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Message-ID: <20170515155249.uzgqvy4ftpjlkclu@phenom.ffwll.local>
Date: Mon, 15 May 2017 17:52:49 +0200
From: Daniel Vetter <daniel@...ll.ch>
To: Jose Abreu <Jose.Abreu@...opsys.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
Carlos Palminha <CARLOS.PALMINHA@...opsys.com>,
Alexey Brodkin <Alexey.Brodkin@...opsys.com>,
Ville Syrjälä
<ville.syrjala@...ux.intel.com>, Dave Airlie <airlied@...ux.ie>,
Andrzej Hajda <a.hajda@...sung.com>,
Archit Taneja <architt@...eaurora.org>
Subject: Re: [PATCH v3 6/6] drm: arc: Use crtc->mode_valid() callback
On Mon, May 15, 2017 at 10:53:25AM +0200, Daniel Vetter wrote:
> On Thu, May 11, 2017 at 10:06:02AM +0100, Jose Abreu wrote:
> > Now that we have a callback to check if crtc supports a given mode
> > we can use it in arcpgu so that we restrict the number of probbed
> > modes to the ones we can actually display.
> >
> > This is specially useful because arcpgu crtc is responsible to set
> > a clock value in the commit() stage but unfortunatelly this clock
> > does not support all the needed ranges.
> >
> > Also, remove the atomic_check() callback as mode_valid() callback
> > will be called before.
> >
> > Signed-off-by: Jose Abreu <joabreu@...opsys.com>
> > Cc: Carlos Palminha <palminha@...opsys.com>
> > Cc: Alexey Brodkin <abrodkin@...opsys.com>
> > Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> > Cc: Daniel Vetter <daniel.vetter@...ll.ch>
> > Cc: Dave Airlie <airlied@...ux.ie>
> > Cc: Andrzej Hajda <a.hajda@...sung.com>
> > Cc: Archit Taneja <architt@...eaurora.org>
>
> Btw for justifying your patch series a bit more, would be real sweet to
> roll ->mode_valid out to more drivers. I see two easy cases:
>
> bridge/analogix-anx78xx.c: has a simple mode_fixup which really is just a
> mode_valid callback
>
> bridge/synopsys/dw-hdmi.c: simply hand-rolls what you've done here, we
> could move the connector_mode valid to the bridge and done.
>
> Care to type these 2 patches on top, just to make this a bit more useful
> and a clearer case for merging?
Aside: There's a pile more drivers (encoders and crtc drivers) which would
similarly benefit and dont really look like they'd be hard to patch up:
- malidp_crtc_mode_fixup
- armada_drm_crtc_mode_fixup (armada isn't atomic, so forget this one)
- atmel_hlcdc_crtc_mode_fixup
- hdmi_mode_fixup in exynos_hdmi.c
- vc4_crtc_mode_fixup and vc4_dpi_encoder_mode_fixup (they both just check
for interlaced modes, we could probably dump the same check in
connector->mode_valid).
Plus the 2 bridge drivers. Everyone else does either something more
complex, or something that's not quite correct.
-Daniel
>
> Thanks, Daniel
>
> > ---
> > drivers/gpu/drm/arc/arcpgu_crtc.c | 39 ++++++++++++++++++++++++---------------
> > 1 file changed, 24 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/arc/arcpgu_crtc.c b/drivers/gpu/drm/arc/arcpgu_crtc.c
> > index ad9a959..01cae0a 100644
> > --- a/drivers/gpu/drm/arc/arcpgu_crtc.c
> > +++ b/drivers/gpu/drm/arc/arcpgu_crtc.c
> > @@ -32,6 +32,18 @@
> > { "r8g8b8", 24, {16, 8}, {8, 8}, {0, 8}, {0, 0}, DRM_FORMAT_RGB888 },
> > };
> >
> > +static bool arc_pgu_is_mode_valid(struct arcpgu_drm_private *arcpgu,
> > + const struct drm_display_mode *mode)
> > +{
> > + long rate, clk_rate = mode->clock * 1000;
> > +
> > + rate = clk_round_rate(arcpgu->clk, clk_rate);
> > + if (rate != clk_rate)
> > + return false;
> > +
> > + return true;
> > +}
> > +
> > static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
> > {
> > struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
> > @@ -64,6 +76,17 @@ static void arc_pgu_set_pxl_fmt(struct drm_crtc *crtc)
> > .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
> > };
> >
> > +enum drm_mode_status arc_pgu_crtc_mode_valid(struct drm_crtc *crtc,
> > + const struct drm_display_mode *mode)
> > +{
> > + struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
> > +
> > + if (!arc_pgu_is_mode_valid(arcpgu, mode))
> > + return MODE_NOCLOCK;
> > +
> > + return MODE_OK;
> > +}
> > +
> > static void arc_pgu_crtc_mode_set_nofb(struct drm_crtc *crtc)
> > {
> > struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
> > @@ -129,20 +152,6 @@ static void arc_pgu_crtc_disable(struct drm_crtc *crtc)
> > ~ARCPGU_CTRL_ENABLE_MASK);
> > }
> >
> > -static int arc_pgu_crtc_atomic_check(struct drm_crtc *crtc,
> > - struct drm_crtc_state *state)
> > -{
> > - struct arcpgu_drm_private *arcpgu = crtc_to_arcpgu_priv(crtc);
> > - struct drm_display_mode *mode = &state->adjusted_mode;
> > - long rate, clk_rate = mode->clock * 1000;
> > -
> > - rate = clk_round_rate(arcpgu->clk, clk_rate);
> > - if (rate != clk_rate)
> > - return -EINVAL;
> > -
> > - return 0;
> > -}
> > -
> > static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
> > struct drm_crtc_state *state)
> > {
> > @@ -158,6 +167,7 @@ static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
> > }
> >
> > static const struct drm_crtc_helper_funcs arc_pgu_crtc_helper_funcs = {
> > + .mode_valid = arc_pgu_crtc_mode_valid,
> > .mode_set = drm_helper_crtc_mode_set,
> > .mode_set_base = drm_helper_crtc_mode_set_base,
> > .mode_set_nofb = arc_pgu_crtc_mode_set_nofb,
> > @@ -165,7 +175,6 @@ static void arc_pgu_crtc_atomic_begin(struct drm_crtc *crtc,
> > .disable = arc_pgu_crtc_disable,
> > .prepare = arc_pgu_crtc_disable,
> > .commit = arc_pgu_crtc_enable,
> > - .atomic_check = arc_pgu_crtc_atomic_check,
> > .atomic_begin = arc_pgu_crtc_atomic_begin,
> > };
> >
> > --
> > 1.9.1
> >
> >
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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