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From: Stefan Agner <stefan@agner.ch>
To: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Marek Vasut <marex@denx.de>,
	kernel@pengutronix.de, dri-devel@lists.freedesktop.org,
	linux-imx@nxp.com
Subject: Re: [PATCH 12/21] drm: mxsfb: Move vblank event arm to CRTC .atomic_flush()
Date: Mon, 23 Mar 2020 23:38:41 +0100
Message-ID: <ae03781156d1091bf234003a960c3cd5@agner.ch> (raw)
In-Reply-To: <20200309195216.31042-13-laurent.pinchart@ideasonboard.com>

On 2020-03-09 20:52, Laurent Pinchart wrote:
> The vblank event is armed in the plane .atomic_update(). This works fine
> as we have a single plane, but will break as soon as multiple planes are
> supported (not to mention it's logically the wrong place to perform the
> operation). Move it to CRTC .atomic_flush().

The comment in the bracket make it sound as if there was something wrong
with the code before, but from what I understand that was just fine and
the only option we had with drm_simple_kms_helper, correct? Can you
maybe make that a bit clearer? (e.g. by stating that now that we no
longer use the simple display pipeline we can and should use the flush
callback).

Otherwise looks good.

Reviewed-by: Stefan Agner <stefan@agner.ch>

--
Stefan

> 
> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
>  drivers/gpu/drm/mxsfb/mxsfb_kms.c | 35 ++++++++++++++++++-------------
>  1 file changed, 20 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> index 8f339adb8d04..ebe0785694cb 100644
> --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
> @@ -295,6 +295,25 @@ static int mxsfb_crtc_atomic_check(struct drm_crtc *crtc,
>  	return drm_atomic_add_affected_planes(state->state, crtc);
>  }
>  
> +static void mxsfb_crtc_atomic_flush(struct drm_crtc *crtc,
> +				    struct drm_crtc_state *old_state)
> +{
> +	struct drm_pending_vblank_event *event;
> +
> +	event = crtc->state->event;
> +	crtc->state->event = NULL;
> +
> +	if (!event)
> +		return;
> +
> +	spin_lock_irq(&crtc->dev->event_lock);
> +	if (drm_crtc_vblank_get(crtc) == 0)
> +		drm_crtc_arm_vblank_event(crtc, event);
> +	else
> +		drm_crtc_send_vblank_event(crtc, event);
> +	spin_unlock_irq(&crtc->dev->event_lock);
> +}
> +
>  static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
>  				     struct drm_crtc_state *old_state)
>  {
> @@ -364,6 +383,7 @@ static void mxsfb_crtc_disable_vblank(struct drm_crtc *crtc)
>  
>  static const struct drm_crtc_helper_funcs mxsfb_crtc_helper_funcs = {
>  	.atomic_check = mxsfb_crtc_atomic_check,
> +	.atomic_flush = mxsfb_crtc_atomic_flush,
>  	.atomic_enable = mxsfb_crtc_atomic_enable,
>  	.atomic_disable = mxsfb_crtc_atomic_disable,
>  };
> @@ -410,23 +430,8 @@ static void mxsfb_plane_atomic_update(struct
> drm_plane *plane,
>  				      struct drm_plane_state *old_pstate)
>  {
>  	struct mxsfb_drm_private *mxsfb = to_mxsfb_drm_private(plane->dev);
> -	struct drm_crtc *crtc = &mxsfb->crtc;
> -	struct drm_pending_vblank_event *event;
>  	dma_addr_t paddr;
>  
> -	spin_lock_irq(&crtc->dev->event_lock);
> -	event = crtc->state->event;
> -	if (event) {
> -		crtc->state->event = NULL;
> -
> -		if (drm_crtc_vblank_get(crtc) == 0) {
> -			drm_crtc_arm_vblank_event(crtc, event);
> -		} else {
> -			drm_crtc_send_vblank_event(crtc, event);
> -		}
> -	}
> -	spin_unlock_irq(&crtc->dev->event_lock);
> -
>  	paddr = mxsfb_get_fb_paddr(mxsfb);
>  	if (paddr) {
>  		mxsfb_enable_axi_clk(mxsfb);
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  reply index

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-09 19:51 [PATCH 00/21] drm: mxsfb: Add i.MX7 support Laurent Pinchart
2020-03-09 19:51 ` [PATCH 01/21] drm: mxsfb: Remove fbdev leftovers Laurent Pinchart
2020-03-23 20:23   ` Stefan Agner
2020-03-09 19:51 ` [PATCH 02/21] drm: mxsfb: Use drm_panel_bridge Laurent Pinchart
2020-03-23 21:27   ` Stefan Agner
2020-03-23 21:38     ` Sam Ravnborg
2020-03-23 23:50       ` Stefan Agner
2020-05-30  2:14     ` Laurent Pinchart
2020-06-02 13:12       ` Daniel Vetter
2020-06-02 14:34         ` Stefan Agner
2020-06-02 17:18           ` Laurent Pinchart
2020-06-02 17:13         ` Laurent Pinchart
2020-06-03  8:16           ` Daniel Vetter
2020-06-04 20:10             ` Sam Ravnborg
2020-03-09 19:51 ` [PATCH 03/21] drm: mxsfb: Use BIT() macro to define register bitfields Laurent Pinchart
2020-03-23 21:34   ` Stefan Agner
2020-03-09 19:51 ` [PATCH 04/21] drm: mxsfb: Remove unused macros from mxsfb_regs.h Laurent Pinchart
2020-03-23 21:36   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 05/21] drm: mxsfb: Clarify format and bus width configuration Laurent Pinchart
2020-03-23 21:42   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 06/21] drm: mxsfb: Pass mxsfb_drm_private pointer to mxsfb_reset_block() Laurent Pinchart
2020-03-23 21:43   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 07/21] drm: mxsfb: Use LCDC_CTRL register name explicitly Laurent Pinchart
2020-03-23 21:48   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 08/21] drm: mxsfb: Remove register definitions from mxsfb_crtc.c Laurent Pinchart
2020-03-23 21:49   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 09/21] drm: mxsfb: Remove unneeded includes Laurent Pinchart
2020-03-23 21:53   ` Stefan Agner
2020-05-30  0:33     ` Laurent Pinchart
2020-03-09 19:52 ` [PATCH 10/21] drm: mxsfb: Stop using DRM simple display pipeline helper Laurent Pinchart
2020-03-23 22:30   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 11/21] drm: mxsfb: Rename mxsfb_crtc.c to mxsfb_kms.c Laurent Pinchart
2020-03-23 22:31   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 12/21] drm: mxsfb: Move vblank event arm to CRTC .atomic_flush() Laurent Pinchart
2020-03-23 22:38   ` Stefan Agner [this message]
2020-03-09 19:52 ` [PATCH 13/21] drm: mxsfb: Don't touch AXI clock in IRQ context Laurent Pinchart
2020-03-23 22:50   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 14/21] drm: mxsfb: Enable vblank handling Laurent Pinchart
2020-03-23 23:08   ` Stefan Agner
2020-03-24 10:37     ` Stefan Agner
2020-03-09 19:52 ` [PATCH 15/21] drm: mxsfb: Remove mxsfb_devdata unused fields Laurent Pinchart
2020-03-23 23:15   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 16/21] drm: mxsfb: Add i.MX7 to the list of supported SoCs in Kconfig Laurent Pinchart
2020-03-10 16:28   ` Fabio Estevam
2020-03-10 16:32     ` Laurent Pinchart
2020-03-10 16:37       ` [PATCH v1.1 " Laurent Pinchart
2020-03-23 23:18   ` [PATCH " Stefan Agner
2020-03-09 19:52 ` [PATCH 17/21] drm: mxsfb: Update internal IP version number for i.MX6SX Laurent Pinchart
2020-03-23 23:20   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 18/21] drm: mxsfb: Drop non-OF support Laurent Pinchart
2020-03-23 23:23   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 19/21] drm: mxsfb: Turn mxsfb_set_pixel_fmt() into a void function Laurent Pinchart
2020-03-23 23:28   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 20/21] drm: mxsfb: Merge mxsfb_set_pixel_fmt() and mxsfb_set_bus_fmt() Laurent Pinchart
2020-03-23 23:34   ` Stefan Agner
2020-03-09 19:52 ` [PATCH 21/21] drm: mxsfb: Support the alpha plane Laurent Pinchart
2020-03-23 23:48   ` Stefan Agner
2020-05-30  2:44     ` Laurent Pinchart
2020-03-19  9:36 ` [PATCH 00/21] drm: mxsfb: Add i.MX7 support Laurent Pinchart
2020-04-12 16:37 ` Guido Günther
2020-05-26 15:13 ` Stefan Agner
2020-05-30  0:29   ` Laurent Pinchart

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