diff options
| author | Narender Ankam <nankam@codeaurora.org> | 2019-07-31 13:42:25 +0530 |
|---|---|---|
| committer | Narender Ankam <nankam@codeaurora.org> | 2019-07-31 13:45:15 +0530 |
| commit | 01e259a1852a6e7c2e73d2491d11a0b792edd29e (patch) | |
| tree | f7bff170122b39b2fb1c353dda0a758688c20321 | |
| parent | d6bf038c87da4cf877dc65324a7483eca7b38059 (diff) | |
msm: mdss: hdmi: adjust HDMI DDC speed configuration
HDMI 2.0 compliance E-DDC test requires the DDC
signal timings to meet a minimum threshold to pass
the compliance test. Current DDC settings were not
matching the requirement.
Adjust the DDC settings to meet the threshold and
also make sure to leave the remaining bits of DDC
speed register untouched.
Change-Id: I9a33ba38baa8be94dee5447e79ad0a3a2a0bc8be
Signed-off-by: Narender Ankam <nankam@codeaurora.org>
| -rw-r--r-- | drivers/video/fbdev/msm/mdss_hdmi_util.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/video/fbdev/msm/mdss_hdmi_util.c b/drivers/video/fbdev/msm/mdss_hdmi_util.c index 1384c39d4c6f..c7a9c530eedb 100644 --- a/drivers/video/fbdev/msm/mdss_hdmi_util.c +++ b/drivers/video/fbdev/msm/mdss_hdmi_util.c @@ -1,4 +1,4 @@ -/* Copyright (c) 2010-2017, The Linux Foundation. All rights reserved. +/* Copyright (c) 2010-2017, 2019, 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 @@ -957,13 +957,17 @@ error: void hdmi_ddc_config(struct hdmi_tx_ddc_ctrl *ddc_ctrl) { + u32 ddc_speed; + if (!ddc_ctrl || !ddc_ctrl->io) { pr_err("invalid input\n"); return; } /* Configure Pre-Scale multiplier & Threshold */ - DSS_REG_W_ND(ddc_ctrl->io, HDMI_DDC_SPEED, (10 << 16) | (2 << 0)); + ddc_speed = DSS_REG_R_ND(ddc_ctrl->io, HDMI_DDC_SPEED); + ddc_speed |= (12 << 16) | (2 << 0); + DSS_REG_W_ND(ddc_ctrl->io, HDMI_DDC_SPEED, ddc_speed); /* * Setting 31:24 bits : Time units to wait before timeout |