linux-kernel - [PATCH v3 06/38] drm/msm/dp: extract MISC1_MISC0 configuration into a separate function

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Message-Id: <20250825-msm-dp-mst-v3-6-01faacfcdedd@oss.qualcomm.com>
Date: Mon, 25 Aug 2025 22:15:52 +0800
From: Yongxing Mou <yongxing.mou@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Sean Paul <sean@...rly.run>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Yongxing Mou <yongxing.mou@....qualcomm.com>
Subject: [PATCH v3 06/38] drm/msm/dp: extract MISC1_MISC0 configuration
 into a separate function

The MISC1_MISC0 register contains stream-specific configuration bits.
To improve code clarity and modularity, this patch refactors the related
code into a new helper function: msm_dp_ctrl_config_misc1_misc0().

This separation also prepares the codebase for future MST stream
programming support.

Signed-off-by: Yongxing Mou <yongxing.mou@....qualcomm.com>
---
 drivers/gpu/drm/msm/dp/dp_ctrl.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
index 45d6c9a7f7ddaa049443253cbf4c6fc5feda3177..6bfb639c1ebd33f1103c5b68dfb40701738fa267 100644
--- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
+++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
@@ -447,13 +447,13 @@ static void msm_dp_ctrl_lane_mapping(struct msm_dp_ctrl_private *ctrl)
 			ln_mapping);
 }
 
-static void msm_dp_ctrl_configure_source_params(struct msm_dp_ctrl_private *ctrl)
+static void msm_dp_ctrl_config_misc1_misc0(struct msm_dp_ctrl_private *ctrl,
+					   struct msm_dp_panel *msm_dp_panel)
 {
 	u32 colorimetry_cfg, test_bits_depth, misc_val;
 
-	msm_dp_ctrl_config_ctrl_streams(ctrl, ctrl->panel);
-
-	test_bits_depth = msm_dp_link_get_test_bits_depth(ctrl->link, ctrl->panel->msm_dp_mode.bpp);
+	test_bits_depth = msm_dp_link_get_test_bits_depth(ctrl->link,
+		msm_dp_panel->msm_dp_mode.bpp);
 	colorimetry_cfg = msm_dp_link_get_colorimetry_config(ctrl->link);
 
 	misc_val = msm_dp_read_link(ctrl, REG_DP_MISC1_MISC0);
@@ -467,6 +467,13 @@ static void msm_dp_ctrl_configure_source_params(struct msm_dp_ctrl_private *ctrl
 
 	drm_dbg_dp(ctrl->drm_dev, "misc settings = 0x%x\n", misc_val);
 	msm_dp_write_link(ctrl, REG_DP_MISC1_MISC0, misc_val);
+}
+
+static void msm_dp_ctrl_configure_source_params(struct msm_dp_ctrl_private *ctrl)
+{
+	msm_dp_ctrl_config_ctrl_streams(ctrl, ctrl->panel);
+
+	msm_dp_ctrl_config_misc1_misc0(ctrl, ctrl->panel);
 
 	msm_dp_panel_timing_cfg(ctrl->panel, ctrl->msm_dp_ctrl.wide_bus_en);
 }

-- 
2.34.1