On Sat, 2016-12-31 at 22:29 +0100, Hans de Goede wrote:
> This makes sense, the iosf_mbi code which is used by the
> i2c bus semaphore code has this:
>
> arch/x86/platform/intel/iosf_mbi.c:
>
> int iosf_mbi_read(u8 port, u8 opcode, u32 offset, u32 *mdr)
> {
> u32 mcr, mcrx;
> unsigned long flags;
> int ret;
>
> /* Access to the GFX unit is handled by GPU code */
> if (port == BT_MBI_UNIT_GFX) {
> WARN_ON(1);
> return -EPERM;
> }
>
> ...
> }
>
> So the i915 driver definitely is interacting with the punit
> through the mailbox interface too...
Yes, they have private mailbox support. Once I talked to Ville to make
at least definitions common between two: iosf_mbi.h and whatever i915 is
using, but have no time to implement that.
--
Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Intel Finland Oy
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