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
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
index 4b111a1..acc5b5a 100644
--- a/drivers/gpu/drm/i915/intel_ddi.c
+++ b/drivers/gpu/drm/i915/intel_ddi.c
@@ -345,7 +345,7 @@
static bool
intel_dig_port_supports_hdmi(const struct intel_digital_port *intel_dig_port)
{
- return intel_dig_port->hdmi.hdmi_reg;
+ return i915_mmio_reg_valid(intel_dig_port->hdmi.hdmi_reg);
}
static const struct ddi_buf_trans *skl_get_buf_trans_dp(struct drm_device *dev,
@@ -576,7 +576,7 @@
static void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,
enum port port)
{
- uint32_t reg = DDI_BUF_CTL(port);
+ i915_reg_t reg = DDI_BUF_CTL(port);
int i;
for (i = 0; i < 16; i++) {
@@ -931,7 +931,8 @@
/* Otherwise a < c && b >= d, do nothing */
}
-static int hsw_ddi_calc_wrpll_link(struct drm_i915_private *dev_priv, int reg)
+static int hsw_ddi_calc_wrpll_link(struct drm_i915_private *dev_priv,
+ i915_reg_t reg)
{
int refclk = LC_FREQ;
int n, p, r;
@@ -967,7 +968,7 @@
static int skl_calc_wrpll_link(struct drm_i915_private *dev_priv,
uint32_t dpll)
{
- uint32_t cfgcr1_reg, cfgcr2_reg;
+ i915_reg_t cfgcr1_reg, cfgcr2_reg;
uint32_t cfgcr1_val, cfgcr2_val;
uint32_t p0, p1, p2, dco_freq;
@@ -1930,7 +1931,7 @@
void intel_ddi_disable_transcoder_func(struct drm_i915_private *dev_priv,
enum transcoder cpu_transcoder)
{
- uint32_t reg = TRANS_DDI_FUNC_CTL(cpu_transcoder);
+ i915_reg_t reg = TRANS_DDI_FUNC_CTL(cpu_transcoder);
uint32_t val = I915_READ(reg);
val &= ~(TRANS_DDI_FUNC_ENABLE | TRANS_DDI_PORT_MASK | TRANS_DDI_DP_VC_PAYLOAD_ALLOC);
@@ -2507,7 +2508,7 @@
};
struct skl_dpll_regs {
- u32 ctl, cfgcr1, cfgcr2;
+ i915_reg_t ctl, cfgcr1, cfgcr2;
};
/* this array is indexed by the *shared* pll id */