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Subject: media: v4l2-cci: Add support for little-endian encoded registers Author: Alexander Stein alexander.stein@ew.tq-group.com Date: Thu Nov 2 10:50:47 2023 +0100

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@vger.kernel.org Signed-off-by: Alexander Stein alexander.stein@ew.tq-group.com Reviewed-by: Hans de Goede hdegoede@redhat.com Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com [Sakari Ailus: Fixed commit message.] Signed-off-by: Sakari Ailus sakari.ailus@linux.intel.com Signed-off-by: Hans Verkuil hverkuil-cisco@xs4all.nl

drivers/media/v4l2-core/v4l2-cci.c | 44 +++++++++++++++++++++++++++++++------- include/media/v4l2-cci.h | 5 +++++ 2 files changed, 41 insertions(+), 8 deletions(-)

---

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 406772a4e32e..4e96e90ee636 100644 --- a/include/media/v4l2-cci.h +++ b/include/media/v4l2-cci.h @@ -43,12 +43,17 @@ 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