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drm/i915: Update comment in clear_intel_crtc_state() 

Explain why a few fields of the new pipe_config have their values
preserved, while the others are zeroed.

Signed-off-by: Ander Conselvan de Oliveira <ander.conselvan.de.oliveira@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ander Conselvan de Oliveira 2015-05-20 09:03:27 +03:00 committed by Daniel Vetter
parent b88baa2a46
commit 7546a38411
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/i915/intel_display.c
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@ -11485,7 +11485,11 @@ clear_intel_crtc_state(struct intel_crtc_state *crtc_state)
enum intel_dpll_id shared_dpll;
uint32_t ddi_pll_sel;
/* Clear only the intel specific part of the crtc state excluding scalers */
/* FIXME: before the switch to atomic started, a new pipe_config was
* kzalloc'd. Code that depends on any field being zero should be
* fixed, so that the crtc_state can be safely duplicated. For now,
* only fields that are know to not cause problems are preserved. */
tmp_state = crtc_state->base;
scaler_state = crtc_state->scaler_state;
shared_dpll = crtc_state->shared_dpll;