linux-kernel - [RFC v5 3/9] drm/i915/dpcd_bl: Cleanup intel_dp_aux_vesa_enable

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Message-Id: <20210507233947.751846-4-lyude@redhat.com>
Date:   Fri,  7 May 2021 19:39:41 -0400
From:   Lyude Paul <lyude@...hat.com>
To:     dri-devel@...ts.freedesktop.org, intel-gfx@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org
Cc:     Jani Nikula <jani.nikula@...el.com>,
        Dave Airlie <airlied@...il.com>, greg.depoire@...il.com,
        Rajeev Nandan <rajeevny@...eaurora.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Sean Paul <seanpaul@...omium.org>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>,
        linux-kernel@...r.kernel.org (open list)
Subject: [RFC v5 3/9] drm/i915/dpcd_bl: Cleanup intel_dp_aux_vesa_enable_backlight() a bit

Get rid of the extraneous switch case in here, and just open code
edp_backlight_mode as we only ever use it once.

v4:
* Check that backlight mode is DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD, not
  DP_EDP_BACKLIGHT_CONTROL_MODE_MASK - imirkin

Signed-off-by: Lyude Paul <lyude@...hat.com>
---
 .../gpu/drm/i915/display/intel_dp_aux_backlight.c | 15 ++-------------
 1 file changed, 2 insertions(+), 13 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 1dbe38282ebe..1ab82933afb5 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -382,7 +382,7 @@ intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
 	struct intel_dp *intel_dp = intel_attached_dp(connector);
 	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
 	struct intel_panel *panel = &connector->panel;
-	u8 dpcd_buf, new_dpcd_buf, edp_backlight_mode;
+	u8 dpcd_buf, new_dpcd_buf;
 	u8 pwmgen_bit_count = panel->backlight.edp.vesa.pwmgen_bit_count;
 
 	if (drm_dp_dpcd_readb(&intel_dp->aux,
@@ -393,12 +393,8 @@ intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
 	}
 
 	new_dpcd_buf = dpcd_buf;
-	edp_backlight_mode = dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK;
 
-	switch (edp_backlight_mode) {
-	case DP_EDP_BACKLIGHT_CONTROL_MODE_PWM:
-	case DP_EDP_BACKLIGHT_CONTROL_MODE_PRESET:
-	case DP_EDP_BACKLIGHT_CONTROL_MODE_PRODUCT:
+	if ((dpcd_buf & DP_EDP_BACKLIGHT_CONTROL_MODE_MASK) != DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
 		new_dpcd_buf &= ~DP_EDP_BACKLIGHT_CONTROL_MODE_MASK;
 		new_dpcd_buf |= DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD;
 
@@ -406,13 +402,6 @@ intel_dp_aux_vesa_enable_backlight(const struct intel_crtc_state *crtc_state,
 				       pwmgen_bit_count) != 1)
 			drm_dbg_kms(&i915->drm,
 				    "Failed to write aux pwmgen bit count\n");
-
-		break;
-
-	/* Do nothing when it is already DPCD mode */
-	case DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD:
-	default:
-		break;
 	}
 
 	if (panel->backlight.edp.vesa.pwm_freq_pre_divider) {
-- 
2.30.2