drm/i915: Use POSTING_READ in lcpll code

If we don't use the return value of a mmio read our coding style is to
use the POSTING_READ macro. This avoids cluttering the mmio traces.

While at it add the missing posting read in the lcpll enable function
that Paulo spotted.

v2: Drop the _NOTRACE changes, tracing such wait_for loops in the modeset
code might actually be rather useful!

Cc: Paulo Zanoni <przanoni@gmail.com>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b29954ac6bfd..b4daa640a6d8 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -6036,13 +6036,14 @@ void hsw_restore_lcpll(struct drm_i915_private *dev_priv)
         if (val & LCPLL_POWER_DOWN_ALLOW) {
                 val &= ~LCPLL_POWER_DOWN_ALLOW;
                 I915_WRITE(LCPLL_CTL, val);
+                POSTING_READ(LCPLL_CTL);
         }
 
         val = I915_READ(D_COMP);
         val |= D_COMP_COMP_FORCE;
         val &= ~D_COMP_COMP_DISABLE;
         I915_WRITE(D_COMP, val);
-        I915_READ(D_COMP);
+        POSTING_READ(D_COMP);
 
         val = I915_READ(LCPLL_CTL);
         val &= ~LCPLL_PLL_DISABLE;