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authorVille Syrjälä <ville.syrjala@linux.intel.com>2015-11-18 15:33:26 +0200
committerVille Syrjälä <ville.syrjala@linux.intel.com>2015-11-18 15:39:11 +0200
commitf0f59a00a1c9be11038bef5aa735ed7dd985f9cf (patch)
tree1b76f7943326743233be6436376750ba4db78af4 /drivers/gpu/drm/i915/intel_crt.c
parent9bca5d0ca76c0ce029e2b43cf081863e7e8f6768 (diff)
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_crt.c')
-rw-r--r--drivers/gpu/drm/i915/intel_crt.c14
1 files changed, 5 insertions, 9 deletions
diff --git a/drivers/gpu/drm/i915/intel_crt.c b/drivers/gpu/drm/i915/intel_crt.c
index b84aaa0bb48a..67775af63d43 100644
--- a/drivers/gpu/drm/i915/intel_crt.c
+++ b/drivers/gpu/drm/i915/intel_crt.c
@@ -50,7 +50,7 @@ struct intel_crt {
* encoder's enable/disable callbacks */
struct intel_connector *connector;
bool force_hotplug_required;
- u32 adpa_reg;
+ i915_reg_t adpa_reg;
};
static struct intel_crt *intel_encoder_to_crt(struct intel_encoder *encoder)
@@ -501,12 +501,8 @@ intel_crt_load_detect(struct intel_crt *crt)
uint32_t vsample;
uint32_t vblank, vblank_start, vblank_end;
uint32_t dsl;
- uint32_t bclrpat_reg;
- uint32_t vtotal_reg;
- uint32_t vblank_reg;
- uint32_t vsync_reg;
- uint32_t pipeconf_reg;
- uint32_t pipe_dsl_reg;
+ i915_reg_t bclrpat_reg, vtotal_reg,
+ vblank_reg, vsync_reg, pipeconf_reg, pipe_dsl_reg;
uint8_t st00;
enum drm_connector_status status;
@@ -539,7 +535,7 @@ intel_crt_load_detect(struct intel_crt *crt)
/* Wait for next Vblank to substitue
* border color for Color info */
intel_wait_for_vblank(dev, pipe);
- st00 = I915_READ8(VGA_MSR_WRITE);
+ st00 = I915_READ8(_VGA_MSR_WRITE);
status = ((st00 & (1 << 4)) != 0) ?
connector_status_connected :
connector_status_disconnected;
@@ -584,7 +580,7 @@ intel_crt_load_detect(struct intel_crt *crt)
do {
count++;
/* Read the ST00 VGA status register */
- st00 = I915_READ8(VGA_MSR_WRITE);
+ st00 = I915_READ8(_VGA_MSR_WRITE);
if (st00 & (1 << 4))
detect++;
} while ((I915_READ(pipe_dsl_reg) == dsl));