[PATCH v3 6/7] drm/bridge: ti-sn65dsi86: Poll for training complete

[spanda at codeaurora.org]

On 2018-08-14 03:00, Sean Paul wrote:
> From: Sean Paul <seanpaul at chromium.org>
> 
> 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 at codeaurora.org>
> Signed-off-by: Sean Paul <seanpaul at chromium.org>
> ---
>  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);
Reviewed-by: Sandeep Panda <spanda at codeaurora.org>