Commit 5dd29115 authored Feb 08, 2017 by Ajay Singh Parmar Committed by Gerrit - the friendly Code Review server Mar 08, 2017

msm: mdss: dp: fix link training routine for VGA monitors



Fix the link training routine by removing the updates to
the state control register and the corresponding memory
barrier to complete the register write. This changes fixes
the link training failures seen with VGA monitors over the
Type-C/VGA dongle interface.

CRs-Fixed: 2008753
Change-Id: I501833e02d24d6aa12351eb0bd067a08ad597ed0
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>

parent 49237b20

drivers/video/fbdev/msm/mdss_dp_aux.c

+1 −5

Original line number	Diff line number	Diff line
		@@ -2247,12 +2247,8 @@ static int dp_start_link_train_2(struct mdss_dp_drv_pdata *ep)
		else
		pattern = 0x02;

		dp_write(ep->base + DP_STATE_CTRL, 0x0);
		/* Make sure to clear the current pattern before starting a new one */
		wmb();

		dp_host_train_set(ep, pattern);
		mdss_dp_aux_update_voltage_and_pre_emphasis_lvl(ep);
		dp_host_train_set(ep, pattern);
		dp_train_pattern_set_write(ep, pattern \| 0x20);/* train_2 */

		do {