Re: [PATCH] Revert "sna: Refresh last detection timestamp on hotplug notifies"

[Lyude <cpaul@redhat.com>]

Ping, any update on this?

On Wed, 2016-05-18 at 17:35 -0400, Lyude wrote:
> From: Lyude Paul <cpaul@redhat.com>
> 
> DRM does not always update the status of each connector during a
> hotplug event, and it's generally expected that userspace is supposed
> to
> handle that by reprobing. This happens in a couple situations:
> suspend/resume, MST hotplugs, and probably a few others. As a result,
> making this assumption actually breaks MST hotplugging.
> 
> Signed-off-by: Lyude <cpaul@redhat.com>
> ---
>  src/sna/sna_display.c | 17 +++++------------
>  1 file changed, 5 insertions(+), 12 deletions(-)
> 
> diff --git a/src/sna/sna_display.c b/src/sna/sna_display.c
> index 16d0321..6299d1e 100644
> --- a/src/sna/sna_display.c
> +++ b/src/sna/sna_display.c
> @@ -5038,14 +5038,11 @@ output_check_status(struct sna *sna, struct
> sna_output *output)
>  	switch (compat_conn.conn.connection) {
>  	case DRM_MODE_CONNECTED:
>  		status = XF86OutputStatusConnected;
> -		break;
>  	case DRM_MODE_DISCONNECTED:
>  		status = XF86OutputStatusDisconnected;
> -		break;
>  	default:
>  	case DRM_MODE_UNKNOWNCONNECTION:
>  		status = XF86OutputStatusUnknown;
> -		break;
>  	}
>  	return output->status == status;
>  }
> @@ -5055,7 +5052,7 @@ void sna_mode_discover(struct sna *sna, bool
> tell)
>  	ScreenPtr screen = xf86ScrnToScreen(sna->scrn);
>  	xf86CrtcConfigPtr config = XF86_CRTC_CONFIG_PTR(sna->scrn);
>  	struct drm_mode_card_res res;
> -	uint32_t connectors[32], now;
> +	uint32_t connectors[32];
>  	unsigned changed = 0;
>  	unsigned serial;
>  	int i, j;
> @@ -5087,7 +5084,6 @@ void sna_mode_discover(struct sna *sna, bool
> tell)
>  	if (serial == 0)
>  		serial = ++sna->mode.serial;
>  
> -	now = GetTimeInMillis();
>  	for (i = 0; i < res.count_connectors; i++) {
>  		DBG(("%s: connector[%d] = %d\n", __FUNCTION__, i,
> connectors[i]));
>  		for (j = 0; j < sna->mode.num_real_output; j++) {
> @@ -5113,13 +5109,10 @@ void sna_mode_discover(struct sna *sna, bool
> tell)
>  			continue;
>  
>  		if (sna_output->serial == serial) {
> -			if (output_check_status(sna, sna_output)) {
> -				DBG(("%s: output %s (id=%d),
> retained state\n",
> -				     __FUNCTION__, output->name,
> sna_output->id));
> -				sna_output->last_detect = now;
> -			} else {
> -				DBG(("%s: output %s (id=%d), changed
> state, reprobing\n",
> -				     __FUNCTION__, output->name,
> sna_output->id));
> +			if (!output_check_status(sna, sna_output)) {
> +				DBG(("%s: output %s (id=%d), changed
> state, reprobing]\n",
> +				     __FUNCTION__, output->name,
> sna_output->id,
> +				     sna_output->serial, serial));
>  				sna_output->last_detect = 0;
>  				changed |= 4;
>  			}
-- 
Cheers,
	Lyude

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