2013/8/21 Daniel Vetter <daniel.vetter@xxxxxxxx>:
> 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@xxxxxxxxx>
> Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_display.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index 7a40427..937fc5a6 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;
> --
> 1.8.4.rc3
>
--
Paulo Zanoni
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