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 _______________________________________________ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
