Patch "media: v4l2-cci: Add support for little-endian encoded registers" has been added to the 6.7-stable tree

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This is a note to let you know that I've just added the patch titled

    media: v4l2-cci: Add support for little-endian encoded registers

to the 6.7-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     media-v4l2-cci-add-support-for-little-endian-encoded.patch
and it can be found in the queue-6.7 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 8a9bd313a0dcd8a144265640d7100a3842d3acba
Author: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
Date:   Thu Nov 2 10:50:47 2023 +0100

    media: v4l2-cci: Add support for little-endian encoded registers
    
    [ Upstream commit d92e7a013ff33f4e0b31bbf768d0c85a8acefebf ]
    
    Some sensors, e.g. Sony IMX290, are using little-endian registers. Add
    support for those by encoding the endianness into Bit 20 of the register
    address.
    
    Fixes: af73323b9770 ("media: imx290: Convert to new CCI register access helpers")
    Cc: stable@xxxxxxxxxxxxxxx
    Signed-off-by: Alexander Stein <alexander.stein@xxxxxxxxxxxxxxx>
    Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
    Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
    [Sakari Ailus: Fixed commit message.]
    Signed-off-by: Sakari Ailus <sakari.ailus@xxxxxxxxxxxxxxx>
    Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/media/v4l2-core/v4l2-cci.c b/drivers/media/v4l2-core/v4l2-cci.c
index 3179160abde3..10005c80f43b 100644
--- a/drivers/media/v4l2-core/v4l2-cci.c
+++ b/drivers/media/v4l2-core/v4l2-cci.c
@@ -18,6 +18,7 @@
 
 int cci_read(struct regmap *map, u32 reg, u64 *val, int *err)
 {
+	bool little_endian;
 	unsigned int len;
 	u8 buf[8];
 	int ret;
@@ -25,6 +26,7 @@ int cci_read(struct regmap *map, u32 reg, u64 *val, int *err)
 	if (err && *err)
 		return *err;
 
+	little_endian = reg & CCI_REG_LE;
 	len = CCI_REG_WIDTH_BYTES(reg);
 	reg = CCI_REG_ADDR(reg);
 
@@ -40,16 +42,28 @@ int cci_read(struct regmap *map, u32 reg, u64 *val, int *err)
 		*val = buf[0];
 		break;
 	case 2:
-		*val = get_unaligned_be16(buf);
+		if (little_endian)
+			*val = get_unaligned_le16(buf);
+		else
+			*val = get_unaligned_be16(buf);
 		break;
 	case 3:
-		*val = get_unaligned_be24(buf);
+		if (little_endian)
+			*val = get_unaligned_le24(buf);
+		else
+			*val = get_unaligned_be24(buf);
 		break;
 	case 4:
-		*val = get_unaligned_be32(buf);
+		if (little_endian)
+			*val = get_unaligned_le32(buf);
+		else
+			*val = get_unaligned_be32(buf);
 		break;
 	case 8:
-		*val = get_unaligned_be64(buf);
+		if (little_endian)
+			*val = get_unaligned_le64(buf);
+		else
+			*val = get_unaligned_be64(buf);
 		break;
 	default:
 		dev_err(regmap_get_device(map), "Error invalid reg-width %u for reg 0x%04x\n",
@@ -68,6 +82,7 @@ EXPORT_SYMBOL_GPL(cci_read);
 
 int cci_write(struct regmap *map, u32 reg, u64 val, int *err)
 {
+	bool little_endian;
 	unsigned int len;
 	u8 buf[8];
 	int ret;
@@ -75,6 +90,7 @@ int cci_write(struct regmap *map, u32 reg, u64 val, int *err)
 	if (err && *err)
 		return *err;
 
+	little_endian = reg & CCI_REG_LE;
 	len = CCI_REG_WIDTH_BYTES(reg);
 	reg = CCI_REG_ADDR(reg);
 
@@ -83,16 +99,28 @@ int cci_write(struct regmap *map, u32 reg, u64 val, int *err)
 		buf[0] = val;
 		break;
 	case 2:
-		put_unaligned_be16(val, buf);
+		if (little_endian)
+			put_unaligned_le16(val, buf);
+		else
+			put_unaligned_be16(val, buf);
 		break;
 	case 3:
-		put_unaligned_be24(val, buf);
+		if (little_endian)
+			put_unaligned_le24(val, buf);
+		else
+			put_unaligned_be24(val, buf);
 		break;
 	case 4:
-		put_unaligned_be32(val, buf);
+		if (little_endian)
+			put_unaligned_le32(val, buf);
+		else
+			put_unaligned_be32(val, buf);
 		break;
 	case 8:
-		put_unaligned_be64(val, buf);
+		if (little_endian)
+			put_unaligned_le64(val, buf);
+		else
+			put_unaligned_be64(val, buf);
 		break;
 	default:
 		dev_err(regmap_get_device(map), "Error invalid reg-width %u for reg 0x%04x\n",
diff --git a/include/media/v4l2-cci.h b/include/media/v4l2-cci.h
index a2835a663df5..8b0b361b464c 100644
--- a/include/media/v4l2-cci.h
+++ b/include/media/v4l2-cci.h
@@ -38,12 +38,17 @@ struct cci_reg_sequence {
 #define CCI_REG_WIDTH_BYTES(x)		FIELD_GET(CCI_REG_WIDTH_MASK, x)
 #define CCI_REG_WIDTH(x)		(CCI_REG_WIDTH_BYTES(x) << 3)
 #define CCI_REG_ADDR(x)			FIELD_GET(CCI_REG_ADDR_MASK, x)
+#define CCI_REG_LE			BIT(20)
 
 #define CCI_REG8(x)			((1 << CCI_REG_WIDTH_SHIFT) | (x))
 #define CCI_REG16(x)			((2 << CCI_REG_WIDTH_SHIFT) | (x))
 #define CCI_REG24(x)			((3 << CCI_REG_WIDTH_SHIFT) | (x))
 #define CCI_REG32(x)			((4 << CCI_REG_WIDTH_SHIFT) | (x))
 #define CCI_REG64(x)			((8 << CCI_REG_WIDTH_SHIFT) | (x))
+#define CCI_REG16_LE(x)			(CCI_REG_LE | (2U << CCI_REG_WIDTH_SHIFT) | (x))
+#define CCI_REG24_LE(x)			(CCI_REG_LE | (3U << CCI_REG_WIDTH_SHIFT) | (x))
+#define CCI_REG32_LE(x)			(CCI_REG_LE | (4U << CCI_REG_WIDTH_SHIFT) | (x))
+#define CCI_REG64_LE(x)			(CCI_REG_LE | (8U << CCI_REG_WIDTH_SHIFT) | (x))
 
 /**
  * cci_read() - Read a value from a single CCI register




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