi Committed by Gerrit - the friendly Code Review server Mar 06, 2017

msm: mdss: clear BTA_DONE interrupt during DSI read operations

In cases where DSI DMA done operation is performed but isr is
not triggered due to CPU delays, we clear only the DMA_DONE
interrupt. There is a possibility of a DSI read operation for
DSI command mode panels where the DMA_DONE interrupt is cleared and
DSI link clocks are turned off. After some time, the DSI isr gets
triggered for BTA_DONE interrupt and since DSI link clocks are off,
this causes an interrupt storm due to BTA_DONE interrupt not getting
cleared. Clear the BTA_DONE interrupt as well for cases where DMA_DONE
operation is done but isr not getting triggered.

Change-Id: Iceb02e6dd78f4bbf313e2b4d252d6a30699619f0
Signed-off-by: Padmanabhan Komanduru <pkomandu@codeaurora.org>
Signed-off-by: Vishnuvardhan Prodduturi <vproddut@codeaurora.org>

parent 9dda3223

drivers/video/fbdev/msm/mdss_dsi_host.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -2148,8 +2148,8 @@ static int mdss_dsi_cmd_dma_tx(struct mdss_dsi_ctrl_pdata *ctrl,
		status = reg_val & DSI_INTR_CMD_DMA_DONE;
		if (status) {
		reg_val &= DSI_INTR_MASK_ALL;
		/* clear CMD DMA isr only */
		reg_val \|= DSI_INTR_CMD_DMA_DONE;
		/* clear CMD DMA and BTA_DONE isr only */
		reg_val \|= (DSI_INTR_CMD_DMA_DONE \| DSI_INTR_BTA_DONE);
		MIPI_OUTP(ctrl->ctrl_base + 0x0110, reg_val);
		mdss_dsi_disable_irq_nosync(ctrl, DSI_CMD_TERM);
		complete(&ctrl->dma_comp);