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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2015-11-18 15:33:26 +0200 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2015-11-18 15:39:11 +0200 |
| commit | f0f59a00a1c9be11038bef5aa735ed7dd985f9cf (patch) | |
| tree | 1b76f7943326743233be6436376750ba4db78af4 /drivers/gpu/drm/i915/intel_dvo.c | |
| parent | 9bca5d0ca76c0ce029e2b43cf081863e7e8f6768 (diff) | |
| download | linux-f0f59a00a1c9be11038bef5aa735ed7dd985f9cf.tar.gz | |
drm/i915: Type safe register read/write
Make I915_READ and I915_WRITE more type safe by wrapping the register
offset in a struct. This should eliminate most of the fumbles we've had
with misplaced parens.
This only takes care of normal mmio registers. We could extend the idea
to other register types and define each with its own struct. That way
you wouldn't be able to accidentally pass the wrong thing to a specific
register access function.
The gpio_reg setup is probably the ugliest thing left. But I figure I'd
just leave it for now, and wait for some divine inspiration to strike
before making it nice.
As for the generated code, it's actually a bit better sometimes. Eg.
looking at i915_irq_handler(), we can see the following change:
lea 0x70024(%rdx,%rax,1),%r9d
mov $0x1,%edx
- movslq %r9d,%r9
- mov %r9,%rsi
- mov %r9,-0x58(%rbp)
- callq *0xd8(%rbx)
+ mov %r9d,%esi
+ mov %r9d,-0x48(%rbp)
callq *0xd8(%rbx)
So previously gcc thought the register offset might be signed and
decided to sign extend it, just in case. The rest appears to be
mostly just minor shuffling of instructions.
v2: i915_mmio_reg_{offset,equal,valid}() helpers added
s/_REG/_MMIO/ in the register defines
mo more switch statements left to worry about
ring_emit stuff got sorted in a prep patch
cmd parser, lrc context and w/a batch buildup also in prep patch
vgpu stuff cleaned up and moved to a prep patch
all other unrelated changes split out
v3: Rebased due to BXT DSI/BLC, MOCS, etc.
v4: Rebased due to churn, s/i915_mmio_reg_t/i915_reg_t/
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/1447853606-2751-1-git-send-email-ville.syrjala@linux.intel.com
Diffstat (limited to 'drivers/gpu/drm/i915/intel_dvo.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dvo.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/gpu/drm/i915/intel_dvo.c b/drivers/gpu/drm/i915/intel_dvo.c index 3d31d84e9868..7161deb2aed8 100644 --- a/drivers/gpu/drm/i915/intel_dvo.c +++ b/drivers/gpu/drm/i915/intel_dvo.c @@ -178,7 +178,7 @@ static void intel_disable_dvo(struct intel_encoder *encoder) { struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; struct intel_dvo *intel_dvo = enc_to_dvo(encoder); - u32 dvo_reg = intel_dvo->dev.dvo_reg; + i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg; u32 temp = I915_READ(dvo_reg); intel_dvo->dev.dev_ops->dpms(&intel_dvo->dev, false); @@ -191,7 +191,7 @@ static void intel_enable_dvo(struct intel_encoder *encoder) struct drm_i915_private *dev_priv = encoder->base.dev->dev_private; struct intel_dvo *intel_dvo = enc_to_dvo(encoder); struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc); - u32 dvo_reg = intel_dvo->dev.dvo_reg; + i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg; u32 temp = I915_READ(dvo_reg); intel_dvo->dev.dev_ops->mode_set(&intel_dvo->dev, @@ -262,8 +262,8 @@ static void intel_dvo_pre_enable(struct intel_encoder *encoder) struct intel_dvo *intel_dvo = enc_to_dvo(encoder); int pipe = crtc->pipe; u32 dvo_val; - u32 dvo_reg = intel_dvo->dev.dvo_reg; - u32 dvo_srcdim_reg = intel_dvo->dev.dvo_srcdim_reg; + i915_reg_t dvo_reg = intel_dvo->dev.dvo_reg; + i915_reg_t dvo_srcdim_reg = intel_dvo->dev.dvo_srcdim_reg; /* Save the data order, since I don't know what it should be set to. */ dvo_val = I915_READ(dvo_reg) & |