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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 14/21] drm: mxsfb: Enable vblank handling
Date: Tue, 24 Mar 2020 11:37:17 +0100
Message-ID: <513a90d4310053fc0892ad9e45fd1a3b@agner.ch> (raw)
In-Reply-To: <c6a1ff930152e17b61ec9e032fa7e4cb@agner.ch>

On 2020-03-24 00:08, Stefan Agner wrote:
> On 2020-03-09 20:52, Laurent Pinchart wrote:
>> Enable vblank handling when the CRTC is turned on and disable it when it
>> is turned off. This requires moving vblank init after the KMS pipeline
>> initialisation, otherwise drm_vblank_init() gets called with 0 CRTCs.
>>
>> Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> 
> With this patch applied I start to get system resets on my Colibri iMX7
> test device during system boot shortly after initializing mxsfb. It
> happens not on every boot, but rather often, I would say every second or
> third. From what I can tell the interrupt handling should be safe, but
> it seems that every now and then something races. Any idea what that
> could be?

Disregard this: It seems that my power supply was a bit too weak which
lead to the system reset every now and then. With enough juice, I run
now quite some boots with the complete patchset applied without seeing
any issues.

Sorry about that.

--
Stefan

> 
> --
> Stefan
> 
>> ---
>>  drivers/gpu/drm/mxsfb/mxsfb_drv.c | 15 +++++++++------
>>  drivers/gpu/drm/mxsfb/mxsfb_kms.c |  6 +++++-
>>  2 files changed, 14 insertions(+), 7 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
>> b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
>> index e324bd2a63a5..72b4f6a947a4 100644
>> --- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
>> +++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
>> @@ -160,12 +160,6 @@ static int mxsfb_load(struct drm_device *drm,
>> unsigned long flags)
>>
>>  	pm_runtime_enable(drm->dev);
>>
>> -	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
>> -	if (ret < 0) {
>> -		dev_err(drm->dev, "Failed to initialise vblank\n");
>> -		goto err_vblank;
>> -	}
>> -
>>  	/* Modeset init */
>>  	drm_mode_config_init(drm);
>>
>> @@ -175,6 +169,15 @@ static int mxsfb_load(struct drm_device *drm,
>> unsigned long flags)
>>  		goto err_vblank;
>>  	}
>>
>> +	ret = drm_vblank_init(drm, drm->mode_config.num_crtc);
>> +	if (ret < 0) {
>> +		dev_err(drm->dev, "Failed to initialise vblank\n");
>> +		goto err_vblank;
>> +	}
>> +
>> +	/* Start with vertical blanking interrupt reporting disabled. */
>> +	drm_crtc_vblank_off(&mxsfb->crtc);
>> +
>>  	ret = mxsfb_attach_bridge(mxsfb);
>>  	if (ret) {
>>  		dev_err(drm->dev, "Cannot connect bridge: %d\n", ret);
>> diff --git a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
>> b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
>> index ac2696c8483d..640305fb1068 100644
>> --- a/drivers/gpu/drm/mxsfb/mxsfb_kms.c
>> +++ b/drivers/gpu/drm/mxsfb/mxsfb_kms.c
>> @@ -322,8 +322,10 @@ static void mxsfb_crtc_atomic_enable(struct drm_crtc *crtc,
>>  	dma_addr_t paddr;
>>
>>  	pm_runtime_get_sync(drm->dev);
>> -
>>  	mxsfb_enable_axi_clk(mxsfb);
>> +
>> +	drm_crtc_vblank_on(crtc);
>> +
>>  	mxsfb_crtc_mode_set_nofb(mxsfb);
>>
>>  	/* Write cur_buf as well to avoid an initial corrupt frame */
>> @@ -353,6 +355,8 @@ static void mxsfb_crtc_atomic_disable(struct drm_crtc *crtc,
>>  	}
>>  	spin_unlock_irq(&drm->event_lock);
>>
>> +	drm_crtc_vblank_off(crtc);
>> +
>>  	mxsfb_disable_axi_clk(mxsfb);
>>  	pm_runtime_put_sync(drm->dev);
>>  }
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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
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 [this message]
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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