By default on ARM systems, the coherent DMA mask (lowest
address) is set to ~0 or 0xFFFFFFFFFFFFFFFF. Currently,
of_platform_device_create_pdata sets the coherent DMA mask to
32 bits. This prevents coherent dma allocations from working by default
without clients setting the DMA mask. Rather than make every client
on an LPAE system set the mask, set the mask to a 64 bit value on
ARM LPAE systems.
Signed-off-by: Laura Abbott <lau...@codeaurora.org>
---
drivers/of/platform.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/drivers/of/platform.c b/drivers/of/platform.c
index 0970505..18b69c1 100644
--- a/drivers/of/platform.c
+++ b/drivers/of/platform.c
@@ -214,7 +214,11 @@ struct platform_device *of_platform_device_create_pdata(
#if defined(CONFIG_MICROBLAZE)
dev->archdata.dma_mask = 0xffffffffUL;
#endif
+#ifdef CONFIG_ARM_LPAE
+ dev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
+#else
dev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+#endif
dev->dev.bus = &platform_bus_type;
dev->dev.platform_data = platform_data;
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
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