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UPSTREAM: drm/tegra: dc: Inherit DMA mask

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Inherit the DMA mask from host1x (on Tegra210 and earlier) or the
display hub (on Tegra186 and later). This is necessary in order to
properly map buffers without SMMU support and use the maximum IOVA
space available with SMMU support.

Change-Id: Id1be7d4e05b611ee29581b5ea61f0f40c1d296b1
Signed-off-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nvidia/+/2545940
Reviewed-by: svc_kernel_abi <svc_kernel_abi@nvidia.com>
Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
GVS: Gerrit_Virtual_Submit
This commit is contained in:
Thierry Reding
2021-03-26 15:51:32 +01:00
committed by Laxman Dewangan
parent 84c0b7be41
commit efed2371e4
2 changed files with 14 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/tegra/hub.c
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@@ -870,12 +870,19 @@ static const struct host1x_client_ops tegra_display_hub_ops = {
static int tegra_display_hub_probe(struct platform_device *pdev)
{
u64 dma_mask = dma_get_mask(pdev->dev.parent);
struct device_node *child = NULL;
struct tegra_display_hub *hub;
struct clk *clk;
unsigned int i;
int err;
err = dma_coerce_mask_and_coherent(&pdev->dev, dma_mask);
if (err < 0) {
dev_err(&pdev->dev, "failed to set DMA mask: %d\n", err);
return err;
}
hub = devm_kzalloc(&pdev->dev, sizeof(*hub), GFP_KERNEL);
if (!hub)
return -ENOMEM;