On Thu, 07 Jan 2021, Lyude Paul lyude@redhat.com wrote:

Since we now support controlling panel backlights through DPCD using both the standard VESA interface, and Intel's proprietary HDR backlight interface, we should allow the user to be able to explicitly choose between one or the other in the event that we're wrong about panels reliably reporting support for the Intel HDR interface.

So, this commit adds support for this by introducing two new enable_dpcd_backlight options: 2 which forces i915 to only probe for the VESA interface, and 3 which forces i915 to only probe for the Intel backlight interface (might be useful if we find panels in the wild that report the VESA interface in their VBT, but actually only support the Intel backlight interface).

v3:

• Rebase

Signed-off-by: Lyude Paul lyude@redhat.com Reviewed-by: Jani Nikula jani.nikula@intel.com

Yup. Feels maybe a bit convoluted, but I'll trust your judgement as you've been playing with these.

BR, Jani.

Cc: thaytan@noraisin.net Cc: Vasily Khoruzhick anarsoul@gmail.com

---

.../drm/i915/display/intel_dp_aux_backlight.c | 45 +++++++++++++++++-- drivers/gpu/drm/i915/i915_params.c | 2 +- 2 files changed, 43 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c index 5e761fb49a14..4b2cb20b1f94 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c @@ -613,15 +613,54 @@ static const struct intel_panel_bl_funcs intel_dp_vesa_bl_funcs = { .get = intel_dp_aux_vesa_get_backlight, };

+enum intel_dp_aux_backlight_modparam {

• INTEL_DP_AUX_BACKLIGHT_AUTO = -1,
• INTEL_DP_AUX_BACKLIGHT_OFF = 0,
• INTEL_DP_AUX_BACKLIGHT_ON = 1,
• INTEL_DP_AUX_BACKLIGHT_FORCE_VESA = 2,
• INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL = 3,

+};

int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector) { struct drm_device *dev = connector->base.dev; struct intel_panel *panel = &connector->panel; struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder); struct drm_i915_private *i915 = dp_to_i915(intel_dp);

• bool try_intel_interface = false, try_vesa_interface = false;

• if (i915->params.enable_dpcd_backlight == 0)

• /* Check the VBT and user's module parameters to figure out which

• * interfaces to probe
  

• */
  

• switch (i915->params.enable_dpcd_backlight) {

• case INTEL_DP_AUX_BACKLIGHT_OFF: return -ENODEV;

• case INTEL_DP_AUX_BACKLIGHT_AUTO:

• switch (i915->vbt.backlight.type) {
  

• case INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE:
  

• 	try_vesa_interface = true;
  

• 	break;
  

• case INTEL_BACKLIGHT_DISPLAY_DDI:
  

• 	try_intel_interface = true;
  

• 	try_vesa_interface = true;
  

• 	break;
  

• default:
  

• 	return -ENODEV;
  

• }
  

• break;
  

• case INTEL_DP_AUX_BACKLIGHT_ON:

• if (i915->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE)
  

• 	try_intel_interface = true;
  

• try_vesa_interface = true;
  

• break;
  

• case INTEL_DP_AUX_BACKLIGHT_FORCE_VESA:

• try_vesa_interface = true;
  

• break;
  

• case INTEL_DP_AUX_BACKLIGHT_FORCE_INTEL:

• try_intel_interface = true;
  

• break;
  

• }

  /*

  • A lot of eDP panels in the wild will report supporting both the

@@ -630,13 +669,13 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *connector) * and will only work with the Intel interface. So, always probe for * that first. */

• if (intel_dp_aux_supports_hdr_backlight(connector)) {

• if (try_intel_interface && intel_dp_aux_supports_hdr_backlight(connector)) { drm_dbg_kms(dev, "Using Intel proprietary eDP backlight controls\n"); panel->backlight.funcs = &intel_dp_hdr_bl_funcs; return 0; }

• if (intel_dp_aux_supports_vesa_backlight(connector)) {

• if (try_vesa_interface && intel_dp_aux_supports_vesa_backlight(connector)) { drm_dbg_kms(dev, "Using VESA eDP backlight controls\n"); panel->backlight.funcs = &intel_dp_vesa_bl_funcs; return 0;

diff --git a/drivers/gpu/drm/i915/i915_params.c b/drivers/gpu/drm/i915/i915_params.c index 7f139ea4a90b..6939634e56ed 100644 --- a/drivers/gpu/drm/i915/i915_params.c +++ b/drivers/gpu/drm/i915/i915_params.c @@ -185,7 +185,7 @@ i915_param_named_unsafe(inject_probe_failure, uint, 0400,

i915_param_named(enable_dpcd_backlight, int, 0400, "Enable support for DPCD backlight control"

• "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enabled)");

• "(-1=use per-VBT LFP backlight type setting [default], 0=disabled, 1=enable, 2=force VESA interface, 3=force Intel interface)");

#if IS_ENABLED(CONFIG_DRM_I915_GVT) i915_param_named(enable_gvt, bool, 0400,