When we communicate with the VideoCore to perform property mailbox transactions, that is a DMA operation as far as the property buffer is concerned. Use phys_to_bus() on that buffer.
Signed-off-by: Stephen Warren swarren@wwwdotorg.org --- While this isn't USB-related, it does depend on patches that went into the USB topic/dwc2 tree. Either this can be merged there, or we'll have to wait until that branch is merged into u-boot/master and then merge this.
As best I can tell, this is the last place we need to do this. SDHCI has potential but CONFIG_MMC_SDMA isn't set so I don't believe the code does any DMA. LCD has potential, but the VideoCore allocates the display surface, programs the display engine, and passes the surface's CPU pointer back to the CPU in a firmware message, of U-Boot isn't involved in setting up the DMA HW. --- arch/arm/cpu/arm1176/bcm2835/mbox.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm/cpu/arm1176/bcm2835/mbox.c b/arch/arm/cpu/arm1176/bcm2835/mbox.c index 3b17a31eacfd..1af9be78c68a 100644 --- a/arch/arm/cpu/arm1176/bcm2835/mbox.c +++ b/arch/arm/cpu/arm1176/bcm2835/mbox.c @@ -7,6 +7,7 @@ #include <common.h> #include <asm/io.h> #include <asm/arch/mbox.h> +#include <phys2bus.h>
#define TIMEOUT 1000 /* ms */
@@ -110,10 +111,10 @@ int bcm2835_mbox_call_prop(u32 chan, struct bcm2835_mbox_hdr *buffer) dump_buf(buffer); #endif
- ret = bcm2835_mbox_call_raw(chan, (u32)buffer, &rbuffer); + ret = bcm2835_mbox_call_raw(chan, phys_to_bus((u32)buffer), &rbuffer); if (ret) return ret; - if (rbuffer != (u32)buffer) { + if (rbuffer != phys_to_bus((u32)buffer)) { printf("mbox: Response buffer mismatch\n"); return -1; }