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| author | Jani Nikula <jani.nikula@intel.com> | 2017-07-20 12:25:16 +0300 |
|---|---|---|
| committer | Jani Nikula <jani.nikula@intel.com> | 2017-07-21 09:31:35 +0300 |
| commit | 7d9a1e418c962c2b25b8835dd3a6c68f81912fcd (patch) | |
| tree | 7747ae0a1d17ce436c89ac20ac8c138be4dfde17 /drivers/gpu/drm | |
| parent | 3118cb0678550e4296a7ae3f5d88ca5a714fd155 (diff) | |
| download | linux-7d9a1e418c962c2b25b8835dd3a6c68f81912fcd.tar.xz | |
Revert "drm/i915: Add option to support dynamic backlight via DPCD"
This reverts commit ae25eceab616d16a07bcaa434b84463d58a3bdc3.
The DPCD backlight commits regress a Thinkpad X1 Carbon 4th Gen and a
BXT-P (in CI). Enabling dynamic backlight boots to a black screen, and
enabling DPCD backlight leads to a black screen after suspend/resume.
References: http://mid.mail-archive.com/20170706135349.6tu3lz7uehazlnnn@boom
References: http://mid.mail-archive.com/20170627132326.f2q3yn4bh5flji4q@boom
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=101619
Reported-by: David Weinehall <david.weinehall@linux.intel.com>
Fixes: ae25eceab616 ("drm/i915: Add option to support dynamic backlight via DPCD")
Cc: Jenny TC <jenny.tc@intel.com>
Cc: David Weinehall <david.weinehall@linux.intel.com>
Cc: Puthikorn Voravootivat <puthik@chromium.org>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/051eeb592361985d2d06333c61c220dd92253b09.1500542254.git.jani.nikula@intel.com
Diffstat (limited to 'drivers/gpu/drm')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_params.c | 5 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_params.h | 3 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 26 |
3 files changed, 1 insertions, 33 deletions
diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index 88b9d3e6713a..5b5ab15d191f 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -65,7 +65,6 @@ struct i915_params i915 __read_mostly = { .inject_load_failure = 0, .enable_dpcd_backlight = -1, .enable_gvt = false, - .enable_dbc = true, }; module_param_named(modeset, i915.modeset, int, 0400); @@ -255,7 +254,3 @@ MODULE_PARM_DESC(enable_dpcd_backlight, module_param_named(enable_gvt, i915.enable_gvt, bool, 0400); MODULE_PARM_DESC(enable_gvt, "Enable support for Intel GVT-g graphics virtualization host support(default:false)"); - -module_param_named_unsafe(enable_dbc, i915.enable_dbc, bool, 0600); -MODULE_PARM_DESC(enable_dbc, - "Enable support for dynamic backlight control (default:true)"); diff --git a/drivers/gpu/drm/i915/i915_params.h b/drivers/gpu/drm/i915/i915_params.h index 057e203e6bda..0d6cf9138dc4 100644 --- a/drivers/gpu/drm/i915/i915_params.h +++ b/drivers/gpu/drm/i915/i915_params.h @@ -67,8 +67,7 @@ func(bool, verbose_state_checks); \ func(bool, nuclear_pageflip); \ func(bool, enable_dp_mst); \ - func(bool, enable_gvt); \ - func(bool, enable_dbc) + func(bool, enable_gvt) #define MEMBER(T, member) T member struct i915_params { diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c index b25cd88fc1c5..fea161727c6e 100644 --- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c +++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c @@ -173,24 +173,6 @@ static bool intel_dp_aux_set_pwm_freq(struct intel_connector *connector) return true; } -/* -* Set minimum / maximum dynamic brightness percentage. This value is expressed -* as the percentage of normal brightness in 5% increments. -*/ -static bool -intel_dp_aux_set_dynamic_backlight_percent(struct intel_dp *intel_dp, - u32 min, u32 max) -{ - u8 dbc[] = { DIV_ROUND_CLOSEST(min, 5), DIV_ROUND_CLOSEST(max, 5) }; - - if (drm_dp_dpcd_write(&intel_dp->aux, DP_EDP_DBC_MINIMUM_BRIGHTNESS_SET, - dbc, sizeof(dbc)) < 0) { - DRM_DEBUG_KMS("Failed to write aux DBC brightness level\n"); - return false; - } - return true; -} - static void intel_dp_aux_enable_backlight(const struct intel_crtc_state *crtc_state, const struct drm_connector_state *conn_state) { @@ -226,14 +208,6 @@ static void intel_dp_aux_enable_backlight(const struct intel_crtc_state *crtc_st if (intel_dp_aux_set_pwm_freq(connector)) new_dpcd_buf |= DP_EDP_BACKLIGHT_FREQ_AUX_SET_ENABLE; - if (i915.enable_dbc && - (intel_dp->edp_dpcd[2] & DP_EDP_DYNAMIC_BACKLIGHT_CAP)) { - if(intel_dp_aux_set_dynamic_backlight_percent(intel_dp, 0, 100)) { - new_dpcd_buf |= DP_EDP_DYNAMIC_BACKLIGHT_ENABLE; - DRM_DEBUG_KMS("Enable dynamic brightness.\n"); - } - } - if (new_dpcd_buf != dpcd_buf) { if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, new_dpcd_buf) < 0) { |