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

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Message-Id: <20190729053335.251379-1-acourbot@chromium.org>
Date:   Mon, 29 Jul 2019 14:33:33 +0900
From:   Alexandre Courbot <acourbot@...omium.org>
To:     CK Hu <ck.hu@...iatek.com>, 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>
Cc:     dri-devel@...ts.freedesktop.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alexandre Courbot <acourbot@...omium.org>
Subject: [PATCH v2 0/2] drm/mediatek: make imported PRIME buffers contiguous

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.

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(-)

-- 
2.22.0.709.g102302147b-goog