[Intel-gfx] [PATCH v3 07/10] drm/exynos: Remove custom FB helper deferred setup

[Thierry Reding]

On Tue, Mar 21, 2017 at 11:42:21AM +0100, Andrzej Hajda wrote:
> On 21.03.2017 11:20, Daniel Vetter wrote:
> > On Tue, Mar 21, 2017 at 10:58:43AM +0100, Andrzej Hajda wrote:
> >> On 21.03.2017 09:13, Thierry Reding wrote:
> >>> From: Thierry Reding <treding at nvidia.com>
> >>>
> >>> The FB helper core now supports deferred setup, so the driver's custom
> >>> implementation can be removed.
> >>>
> >>> Signed-off-by: Thierry Reding <treding at nvidia.com>
> >>> ---
> >>>  drivers/gpu/drm/exynos/exynos_drm_drv.c   | 6 ++++--
> >>>  drivers/gpu/drm/exynos/exynos_drm_fbdev.c | 2 --
> >>>  2 files changed, 4 insertions(+), 4 deletions(-)
> >>>
> >>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> >>> index 09d3c4c3c858..c5a37dda8d1b 100644
> >>> --- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
> >>> +++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
> >>> @@ -399,8 +399,9 @@ static int exynos_drm_bind(struct device *dev)
> >>>  	/* init kms poll for handling hpd */
> >>>  	drm_kms_helper_poll_init(drm);
> >>>  
> >>> -	/* force connectors detection */
> >>> -	drm_helper_hpd_irq_event(drm);
> >>> +	ret = exynos_drm_fbdev_init(dev);
> >>> +	if (ret)
> >>> +		goto err_cleanup_poll;
> >> It should be rather:
> >>     ret = exynos_drm_fbdev_init(drm);
> >>
> >> Even with this change it does not work, I will try to track down the
> >> problem.
> 
> The solution was to remove custom equivalent of
> drm_fb_helper_maybe_connected - exynos_drm_fbdev_is_anything_connected,
> it is called earlier and it was a part of custom deferred fbdev.

Cool, thanks for figuring that out. I can add that to this patch for v4.

> > We might need the multi-stage fbdev setup here, i.e. init fbdev, run
> > hpd_irq_event() (I suspect that kicks all the connectors to start
> > probing), then initial_config for fbdev.
> >
> > Probably simplest way to achieve this is to keep the hpd_irq_event call,
> > but place it _after_ the fbdev_init.
> > -Daniel
> 
> I wonder if it wouldn't be sufficient to check if there is anything
> connected, instead of checking if there is anything not-disconnected, in
> drm_fb_helper_maybe_connected.

My recollection is that this had been discussed when I first sent this
out. VGA outputs are somewhat of a special case in that you can't always
properly detect that it's connected or not. So effectively we need to
take into account the connector_status_unknown. There's also some more
information about this in the kerneldoc for enum drm_connector_status.

Thierry
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