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drm/i915: Add comments about fixed pipe->transcoder/PLL mapping 

Code checkers may complain about the explicit casts between different
enum types, so add comments for known-valid cases to help future
triaging of such complaints.

v2:
- Make the comments more logical (Ville).

Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463059132-1720-3-git-send-email-imre.deak@intel.com
This commit is contained in:
Imre Deak 2016-05-12 16:18:50 +03:00
parent 7494bcdca2
commit d9a7bc67cb
1 changed files with 8 additions and 0 deletions
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8
drivers/gpu/drm/i915/intel_display.c
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@ -9290,6 +9290,10 @@ static bool ironlake_get_pipe_config(struct intel_crtc *crtc,
ironlake_get_fdi_m_n_config(crtc, pipe_config);
if (HAS_PCH_IBX(dev_priv)) {
/*
* The pipe->pch transcoder and pch transcoder->pll
* mapping is fixed.
*/
pll_id = (enum intel_dpll_id) crtc->pipe;
} else {
tmp = I915_READ(PCH_DPLL_SEL);
@ -9840,6 +9844,10 @@ static bool hsw_get_transcoder_state(struct intel_crtc *crtc,
enum intel_display_power_domain power_domain;
u32 tmp;
/*
* The pipe->transcoder mapping is fixed with the exception of the eDP
* transcoder handled below.
*/
pipe_config->cpu_transcoder = (enum transcoder) crtc->pipe;
/*