From: Sean Paul Date: Mon, 13 Aug 2018 21:30:45 +0000 (-0400) Subject: drm/bridge: ti-sn65dsi86: Poll for training complete X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=638e9af16b95f6fe0141821d06360039c53ba84d;p=openwrt%2Fstaging%2Fblogic.git drm/bridge: ti-sn65dsi86: Poll for training complete 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 Reviewed-by: Sandeep Panda Signed-off-by: Sean Paul Link: https://patchwork.freedesktop.org/patch/msgid/20180813213058.184821-7-sean@poorly.run --- diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c index f02bdedae1e5..d3e27e52ea75 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);