From: Paul Cercueil <paul@crapouillou.net>
To: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>,
"H . Nikolaus Schaller" <hns@goldelico.com>,
Paul Boddie <paul@boddie.org.uk>,
list@opendingux.net, Sam Ravnborg <sam@ravnborg.org>,
linux-mips@vger.kernel.org, dri-devel@lists.freedesktop.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH 3/8] drm/ingenic: Use standard drm_atomic_helper_commit_tail
Date: Tue, 10 Aug 2021 12:46:05 +0200 [thread overview]
Message-ID: <TWDMXQ.LWEW6X38G98J@crapouillou.net> (raw)
In-Reply-To: <YRJS9kZt5jUe5Z3r@phenom.ffwll.local>
Hi Daniel,
Le mar., août 10 2021 at 12:20:38 +0200, Daniel Vetter
<daniel@ffwll.ch> a écrit :
> On Sun, Aug 08, 2021 at 03:45:21PM +0200, Paul Cercueil wrote:
>> By making the CRTC's .vblank_enable() function return an error when
>> it
>> is known that the hardware won't deliver a VBLANK, we can drop the
>> ingenic_drm_atomic_helper_commit_tail() function and use the
>> standard
>> drm_atomic_helper_commit_tail() function instead.
>>
>> Signed-off-by: Paul Cercueil <paul@crapouillou.net>
>> ---
>> drivers/gpu/drm/ingenic/ingenic-drm-drv.c | 28
>> ++++-------------------
>> 1 file changed, 4 insertions(+), 24 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> index bc71ba44ccf4..3ed7c27a8dde 100644
>> --- a/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> +++ b/drivers/gpu/drm/ingenic/ingenic-drm-drv.c
>> @@ -706,29 +706,6 @@ static int
>> ingenic_drm_encoder_atomic_check(struct drm_encoder *encoder,
>> }
>> }
>>
>> -static void ingenic_drm_atomic_helper_commit_tail(struct
>> drm_atomic_state *old_state)
>> -{
>> - /*
>> - * Just your regular drm_atomic_helper_commit_tail(), but only
>> calls
>> - * drm_atomic_helper_wait_for_vblanks() if priv->no_vblank.
>> - */
>> - struct drm_device *dev = old_state->dev;
>> - struct ingenic_drm *priv = drm_device_get_priv(dev);
>> -
>> - drm_atomic_helper_commit_modeset_disables(dev, old_state);
>> -
>> - drm_atomic_helper_commit_planes(dev, old_state, 0);
>> -
>> - drm_atomic_helper_commit_modeset_enables(dev, old_state);
>> -
>> - drm_atomic_helper_commit_hw_done(old_state);
>> -
>> - if (!priv->no_vblank)
>> - drm_atomic_helper_wait_for_vblanks(dev, old_state);
>> -
>> - drm_atomic_helper_cleanup_planes(dev, old_state);
>> -}
>> -
>> static irqreturn_t ingenic_drm_irq_handler(int irq, void *arg)
>> {
>> struct ingenic_drm *priv = drm_device_get_priv(arg);
>> @@ -749,6 +726,9 @@ static int ingenic_drm_enable_vblank(struct
>> drm_crtc *crtc)
>> {
>> struct ingenic_drm *priv = drm_crtc_get_priv(crtc);
>>
>> + if (priv->no_vblank)
>> + return -EWOULDBLOCK;
>
> I think other drivers return EINVAL here. I'm not sure exactly this is
> specified, but the errno here is visible to userspace.
>
> Maybe would be good to update the kerneldoc for this hook?
>
> Anyway this is great, with the errno fixed:
>
> Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
I thought about it afterwards, that my error code wasn't great. In my
mind it was "the driver will hang while waiting for vblank" hence
-EWOULDBLOCK ;)
I'll need to v2 anyway so I'll change it to -EINVAL then.
Cheers,
-Paul
>
>> +
>> regmap_update_bits(priv->map, JZ_REG_LCD_CTRL,
>> JZ_LCD_CTRL_EOF_IRQ, JZ_LCD_CTRL_EOF_IRQ);
>>
>> @@ -856,7 +836,7 @@ static const struct drm_mode_config_funcs
>> ingenic_drm_mode_config_funcs = {
>> };
>>
>> static struct drm_mode_config_helper_funcs
>> ingenic_drm_mode_config_helpers = {
>> - .atomic_commit_tail = ingenic_drm_atomic_helper_commit_tail,
>> + .atomic_commit_tail = drm_atomic_helper_commit_tail,
>> };
>>
>> static void ingenic_drm_unbind_all(void *d)
>> --
>> 2.30.2
>>
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
next prev parent reply other threads:[~2021-08-10 10:46 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-08-08 13:45 [PATCH 0/8] gpu/drm: ingenic-drm: Various improvements Paul Cercueil
2021-08-08 13:45 ` [PATCH 1/8] drm/ingenic: Remove dead code Paul Cercueil
2021-08-08 17:58 ` Thomas Zimmermann
2021-08-08 18:27 ` Joe Perches
2021-08-08 18:33 ` Paul Cercueil
2021-08-08 13:45 ` [PATCH 2/8] drm/ingenic: Simplify code by using hwdescs array Paul Cercueil
2021-08-08 18:42 ` Thomas Zimmermann
2021-08-08 22:22 ` Paul Cercueil
2021-08-08 13:45 ` [PATCH 3/8] drm/ingenic: Use standard drm_atomic_helper_commit_tail Paul Cercueil
2021-08-08 19:50 ` Christophe JAILLET
2021-08-08 20:09 ` Paul Cercueil
2021-08-08 20:15 ` Christophe JAILLET
2021-08-10 10:20 ` Daniel Vetter
2021-08-10 10:46 ` Paul Cercueil [this message]
2021-08-08 13:45 ` [PATCH 4/8] drm/ingenic: Add support for private objects Paul Cercueil
2021-08-08 13:45 ` [PATCH 5/8] drm/ingenic: Move IPU scale settings to private state Paul Cercueil
2021-08-08 13:45 ` [PATCH 6/8] drm/ingenic: Set DMA descriptor chain register when starting CRTC Paul Cercueil
2021-08-08 13:45 ` [PATCH 7/8] drm/ingenic: Upload palette before frame Paul Cercueil
2021-08-08 13:45 ` [PATCH 8/8] drm/ingenic: Attach bridge chain to encoders Paul Cercueil
2021-08-08 18:57 ` H. Nikolaus Schaller
2021-08-08 19:04 ` Paul Cercueil
2021-08-08 19:06 ` H. Nikolaus Schaller
2021-08-08 19:12 ` H. Nikolaus Schaller
2021-08-09 11:14 ` [Letux-kernel] " H. Nikolaus Schaller
2021-08-09 16:22 ` Paul Cercueil
2021-08-09 23:17 ` Paul Boddie
2021-08-10 7:52 ` Paul Cercueil
2021-08-10 21:15 ` Paul Boddie
2021-08-10 21:54 ` Paul Cercueil
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