6.6-stable review patch. If anyone has any objections, please let me know.
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From: Laurent Pinchart laurent.pinchart@ideasonboard.com
[ Upstream commit df518a0ae1b982a4dcf2235464016c0c4576a34d ]
The buffer used to transfer data over the mailbox interface is mapped using the client's device. This is incorrect, as the device performing the DMA transfer is the mailbox itself. Fix it by using the mailbox controller device instead.
This requires including the mailbox_controller.h header to dereference the mbox_chan and mbox_controller structures. The header is not meant to be included by clients. This could be fixed by extending the client API with a function to access the controller's device.
Fixes: 4e3d60656a72 ("ARM: bcm2835: Add the Raspberry Pi firmware driver") Signed-off-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Stefan Wahren wahrenst@gmx.net Tested-by: Ivan T. Ivanov iivanov@suse.de Link: https://lore.kernel.org/r/20240326195807.15163-3-laurent.pinchart@ideasonboa... Signed-off-by: Florian Fainelli florian.fainelli@broadcom.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/firmware/raspberrypi.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/firmware/raspberrypi.c b/drivers/firmware/raspberrypi.c index f66efaa5196d9..428ae54d3196c 100644 --- a/drivers/firmware/raspberrypi.c +++ b/drivers/firmware/raspberrypi.c @@ -9,6 +9,7 @@ #include <linux/dma-mapping.h> #include <linux/kref.h> #include <linux/mailbox_client.h> +#include <linux/mailbox_controller.h> #include <linux/module.h> #include <linux/of.h> #include <linux/of_platform.h> @@ -97,8 +98,8 @@ int rpi_firmware_property_list(struct rpi_firmware *fw, if (size & 3) return -EINVAL;
- buf = dma_alloc_coherent(fw->cl.dev, PAGE_ALIGN(size), &bus_addr, - GFP_ATOMIC); + buf = dma_alloc_coherent(fw->chan->mbox->dev, PAGE_ALIGN(size), + &bus_addr, GFP_ATOMIC); if (!buf) return -ENOMEM;
@@ -126,7 +127,7 @@ int rpi_firmware_property_list(struct rpi_firmware *fw, ret = -EINVAL; }
- dma_free_coherent(fw->cl.dev, PAGE_ALIGN(size), buf, bus_addr); + dma_free_coherent(fw->chan->mbox->dev, PAGE_ALIGN(size), buf, bus_addr);
return ret; }