linux-kernel - [PATCH v3 3/5] drm/dp: make dp_link_status and dp_get_lane

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Date:   Tue, 28 Aug 2018 11:24:46 +0100
From:   Damian Kos <dkos@...ence.com>
To:     David Airlie <airlied@...ux.ie>, Rob Herring <robh+dt@...nel.org>,
        "Mark Rutland" <mark.rutland@....com>,
        Archit Taneja <architt@...eaurora.org>,
        Andrzej Hajda <a.hajda@...sung.com>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Sean Paul <sean@...rly.run>, Sandy Huang <hjc@...k-chips.com>,
        Heiko Stübner <heiko@...ech.de>,
        Damian Kos <dkos@...ence.com>,
        Quentin Schulz <quentin.schulz@...tlin.com>,
        <dri-devel@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-rockchip@...ts.infradead.org>
CC:     <pgaj@...ence.com>, <ltyrala@...ence.com>, <stelford@...ence.com>,
        <jartur@...ence.com>, <piotrs@...ence.com>
Subject: [PATCH v3 3/5] drm/dp: make dp_link_status and dp_get_lane_status usable from outside of the core

From: Quentin Schulz <quentin.schulz@...tlin.com>

dp_link_status and dp_get_lane_status are pretty generic and can be used for
other means, so let's make it "public".

This adds drm_dp_link_status and drm_dp_get_lane_status to the header file and
add the appropriate EXPORT_SYMBOL for it so that it can be used by other
drivers, be they compiled built-in or as modules.

Signed-off-by: Damian Kos <dkos@...ence.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 20 +++++++++++---------
 include/drm/drm_dp_helper.h     |  3 +++
 2 files changed, 14 insertions(+), 9 deletions(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 4b5bf6ee7fa7..ee9ec2ccf878 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -43,19 +43,21 @@
  */
 
 /* Helpers for DP link training */
-static u8 dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
+u8 drm_dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r)
 {
 	return link_status[r - DP_LANE0_1_STATUS];
 }
+EXPORT_SYMBOL(drm_dp_link_status);
 
-static u8 dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE],
+u8 drm_dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE],
 			     int lane)
 {
 	int i = DP_LANE0_1_STATUS + (lane >> 1);
 	int s = (lane & 1) * 4;
-	u8 l = dp_link_status(link_status, i);
+	u8 l = drm_dp_link_status(link_status, i);
 	return (l >> s) & 0xf;
 }
+EXPORT_SYMBOL(drm_dp_get_lane_status);
 
 bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
 			  int lane_count)
@@ -64,12 +66,12 @@ bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
 	u8 lane_status;
 	int lane;
 
-	lane_align = dp_link_status(link_status,
-				    DP_LANE_ALIGN_STATUS_UPDATED);
+	lane_align = drm_dp_link_status(link_status,
+					DP_LANE_ALIGN_STATUS_UPDATED);
 	if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0)
 		return false;
 	for (lane = 0; lane < lane_count; lane++) {
-		lane_status = dp_get_lane_status(link_status, lane);
+		lane_status = drm_dp_get_lane_status(link_status, lane);
 		if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS)
 			return false;
 	}
@@ -84,7 +86,7 @@ bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
 	u8 lane_status;
 
 	for (lane = 0; lane < lane_count; lane++) {
-		lane_status = dp_get_lane_status(link_status, lane);
+		lane_status = drm_dp_get_lane_status(link_status, lane);
 		if ((lane_status & DP_LANE_CR_DONE) == 0)
 			return false;
 	}
@@ -99,7 +101,7 @@ u8 drm_dp_get_adjust_request_voltage(const u8 link_status[DP_LINK_STATUS_SIZE],
 	int s = ((lane & 1) ?
 		 DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT :
 		 DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT);
-	u8 l = dp_link_status(link_status, i);
+	u8 l = drm_dp_link_status(link_status, i);
 
 	return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT;
 }
@@ -112,7 +114,7 @@ u8 drm_dp_get_adjust_request_pre_emphasis(const u8 link_status[DP_LINK_STATUS_SI
 	int s = ((lane & 1) ?
 		 DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT :
 		 DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT);
-	u8 l = dp_link_status(link_status, i);
+	u8 l = drm_dp_link_status(link_status, i);
 
 	return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT;
 }
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 06a478679781..9930b2b269f2 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -952,6 +952,9 @@
 #define DP_MST_LOGICAL_PORT_0 8
 
 #define DP_LINK_STATUS_SIZE	   6
+
+u8 drm_dp_link_status(const u8 link_status[DP_LINK_STATUS_SIZE], int r);
+u8 drm_dp_get_lane_status(const u8 link_status[DP_LINK_STATUS_SIZE], int lane);
 bool drm_dp_channel_eq_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
 			  int lane_count);
 bool drm_dp_clock_recovery_ok(const u8 link_status[DP_LINK_STATUS_SIZE],
-- 
2.17.1