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drm/i915: add DPIO support

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ValleyView puts some display related registers like the PLL controls and
dividers behind the DPIO bus.  Add simple indirect register access
routines to get to those registers.

v2: move new wait_for macro to intel_drv.h (Ben)
    fix DPIO_PKT double write (Ben)
    add debugfs file

Reviewed-by: Ben Widawsky <ben@bwidawsk.net>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Jesse Barnes
2012-03-28 13:39:25 -07:00
committed by Daniel Vetter
parent 25eb05fc5a
commit 57f350b672
5 changed files with 182 additions and 0 deletions
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14
drivers/gpu/drm/i915/intel_drv.h
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@@ -45,6 +45,18 @@
ret__; \
})
#define wait_for_atomic_us(COND, US) ({ \
int i, ret__ = -ETIMEDOUT; \
for (i = 0; i < (US); i++) { \
if ((COND)) { \
ret__ = 0; \
break; \
} \
udelay(1); \
} \
ret__; \
})
#define wait_for(COND, MS) _wait_for(COND, MS, 1)
#define wait_for_atomic(COND, MS) _wait_for(COND, MS, 0)
@@ -420,4 +432,6 @@ extern int intel_sprite_set_colorkey(struct drm_device *dev, void *data,
extern int intel_sprite_get_colorkey(struct drm_device *dev, void *data,
struct drm_file *file_priv);
extern u32 intel_dpio_read(struct drm_i915_private *dev_priv, int reg);
#endif /* __INTEL_DRV_H__ */