diff options
| author | Sandeep Panda <spanda@codeaurora.org> | 2017-01-23 16:48:23 +0530 |
|---|---|---|
| committer | Sandeep Panda <spanda@codeaurora.org> | 2017-03-20 14:41:28 +0530 |
| commit | 04ee7723d77f8d0f497dbf87e6dae9c174d75754 (patch) | |
| tree | 64bd9177834a0dbf340f1beee833fba0a1ef2845 /drivers/video/fbdev | |
| parent | f39a5999e2473e890390e3a5aa794a2fd4256544 (diff) | |
msm: mdss: ensure proper state transition during ULPS exit
During stress environment, sometimes DSI ULPS exit sequence
does not work properly. Add memory barriers while programing
DSI lane register to ensure proper state transition of DSI
lane during ULPS exit.
Change-Id: Ib50958cf342bf23ab44f5a9d3bdf60adad824145
Signed-off-by: Sandeep Panda <spanda@codeaurora.org>
Diffstat (limited to 'drivers/video/fbdev')
| -rw-r--r-- | drivers/video/fbdev/msm/msm_mdss_io_8974.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/drivers/video/fbdev/msm/msm_mdss_io_8974.c b/drivers/video/fbdev/msm/msm_mdss_io_8974.c index e6151b4c75a1..8236a17c9bbe 100644 --- a/drivers/video/fbdev/msm/msm_mdss_io_8974.c +++ b/drivers/video/fbdev/msm/msm_mdss_io_8974.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2012-2016, The Linux Foundation. All rights reserved. +/* Copyright (c) 2012-2017, The Linux Foundation. All rights reserved. * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License version 2 and @@ -1863,8 +1863,10 @@ static int mdss_dsi_ulps_config_default(struct mdss_dsi_ctrl_pdata *ctrl, * to be in stop state. */ MIPI_OUTP(ctrl->ctrl_base + 0x0AC, active_lanes << 16); + wmb(); /* ensure lanes are put to stop state */ MIPI_OUTP(ctrl->ctrl_base + 0x0AC, 0x0); + wmb(); /* ensure lanes are in proper state */ lane_status = MIPI_INP(ctrl->ctrl_base + 0xA8); } |