On 2019-09-11 5:20 pm, Will Deacon wrote:

On Wed, Sep 11, 2019 at 06:19:04PM +0200, Neil Armstrong wrote:

quoted

On 11/09/2019 16:42, Robin Murphy wrote:

quoted

Here's the eagerly-awaited fix to unblock T720/T820, plus a couple of
other bits that I've collected so far. I'm not considering this as
5.3 fixes material, but it would be nice if there's any chance still
to sneak it into 5.4.

Robin.


Robin Murphy (3):
   iommu/io-pgtable-arm: Correct Mali attributes
   iommu/io-pgtable-arm: Support more Mali configurations
   iommu/io-pgtable-arm: Allow coherent walks for Mali

  drivers/iommu/io-pgtable-arm.c | 61 ++++++++++++++++++++++++++--------
  1 file changed, 48 insertions(+), 13 deletions(-)

Tested-by: Neil Armstrong <redacted>

On Khadas VIM2 (Amlogic S912) with T820 Mali GPU

I hope this will be part of v5.4 so we can run panfrost on vanilla v5.4 !

Not a chance -- the merge window opens on Monday and -next isn't being
rolled out at the moment due to LPC. Let's shoot for 5.5 and get this
queued up in a few weeks.

Fair enough, that was certainly more extreme optimism than realistic 
expectation on my part :)

There is some argument for taking #1 and #2 as 5.4 fixes, though - the 
upcoming Mesa 19.2 release will enable T820 support on the userspace 
side - so let's pick that discussion up again in a few weeks.

Robin.

(And at worst, I guess we could carry the "cfg.ias = 48" workaround in 
the DRM driver for the 5.4 cycle if need be)

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