Hi Marek,
20. 9. 4. 오후 4:28에 Marek Szyprowski 이(가) 쓴 글:
> Hi Robin,
>
> On 03.09.2020 22:51, Robin Murphy wrote:
>> Since commit 9495b7e92f71 ("driver core: platform: Initialize dma_parms
>> for platform devices"), struct platform_device already provides a
>> dma_parms structure, so we can save allocating another one.
>>
>> Also the DMA segment size is simply a size, not a bitmask.
>>
>> Signed-off-by: Robin Murphy <robin.mur...@arm.com>
>
> I've sent a similar patch over 2 months ago, but it looks it got lost:
>
> https://lore.kernel.org/dri-devel/20200707110827.3760-1-m.szyprow...@samsung.com/
>
> Inki, could You queue it for merge?
Oops, sorry. Reviewed already but forgot to merge.
Thanks,
Inki Dae
>
>> ---
>> drivers/gpu/drm/exynos/exynos_drm_dma.c | 26 +------------------------
>> 1 file changed, 1 insertion(+), 25 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dma.c
>> b/drivers/gpu/drm/exynos/exynos_drm_dma.c
>> index 58b89ec11b0e..9f25a5ebbf7d 100644
>> --- a/drivers/gpu/drm/exynos/exynos_drm_dma.c
>> +++ b/drivers/gpu/drm/exynos/exynos_drm_dma.c
>> @@ -31,23 +31,6 @@
>> #define EXYNOS_DEV_ADDR_START 0x20000000
>> #define EXYNOS_DEV_ADDR_SIZE 0x40000000
>>
>> -static inline int configure_dma_max_seg_size(struct device *dev)
>> -{
>> - if (!dev->dma_parms)
>> - dev->dma_parms = kzalloc(sizeof(*dev->dma_parms), GFP_KERNEL);
>> - if (!dev->dma_parms)
>> - return -ENOMEM;
>> -
>> - dma_set_max_seg_size(dev, DMA_BIT_MASK(32));
>> - return 0;
>> -}
>> -
>> -static inline void clear_dma_max_seg_size(struct device *dev)
>> -{
>> - kfree(dev->dma_parms);
>> - dev->dma_parms = NULL;
>> -}
>> -
>> /*
>> * drm_iommu_attach_device- attach device to iommu mapping
>> *
>> @@ -69,9 +52,7 @@ static int drm_iommu_attach_device(struct drm_device
>> *drm_dev,
>> return -EINVAL;
>> }
>>
>> - ret = configure_dma_max_seg_size(subdrv_dev);
>> - if (ret)
>> - return ret;
>> + dma_set_max_seg_size(subdrv_dev, UINT_MAX);
>>
>> if (IS_ENABLED(CONFIG_ARM_DMA_USE_IOMMU)) {
>> /*
>> @@ -89,9 +70,6 @@ static int drm_iommu_attach_device(struct drm_device
>> *drm_dev,
>> ret = iommu_attach_device(priv->mapping, subdrv_dev);
>> }
>>
>> - if (ret)
>> - clear_dma_max_seg_size(subdrv_dev);
>> -
>> return ret;
>> }
>>
>> @@ -114,8 +92,6 @@ static void drm_iommu_detach_device(struct drm_device
>> *drm_dev,
>> arm_iommu_attach_device(subdrv_dev, *dma_priv);
>> } else if (IS_ENABLED(CONFIG_IOMMU_DMA))
>> iommu_detach_device(priv->mapping, subdrv_dev);
>> -
>> - clear_dma_max_seg_size(subdrv_dev);
>> }
>>
>> int exynos_drm_register_dma(struct drm_device *drm, struct device *dev,
>
> Best regards
>
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