linux-kernel - Re: [PATCH 06/15] drm/rockchip: vop: limit resolution width to 3840

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <HE1PR06MB40113EDB12EB739D19AB225FAC3C0@HE1PR06MB4011.eurprd06.prod.outlook.com>
Date:   Mon, 6 Jan 2020 21:34:09 +0000
From:   Jonas Karlman <jonas@...boo.se>
To:     Heiko Stübner <heiko@...ech.de>
CC:     Sandy Huang <hjc@...k-chips.com>,
        Kishon Vijay Abraham I <kishon@...com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Zheng Yang <zhengyang@...k-chips.com>,
        "linux-rockchip@...ts.infradead.org" 
        <linux-rockchip@...ts.infradead.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/15] drm/rockchip: vop: limit resolution width to 3840

On 2020-01-06 22:18, Heiko Stübner wrote:
> Hi Jonas,
>
> Am Montag, 6. Januar 2020, 21:48:25 CET schrieb Jonas Karlman:
>> Using a destination width that is more then 3840 pixels
>> is not supported in scl_vop_cal_scl_fac().
>>
>> Work around this limitation by filtering all modes with
>> a width above 3840 pixels.
> could you try to send the whole series to people? I only get this patch6
> of a series of 15 and that is way confusing not knowing what you want
> to actually achieve.

Very strange, you are the recipient of all patches, and they where delivered to
patchworks at [1] and [2], I also have a copy of this series at [3].

This is part of a series for adding support for more HDMI modes on the RK3228/RK3328.
Also preparation for adding bus format negotiation for YUV420 and 10-bit output mode,
early bus format work is located at [4].

[1] https://patchwork.kernel.org/cover/11320061/
[2] https://patchwork.freedesktop.org/series/71675/
[3] https://github.com/Kwiboo/linux-rockchip/commits/next-20200106-inno-hdmi-phy
[4] https://github.com/Kwiboo/linux-rockchip/commits/next-20200106-bus-format

>
> Hence I can also just point to rk3229, rk3328, rk3368 and rk3399 that
> report a max output of 4096x2160 , which would be larger than that
> 3840 value?

Currently the scaling code in rockchip drm driver is limiting the use of large framebuffers at [5].
This scaling limitation made it impossible for me to use any 4096x mode that my TV supports.

if (dst_w > 3840) {
    DRM_DEV_ERROR(vop->dev, "Maximum dst width (3840) exceeded\n");

[5] https://github.com/torvalds/linux/blob/master/drivers/gpu/drm/rockchip/rockchip_drm_vop.c#L329-L332

Regards,
Jonas

>
>
> Heiko
>
>
>> Signed-off-by: Jonas Karlman <jonas@...boo.se>
>> ---
>>  drivers/gpu/drm/rockchip/rockchip_drm_vop.c | 10 ++++++++++
>>  1 file changed, 10 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> index d04b3492bdac..f181897cbfad 100644
>> --- a/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> +++ b/drivers/gpu/drm/rockchip/rockchip_drm_vop.c
>> @@ -1036,6 +1036,15 @@ static void vop_crtc_disable_vblank(struct drm_crtc *crtc)
>>  	spin_unlock_irqrestore(&vop->irq_lock, flags);
>>  }
>>  
>> +enum drm_mode_status vop_crtc_mode_valid(struct drm_crtc *crtc,
>> +					 const struct drm_display_mode *mode)
>> +{
>> +	if (mode->hdisplay > 3840)
>> +		return MODE_BAD_HVALUE;
>> +
>> +	return MODE_OK;
>> +}
>> +
>>  static bool vop_crtc_mode_fixup(struct drm_crtc *crtc,
>>  				const struct drm_display_mode *mode,
>>  				struct drm_display_mode *adjusted_mode)
>> @@ -1377,6 +1386,7 @@ static void vop_crtc_atomic_flush(struct drm_crtc *crtc,
>>  }
>>  
>>  static const struct drm_crtc_helper_funcs vop_crtc_helper_funcs = {
>> +	.mode_valid = vop_crtc_mode_valid,
>>  	.mode_fixup = vop_crtc_mode_fixup,
>>  	.atomic_check = vop_crtc_atomic_check,
>>  	.atomic_begin = vop_crtc_atomic_begin,
>>