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drm/i915: Check backlight type while doing eDP backlight initializaiton

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If LFP backlight type setting from VBT was "VESA eDP AUX Interface".
Driver should check panel capability and try to initialize aux backlight.
No matter i915_modparams.enable_dpcd_backlight was enabled or not.

v2: access dev_priv->vbt.backlight.type directly and remove unused function.
v3: 1. Modify i915.enable_dpcd_backlight type from bool to int and give default
       value as 0 (disable).
    2. Add a judgement to check LFP backlight type was aux interface or not.

Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Jani Nikula <jani.nikula@intel.com>
Cc: Jose Roberto de Souza <jose.souza@intel.com>
Cc: Cooper Chiou <cooper.chiou@intel.com>

Signed-off-by: Lee Shawn C <shawn.c.lee@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1561045456-12171-1-git-send-email-shawn.c.lee@intel.com
This commit is contained in:
Lee Shawn C 2019-06-20 08:44:16 -07:00 committed by Jani Nikula
parent 93d7a3b4be
commit 5ccf2027bb
4 changed files with 9 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/i915/display/intel_bios.h
View File

@ -42,6 +42,7 @@ enum intel_backlight_type {
INTEL_BACKLIGHT_DISPLAY_DDI,
INTEL_BACKLIGHT_DSI_DCS,
INTEL_BACKLIGHT_PANEL_DRIVER_INTERFACE,
INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE,
};
struct edp_power_seq {

5
drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
View File

@ -264,8 +264,11 @@ intel_dp_aux_display_control_capable(struct intel_connector *connector)
int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector)
{
struct intel_panel *panel = &intel_connector->panel;
struct drm_i915_private *dev_priv = to_i915(intel_connector->base.dev);
if (!i915_modparams.enable_dpcd_backlight)
if (i915_modparams.enable_dpcd_backlight == 0 ||
(i915_modparams.enable_dpcd_backlight == -1 &&
dev_priv->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE))
return -ENODEV;
if (!intel_dp_aux_display_control_capable(intel_connector))

5
drivers/gpu/drm/i915/i915_params.c
View File

@ -169,8 +169,9 @@ i915_param_named_unsafe(inject_load_failure, uint, 0400,
"Force an error after a number of failure check points (0:disabled (default), N:force failure at the Nth failure check point)");
#endif
i915_param_named(enable_dpcd_backlight, bool, 0600,
"Enable support for DPCD backlight control (default:false)");
i915_param_named(enable_dpcd_backlight, int, 0600,
"Enable support for DPCD backlight control"
"(-1=use per-VBT LFP backlight type setting, 0=disabled [default], 1=enabled)");
#if IS_ENABLED(CONFIG_DRM_I915_GVT)
i915_param_named(enable_gvt, bool, 0400,

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

@ -64,6 +64,7 @@ struct drm_printer;
param(int, reset, 2) \
param(unsigned int, inject_load_failure, 0) \
param(int, fastboot, -1) \
param(int, enable_dpcd_backlight, 0) \
param(char *, force_probe, CONFIG_DRM_I915_FORCE_PROBE) \
/* leave bools at the end to not create holes */ \
param(bool, alpha_support, IS_ENABLED(CONFIG_DRM_I915_ALPHA_SUPPORT)) \
@ -76,7 +77,6 @@ struct drm_printer;
param(bool, verbose_state_checks, true) \
param(bool, nuclear_pageflip, false) \
param(bool, enable_dp_mst, true) \
param(bool, enable_dpcd_backlight, false) \
param(bool, enable_gvt, false)
#define MEMBER(T, member, ...) T member;