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drm/msm/dp: add extra 100ms sleep when MSTM_CTRL is not cleared

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Add extra sleep between SST and MST mode if MSTM_CTRL is not cleared
at hpd to make sure dongle exit from previous MST state.

CRs-Fixed: 2411911
Change-Id: I5b1785c71a91df95167bf5083e9d752a275872a8
Signed-off-by: Xiaowen Wu <wxiaowen@codeaurora.org>
Signed-off-by: Fuad Hossain <fhossain@codeaurora.org>
This commit is contained in:
Xiaowen Wu
2019-03-06 17:24:56 -05:00
committed by Fuad Hossain
parent d54b69e258
commit 162fff1195
1 changed files with 12 additions and 0 deletions
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12
msm/dp/dp_display.c
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@@ -635,6 +635,8 @@ static void dp_display_process_mst_hpd_high(struct dp_display_private *dp,
{
bool is_mst_receiver;
struct dp_mst_hpd_info info;
const unsigned long clear_mstm_ctrl_timeout_us = 100000;
u8 old_mstm_ctrl;
int ret;
if (!dp->parser->has_mst || !dp->mst.drm_registered) {
@@ -654,8 +656,18 @@ static void dp_display_process_mst_hpd_high(struct dp_display_private *dp,
}
/* clear sink mst state */
drm_dp_dpcd_readb(dp->aux->drm_aux, DP_MSTM_CTRL,
&old_mstm_ctrl);
drm_dp_dpcd_writeb(dp->aux->drm_aux, DP_MSTM_CTRL, 0);
/* add extra delay if MST state is not cleared */
if (old_mstm_ctrl) {
DP_MST_DEBUG("MSTM_CTRL is not cleared, wait %dus\n",
clear_mstm_ctrl_timeout_us);
usleep_range(clear_mstm_ctrl_timeout_us,
clear_mstm_ctrl_timeout_us + 1000);
}
ret = drm_dp_dpcd_writeb(dp->aux->drm_aux, DP_MSTM_CTRL,
DP_MST_EN | DP_UP_REQ_EN | DP_UPSTREAM_IS_SRC);
if (ret < 0) {