| Message ID | 1553757859-13506-1-git-send-email-lowry.li@arm.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [RFC] drm/komeda: fixing of DMA mapping sg segment warning | expand |
On Thu, Mar 28, 2019 at 07:25:00AM +0000, 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. > > Signed-off-by: Lowry Li <lowry.li@arm.com> > --- > drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 4 ++++ > drivers/gpu/drm/arm/display/komeda/komeda_dev.h | 1 + > 2 files changed, 5 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 0c3e32b..d8cfa92 100644 > --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h > +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h > @@ -146,6 +146,7 @@ enum { > */ > struct komeda_dev { > struct device *dev; > + struct device_dma_parameters dma_parms; > u32 __iomem *reg_base; > > struct komeda_chip_info chip; > -- Please rebase and test your patches on drm-misc-next. https://drm.pages.freedesktop.org/maintainer-tools/repositories.html > 1.9.1
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 0c3e32b..d8cfa92 100644 --- a/drivers/gpu/drm/arm/display/komeda/komeda_dev.h +++ b/drivers/gpu/drm/arm/display/komeda/komeda_dev.h @@ -146,6 +146,7 @@ enum { */ struct komeda_dev { struct device *dev; + struct device_dma_parameters dma_parms; u32 __iomem *reg_base; struct komeda_chip_info chip;
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. Signed-off-by: Lowry Li <lowry.li@arm.com> --- drivers/gpu/drm/arm/display/komeda/komeda_dev.c | 4 ++++ drivers/gpu/drm/arm/display/komeda/komeda_dev.h | 1 + 2 files changed, 5 insertions(+)