On 6/15/2015 4:00 PM, Daniel Vetter wrote:
On Mon, Jun 01, 2015 at 02:03:15PM +0300, Ville Syrjälä wrote:
On Fri, May 29, 2015 at 07:10:53PM +0200, Daniel Vetter wrote:
On Fri, May 29, 2015 at 01:59:01PM +0300, Ville Syrjälä wrote:
On Fri, May 29, 2015 at 04:06:53PM +0530, Gaurav K Singh wrote:
Allocate gem memory for MIPI DBI command buffer. This memory
will be used when sending command via DBI interface.
Why would you allocate this via gem? AFAICS you only feed the bus
address to the hardware. Using the dma-api would seem like the right
choice here, but I'm not sure how to deal with the dma mask.
Yeah dma_alloc_coherent is what you want here. The mask can be ignored,
it should be suitable already.
Umm, this thing seems to limited to 32bit addresses. And we set the mask
to 39 or 40 bits depending on the gen.
Well that's what we have dma_set_coherent_mask for, hooray. Not the first
one, see the other hacks with comments in i915_driver_load.
-Daniel
checking on the usage of dma_alloc_coherent. Will come back on this.
With regards,
Gaurav
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