UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

Revert "drm/i915: Add heuristic to determine better way to adjust brightness" 

This reverts commit 560a758d39.

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: 560a758d39 ("drm/i915: Add heuristic to determine better way to adjust brightness")
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/f49a89a05f18e90871c2eeadcdcd783ac7961cdf.1500542254.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula 2017-07-20 12:25:17 +03:00
parent 7d9a1e418c
commit d2939424ff
3 changed files with 7 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/gpu/drm/i915/i915_params.c
View File

@ -63,7 +63,7 @@ struct i915_params i915 __read_mostly = {
.huc_firmware_path = NULL,
.enable_dp_mst = true,
.inject_load_failure = 0,
.enable_dpcd_backlight = -1,
.enable_dpcd_backlight = false,
.enable_gvt = false,
};
@ -246,10 +246,9 @@ MODULE_PARM_DESC(enable_dp_mst,
module_param_named_unsafe(inject_load_failure, i915.inject_load_failure, uint, 0400);
MODULE_PARM_DESC(inject_load_failure,
"Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
module_param_named_unsafe(enable_dpcd_backlight, i915.enable_dpcd_backlight, int, 0600);
module_param_named(enable_dpcd_backlight, i915.enable_dpcd_backlight, bool, 0600);
MODULE_PARM_DESC(enable_dpcd_backlight,
"Enable support for DPCD backlight control "
"(-1:auto (default), 0:force disable, 1:force enabled if supported");
"Enable support for DPCD backlight control (default:false)");
module_param_named(enable_gvt, i915.enable_gvt, bool, 0400);
MODULE_PARM_DESC(enable_gvt,

2
drivers/gpu/drm/i915/i915_params.h
View File

@ -53,7 +53,6 @@
func(int, edp_vswing); \
func(int, reset); \
func(unsigned int, inject_load_failure); \
func(int, enable_dpcd_backlight); \
/* leave bools at the end to not create holes */ \
func(bool, alpha_support); \
func(bool, enable_cmd_parser); \
@ -67,6 +66,7 @@
func(bool, verbose_state_checks); \
func(bool, nuclear_pageflip); \
func(bool, enable_dp_mst); \
func(bool, enable_dpcd_backlight); \
func(bool, enable_gvt)
#define MEMBER(T, member) T member

61
drivers/gpu/drm/i915/intel_dp_aux_backlight.c
View File

@ -251,66 +251,15 @@ intel_dp_aux_display_control_capable(struct intel_connector *connector)
/* Check the eDP Display control capabilities registers to determine if
* the panel can support backlight control over the aux channel
*/
if ((intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP) &&
(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
if (intel_dp->edp_dpcd[1] & DP_EDP_TCON_BACKLIGHT_ADJUSTMENT_CAP &&
(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP) &&
!(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP)) {
DRM_DEBUG_KMS("AUX Backlight Control Supported!\n");
return true;
}
return false;
}
/*
* Heuristic function whether we should use AUX for backlight adjustment or not.
*
* We should use AUX for backlight brightness adjustment if panel doesn't this
* via PWM pin or using AUX is better than using PWM pin.
*
* The heuristic to determine that using AUX pin is better than using PWM pin is
* that the panel support any of the feature list here.
* - Regional backlight brightness adjustment
* - Backlight PWM frequency set
* - More than 8 bits resolution of brightness level
* - Backlight enablement via AUX and not by BL_ENABLE pin
*
* If all above are not true, assume that using PWM pin is better.
*/
static bool
intel_dp_aux_display_control_heuristic(struct intel_connector *connector)
{
struct intel_dp *intel_dp = enc_to_intel_dp(&connector->encoder->base);
uint8_t reg_val;
/* Panel doesn't support adjusting backlight brightness via PWN pin */
if (!(intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP))
return true;
/* Panel supports regional backlight brightness adjustment */
if (drm_dp_dpcd_readb(&intel_dp->aux, DP_EDP_GENERAL_CAP_3,
&reg_val) != 1) {
DRM_DEBUG_KMS("Failed to read DPCD register 0x%x\n",
DP_EDP_GENERAL_CAP_3);
return false;
}
if (reg_val > 0)
return true;
/* Panel supports backlight PWM frequency set */
if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_FREQ_AUX_SET_CAP)
return true;
/* Panel supports more than 8 bits resolution of brightness level */
if (intel_dp->edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_BYTE_COUNT)
return true;
/* Panel supports enabling backlight via AUX but not by BL_ENABLE pin */
if ((intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
!(intel_dp->edp_dpcd[1] & DP_EDP_BACKLIGHT_PIN_ENABLE_CAP))
return true;
return false;
}
int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
{
struct intel_panel *panel = &intel_connector->panel;
@ -321,10 +270,6 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
if (!intel_dp_aux_display_control_capable(intel_connector))
return -ENODEV;
if (i915.enable_dpcd_backlight == -1 &&
!intel_dp_aux_display_control_heuristic(intel_connector))
return -ENODEV;
panel->backlight.setup = intel_dp_aux_setup_backlight;
panel->backlight.enable = intel_dp_aux_enable_backlight;
panel->backlight.disable = intel_dp_aux_disable_backlight;