linux-kernel - Re: [PATCH v2 0/2] drm/mediatek: make imported PRIME buffers contiguous

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Date:   Thu, 15 Aug 2019 09:40:36 +0800
From:   CK Hu <ck.hu@...iatek.com>
To:     Alexandre Courbot <acourbot@...omium.org>
CC:     Philipp Zabel <p.zabel@...gutronix.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Tomasz Figa <tfiga@...omium.org>,
        <dri-devel@...ts.freedesktop.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/2] drm/mediatek: make imported PRIME buffers
 contiguous

Hi, Alexandre:

On Mon, 2019-07-29 at 14:33 +0900, Alexandre Courbot wrote:
> The default DMA segment size was used when importing PRIME buffers,
> which resulted in a chance of them not being contiguous in the virtual
> IO space of the device and mtk_gem_prime_import_sg_table() complaining
> that the SG table was not contiguous as it expects.
> 
> This series fixes this issue by
> 
> 1) Using the correct DMA device when importing PRIME buffers,
> 2) Setting a more suitable DMA segment size on the DMA device than the
> default 64KB.

For the series, applied to mediatek-drm-fixes-5.3 [1], thanks.

[1]
https://github.com/ckhu-mediatek/linux.git-tags/commits/mediatek-drm-fixes-5.3

> 
> Changes since v1:
> - Split into two patches,
> - Fixed an error path that would have returned 0.
> 
> Alexandre Courbot (2):
>   drm/mediatek: use correct device to import PRIME buffers
>   drm/mediatek: set DMA max segment size
> 
>  drivers/gpu/drm/mediatek/mtk_drm_drv.c | 49 ++++++++++++++++++++++++--
>  drivers/gpu/drm/mediatek/mtk_drm_drv.h |  2 ++
>  2 files changed, 48 insertions(+), 3 deletions(-)
>