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

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;