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drm/i915: Do not read GAMMA_MODE register

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Implement Daniel Stone's recommendation to not read registers to infer
the hardware's state.

v2: Read GAMMA_MODE register value at init (Matt Roper's comment)

v3: Read GAMMA_MODE register in intel_modeset_readout_hw_state along
    with other registers (Matt Roper's comment).

v4: Mask GAMMA_MODE register with interesting bits when reading

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1458125837-2576-3-git-send-email-lionel.g.landwerlin@intel.com
This commit is contained in:
Lionel Landwerlin
2016-03-16 10:57:15 +00:00
committed by Matt Roper
parent 8563b1e8ef
commit 05dc698c2e
3 changed files with 11 additions and 2 deletions
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3
drivers/gpu/drm/i915/intel_drv.h
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@@ -578,6 +578,9 @@ struct intel_crtc_state {
*/
bool need_postvbl_update;
} wm;
/* Gamma mode programmed on the pipe */
uint32_t gamma_mode;
};
struct vlv_wm_state {