[PATCH 3/6] drm/radeon: Writeback endian fixes

[Benjamin Herrenschmidt]

On Wed, 2011-07-13 at 10:42 -0400, Alex Deucher wrote:
> On Wed, Jul 13, 2011 at 2:28 AM, Benjamin Herrenschmidt
> <benh at kernel.crashing.org> wrote:
> > The writeback ring pointer and IH ring pointer are read using le32_to_cpu
> > so we do not want the chip to byteswap them on big-endian.
> >
> > We still want to byteswap the ring itself and the IBs, so we don't touch
> > that but we remove setting of the byteswap bits in CP_RB_RPTR_ADDR and
> > IH_CNTL.
> >
> > In general, for things like that where we control all the accessors easily,
> > we are better off doing the swap in SW rather than HW. Paradoxally, it does
> > keep the code closer to x86 and avoid using poorly tested HW features.
> >
> > I also changed the use of RADEON_ to R600_ in a couple of cases to be more
> > consistent with the surrounding code.
> >
> > Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>
> 
> evergreen.c and ni.c will need similar fixes.

evergreen.c -is- fixed in the patch :-) ni.c doesn't seem to set
swapping on the write back of the ring pointer (can you dbl check ?), it
only enables swapping on the ring itself which is correct as far as I
can tell.

Cheers,
Ben.

> Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> 
> > ---
> >
> > (resent adding dri-devel to the CC list to hit patchwork)
> >
> >  drivers/gpu/drm/radeon/evergreen.c |    3 ---
> >  drivers/gpu/drm/radeon/r600.c      |    7 -------
> >  drivers/gpu/drm/radeon/r600_cp.c   |   23 +++++++++--------------
> >  3 files changed, 9 insertions(+), 24 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
> > index e8a5ffb..23cf089 100644
> > --- a/drivers/gpu/drm/radeon/evergreen.c
> > +++ b/drivers/gpu/drm/radeon/evergreen.c
> > @@ -1359,9 +1359,6 @@ int evergreen_cp_resume(struct radeon_device *rdev)
> >
> >        /* set the wb address wether it's enabled or not */
> >        WREG32(CP_RB_RPTR_ADDR,
> > -#ifdef __BIG_ENDIAN
> > -              RB_RPTR_SWAP(2) |
> > -#endif
> >               ((rdev->wb.gpu_addr + RADEON_WB_CP_RPTR_OFFSET) & 0xFFFFFFFC));
> >        WREG32(CP_RB_RPTR_ADDR_HI, upper_32_bits(rdev->wb.gpu_addr + RADEON_WB_CP_RPTR_OFFSET) & 0xFF);
> >        WREG32(SCRATCH_ADDR, ((rdev->wb.gpu_addr + RADEON_WB_SCRATCH_OFFSET) >> 8) & 0xFFFFFFFF);
> > diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
> > index f79d2cc..3c86b15 100644
> > --- a/drivers/gpu/drm/radeon/r600.c
> > +++ b/drivers/gpu/drm/radeon/r600.c
> > @@ -2212,9 +2212,6 @@ int r600_cp_resume(struct radeon_device *rdev)
> >
> >        /* set the wb address whether it's enabled or not */
> >        WREG32(CP_RB_RPTR_ADDR,
> > -#ifdef __BIG_ENDIAN
> > -              RB_RPTR_SWAP(2) |
> > -#endif
> >               ((rdev->wb.gpu_addr + RADEON_WB_CP_RPTR_OFFSET) & 0xFFFFFFFC));
> >        WREG32(CP_RB_RPTR_ADDR_HI, upper_32_bits(rdev->wb.gpu_addr + RADEON_WB_CP_RPTR_OFFSET) & 0xFF);
> >        WREG32(SCRATCH_ADDR, ((rdev->wb.gpu_addr + RADEON_WB_SCRATCH_OFFSET) >> 8) & 0xFFFFFFFF);
> > @@ -2993,10 +2990,6 @@ int r600_irq_init(struct radeon_device *rdev)
> >        /* RPTR_REARM only works if msi's are enabled */
> >        if (rdev->msi_enabled)
> >                ih_cntl |= RPTR_REARM;
> > -
> > -#ifdef __BIG_ENDIAN
> > -       ih_cntl |= IH_MC_SWAP(IH_MC_SWAP_32BIT);
> > -#endif
> >        WREG32(IH_CNTL, ih_cntl);
> >
> >        /* force the active interrupt state to all disabled */
> > diff --git a/drivers/gpu/drm/radeon/r600_cp.c b/drivers/gpu/drm/radeon/r600_cp.c
> > index c3ab959..45fd592 100644
> > --- a/drivers/gpu/drm/radeon/r600_cp.c
> > +++ b/drivers/gpu/drm/radeon/r600_cp.c
> > @@ -1802,8 +1802,8 @@ static void r600_cp_init_ring_buffer(struct drm_device *dev,
> >        /* Set ring buffer size */
> >  #ifdef __BIG_ENDIAN
> >        RADEON_WRITE(R600_CP_RB_CNTL,
> > -                    RADEON_BUF_SWAP_32BIT |
> > -                    RADEON_RB_NO_UPDATE |
> > +                    R600_BUF_SWAP_32BIT |
> > +                    R600_RB_NO_UPDATE |
> >                     (dev_priv->ring.rptr_update_l2qw << 8) |
> >                     dev_priv->ring.size_l2qw);
> >  #else
> > @@ -1820,15 +1820,15 @@ static void r600_cp_init_ring_buffer(struct drm_device *dev,
> >
> >  #ifdef __BIG_ENDIAN
> >        RADEON_WRITE(R600_CP_RB_CNTL,
> > -                    RADEON_BUF_SWAP_32BIT |
> > -                    RADEON_RB_NO_UPDATE |
> > -                    RADEON_RB_RPTR_WR_ENA |
> > +                    R600_BUF_SWAP_32BIT |
> > +                    R600_RB_NO_UPDATE |
> > +                    R600_RB_RPTR_WR_ENA |
> >                     (dev_priv->ring.rptr_update_l2qw << 8) |
> >                     dev_priv->ring.size_l2qw);
> >  #else
> >        RADEON_WRITE(R600_CP_RB_CNTL,
> > -                    RADEON_RB_NO_UPDATE |
> > -                    RADEON_RB_RPTR_WR_ENA |
> > +                    R600_RB_NO_UPDATE |
> > +                    R600_RB_RPTR_WR_ENA |
> >                     (dev_priv->ring.rptr_update_l2qw << 8) |
> >                     dev_priv->ring.size_l2qw);
> >  #endif
> > @@ -1851,13 +1851,8 @@ static void r600_cp_init_ring_buffer(struct drm_device *dev,
> >                        - ((unsigned long) dev->sg->virtual)
> >                        + dev_priv->gart_vm_start;
> >        }
> > -       RADEON_WRITE(R600_CP_RB_RPTR_ADDR,
> > -#ifdef __BIG_ENDIAN
> > -                    (2 << 0) |
> > -#endif
> > -                    (rptr_addr & 0xfffffffc));
> > -       RADEON_WRITE(R600_CP_RB_RPTR_ADDR_HI,
> > -                    upper_32_bits(rptr_addr));
> > +       RADEON_WRITE(R600_CP_RB_RPTR_ADDR, (rptr_addr & 0xfffffffc));
> > +       RADEON_WRITE(R600_CP_RB_RPTR_ADDR_HI, upper_32_bits(rptr_addr));
> >
> >  #ifdef __BIG_ENDIAN
> >        RADEON_WRITE(R600_CP_RB_CNTL,
> >
> >
> >
> >