From: Robin Murphy <robin.murphy@arm.com>
Date: Thu, 3 Sep 2020 13:59:23 +0000 (+0100)
Subject: drm/panfrost: Set DMA max segment size
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=ac5037afefd33fea9a9c1a4a5ac46ece396e7465;p=linux.git

drm/panfrost: Set DMA max segment size

Since all we do with scatterlists is map them in the MMU, we don't have
any hardware constraints on how they're laid out. Let the DMA layer know
so it won't warn when DMA API debugging is enabled.

Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Reviewed-by: Steven Price <steven.price@arm.com>
Signed-off-by: Steven Price <steven.price@arm.com>
Link: https://patchwork.freedesktop.org/patch/msgid/04371bc36512076b7feee07f854e56b80675d953.1599141563.git.robin.murphy@arm.com
---

diff --git a/drivers/gpu/drm/panfrost/panfrost_gpu.c b/drivers/gpu/drm/panfrost/panfrost_gpu.c
index e0f190e438139..eea049c640a67 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gpu.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gpu.c
@@ -344,6 +344,7 @@ int panfrost_gpu_init(struct panfrost_device *pfdev)
 
 	dma_set_mask_and_coherent(pfdev->dev,
 		DMA_BIT_MASK(FIELD_GET(0xff00, pfdev->features.mmu_features)));
+	dma_set_max_seg_size(pfdev->dev, UINT_MAX);
 
 	irq = platform_get_irq_byname(to_platform_device(pfdev->dev), "gpu");
 	if (irq <= 0)