From: Sean Paul <seanpaul@xxxxxxxxxxxx>
Instead of just waiting 20ms for training to complete, actually poll the
status to ensure training is finished.
Changes in v3:
- Added to the set
Cc: Sandeep Panda <spanda@xxxxxxxxxxxxxx>
Signed-off-by: Sean Paul <seanpaul@xxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/ti-sn65dsi86.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
index f02bdedae1e5e..d3e27e52ea759 100644
--- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c
+++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c
@@ -493,7 +493,17 @@ static void ti_sn_bridge_enable(struct drm_bridge *bridge)
/* Semi auto link training mode */
regmap_write(pdata->regmap, SN_ML_TX_MODE_REG, 0x0A);
- msleep(20); /* 20ms delay recommended by spec */
+ ret = regmap_read_poll_timeout(pdata->regmap, SN_ML_TX_MODE_REG, val,
+ val == ML_TX_MAIN_LINK_OFF ||
+ val == ML_TX_NORMAL_MODE, 1000,
+ 500 * 1000);
+ if (ret) {
+ DRM_ERROR("Training complete polling failed (%d)\n", ret);
+ return;
+ } else if (val == ML_TX_MAIN_LINK_OFF) {
+ DRM_ERROR("Link training failed, link is off\n");
+ return;
+ }
/* config video parameters */
ti_sn_bridge_set_video_timings(pdata);
--
Sean Paul, Software Engineer, Google / Chromium OS
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