linux-kernel - [PATCH v2] drm/bridge: anx7625: Fix not correct get property counts

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Date:   Fri, 11 Mar 2022 18:35:25 +0800
From:   Xin Ji <xji@...logixsemi.com>
To:     Andrzej Hajda <andrzej.hajda@...el.com>,
        Neil Armstrong <narmstrong@...libre.com>,
        Robert Foss <robert.foss@...aro.org>,
        Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
        Jonas Karlman <jonas@...boo.se>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, Xin Ji <xji@...logixsemi.com>
Cc:     bliang@...logixsemi.com, qwen@...logixsemi.com,
        hsinyi@...omium.org, mliu@...logixsemi.com,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2] drm/bridge: anx7625: Fix not correct get property counts

The property length which returns from "of_get_property", it means array
bytes count if the property has prefix as "/bits/ 8". The driver should
call function "of_property_read_u8_array" to get correct array value.

Fixes: fd0310b6fe7d ("drm/bridge: anx7625: add MIPI DPI input feature")
Signed-off-by: Xin Ji <xji@...logixsemi.com>

---
V1 -> V2: Fix Sam comment, use of_property_read_u8_array to get array
value
---
 drivers/gpu/drm/bridge/analogix/anx7625.c | 8 ++++----
 drivers/gpu/drm/bridge/analogix/anx7625.h | 4 ++--
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index c6a9a02ed762..628cbf769141 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -1598,8 +1598,8 @@ static int anx7625_get_swing_setting(struct device *dev,
 			num_regs = DP_TX_SWING_REG_CNT;
 
 		pdata->dp_lane0_swing_reg_cnt = num_regs;
-		of_property_read_u32_array(dev->of_node, "analogix,lane0-swing",
-					   pdata->lane0_reg_data, num_regs);
+		of_property_read_u8_array(dev->of_node, "analogix,lane0-swing",
+					  pdata->lane0_reg_data, num_regs);
 	}
 
 	if (of_get_property(dev->of_node,
@@ -1608,8 +1608,8 @@ static int anx7625_get_swing_setting(struct device *dev,
 			num_regs = DP_TX_SWING_REG_CNT;
 
 		pdata->dp_lane1_swing_reg_cnt = num_regs;
-		of_property_read_u32_array(dev->of_node, "analogix,lane1-swing",
-					   pdata->lane1_reg_data, num_regs);
+		of_property_read_u8_array(dev->of_node, "analogix,lane1-swing",
+					  pdata->lane1_reg_data, num_regs);
 	}
 
 	return 0;
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index edbbfe410a56..2c340f16f2c3 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -426,9 +426,9 @@ struct anx7625_platform_data {
 	int mipi_lanes;
 	int audio_en;
 	int dp_lane0_swing_reg_cnt;
-	int lane0_reg_data[DP_TX_SWING_REG_CNT];
 	int dp_lane1_swing_reg_cnt;
-	int lane1_reg_data[DP_TX_SWING_REG_CNT];
+	u8 lane0_reg_data[DP_TX_SWING_REG_CNT];
+	u8 lane1_reg_data[DP_TX_SWING_REG_CNT];
 	u32 low_power_mode;
 	struct device_node *mipi_host_node;
 };
-- 
2.25.1