linux-kernel - [PATCH v8 05/15] drm/msm/dp: use the eDP bridge ops to validate eDP modes

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Date:   Wed, 12 Oct 2022 17:32:29 +0530
From:   Vinod Polimera <quic_vpolimer@...cinc.com>
To:     dri-devel@...ts.freedesktop.org, linux-arm-msm@...r.kernel.org,
        freedreno@...ts.freedesktop.org, devicetree@...r.kernel.org
Cc:     Vinod Polimera <quic_vpolimer@...cinc.com>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, swboyd@...omium.org,
        quic_kalyant@...cinc.com, dmitry.baryshkov@...aro.org,
        quic_khsieh@...cinc.com, quic_vproddut@...cinc.com,
        quic_bjorande@...cinc.com, quic_aravindh@...cinc.com,
        quic_abhinavk@...cinc.com, quic_sbillaka@...cinc.com
Subject: [PATCH v8 05/15] drm/msm/dp: use the eDP bridge ops to validate eDP modes

The eDP and DP interfaces shared the bridge operations and
the eDP specific changes were implemented under is_edp check.
To add psr support for eDP, we started using a new set of eDP
bridge ops. We are moving the eDP specific code in the
dp_bridge_mode_valid function to a new eDP function,
edp_bridge_mode_valid under the eDP bridge ops.

Signed-off-by: Sankeerth Billakanti <quic_sbillaka@...cinc.com>
Signed-off-by: Vinod Polimera <quic_vpolimer@...cinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
---
 drivers/gpu/drm/msm/dp/dp_display.c |  8 --------
 drivers/gpu/drm/msm/dp/dp_drm.c     | 34 +++++++++++++++++++++++++++++++++-
 2 files changed, 33 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_display.c b/drivers/gpu/drm/msm/dp/dp_display.c
index 5f2aae4..e481099 100644
--- a/drivers/gpu/drm/msm/dp/dp_display.c
+++ b/drivers/gpu/drm/msm/dp/dp_display.c
@@ -984,14 +984,6 @@ enum drm_mode_status dp_bridge_mode_valid(struct drm_bridge *bridge,
 		return -EINVAL;
 	}
 
-	/*
-	 * The eDP controller currently does not have a reliable way of
-	 * enabling panel power to read sink capabilities. So, we rely
-	 * on the panel driver to populate only supported modes for now.
-	 */
-	if (dp->is_edp)
-		return MODE_OK;
-
 	if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
 		return MODE_CLOCK_HIGH;
 
diff --git a/drivers/gpu/drm/msm/dp/dp_drm.c b/drivers/gpu/drm/msm/dp/dp_drm.c
index a3491d2..3e8912b 100644
--- a/drivers/gpu/drm/msm/dp/dp_drm.c
+++ b/drivers/gpu/drm/msm/dp/dp_drm.c
@@ -192,12 +192,44 @@ static void edp_bridge_atomic_post_disable(struct drm_bridge *drm_bridge,
 	dp_bridge_atomic_post_disable(drm_bridge, old_bridge_state);
 }
 
+/**
+ * edp_bridge_mode_valid - callback to determine if specified mode is valid
+ * @bridge: Pointer to drm bridge structure
+ * @info: display info
+ * @mode: Pointer to drm mode structure
+ * Returns: Validity status for specified mode
+ */
+static enum drm_mode_status edp_bridge_mode_valid(struct drm_bridge *bridge,
+					  const struct drm_display_info *info,
+					  const struct drm_display_mode *mode)
+{
+	struct msm_dp *dp;
+	int mode_pclk_khz = mode->clock;
+
+	dp = to_dp_bridge(bridge)->dp_display;
+
+	if (!dp || !mode_pclk_khz || !dp->connector) {
+		DRM_ERROR("invalid params\n");
+		return -EINVAL;
+	}
+
+	if (mode->clock > DP_MAX_PIXEL_CLK_KHZ)
+		return MODE_CLOCK_HIGH;
+
+	/*
+	 * The eDP controller currently does not have a reliable way of
+	 * enabling panel power to read sink capabilities. So, we rely
+	 * on the panel driver to populate only supported modes for now.
+	 */
+	return MODE_OK;
+}
+
 static const struct drm_bridge_funcs edp_bridge_ops = {
 	.atomic_enable = edp_bridge_atomic_enable,
 	.atomic_disable = edp_bridge_atomic_disable,
 	.atomic_post_disable = edp_bridge_atomic_post_disable,
 	.mode_set = dp_bridge_mode_set,
-	.mode_valid = dp_bridge_mode_valid,
+	.mode_valid = edp_bridge_mode_valid,
 	.atomic_reset = drm_atomic_helper_bridge_reset,
 	.atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state,
 	.atomic_destroy_state = drm_atomic_helper_bridge_destroy_state,
-- 
2.7.4