On Sunday, April 05, 2015 at 04:48:24 AM, Stephen Warren wrote:
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 +++--
I don't mind picking this up, but please rebase on top of u-boot/master, which contains d6c418e4b8036038505ac67bf5d85a19ca2c650d .
Thanks!
Best regards, Marek Vasut