On Thu, Apr 04, 2019 at 11:08:04AM +0100, Lowry Li (Arm Technology China) wrote: > Fixing the DMA mapping sg segment warning, which shows "DMA-API: mapping > sg segment longer than device claims to support [len=921600] [max=65536]". > Fixed by setting the max segment size at Komeda driver. > > This patch depends on: > - https://patchwork.freedesktop.org/series/54448/ > - https://patchwork.freedesktop.org/series/54449/ > - https://patchwork.freedesktop.org/series/54450/ > - https://patchwork.freedesktop.org/series/58976/ > > Changes since v1: > - Adds member description > - Adds patch denpendency in the comment > > Signed-off-by: Lowry Li (Arm Technology China) <lowry...@arm.com> > --- > drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 4 ++++ > drivers/gpu/drm/arm/display/komeda/komeda_dev.h | 2 ++ > 2 files changed, 6 insertions(+) > > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c > b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c > index 7f25e6a..b4902ae 100644 > --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.c > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.c > @@ -8,6 +8,7 @@ > #include <linux/of_device.h> > #include <linux/of_graph.h> > #include <linux/platform_device.h> > +#include <linux/dma-iommu.h> > #ifdef CONFIG_DEBUG_FS > #include <linux/debugfs.h> > #include <linux/seq_file.h> > @@ -245,6 +246,9 @@ struct komeda_dev *komeda_dev_create(struct device *dev) > goto err_cleanup; > } > > + dev->dma_parms = &mdev->dma_parms; > + dma_set_max_seg_size(dev, DMA_BIT_MASK(32)); > + > err = sysfs_create_group(&dev->kobj, &komeda_sysfs_attr_group); > if (err) { > DRM_ERROR("create sysfs group failed.\n"); > diff --git a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h > b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h > index 29e03c4..83ace71 100644 > --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h > @@ -149,6 +149,8 @@ struct komeda_dev { > struct device *dev; > /** @reg_base: the base address of komeda io space */ > u32 __iomem *reg_base; > + /** @dma_parms: the dma parameters of komeda */ > + struct device_dma_parameters dma_parms; > > /** @chip: the basic chip information */ > struct komeda_chip_info chip; > -- > 1.9.1
lgtm Reviewed-by: Ayan Kumar Halder <ayan.hal...@arm.com>
