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

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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: af73323b97 ("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>
This commit is contained in:
Alexander Stein 2023-11-02 10:50:47 +01:00 committed by Hans Verkuil
parent 1545c2b92b
commit d92e7a013f
2 changed files with 41 additions and 8 deletions
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44
drivers/media/v4l2-core/v4l2-cci.c
View File

@ -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",

5
include/media/v4l2-cci.h
View File

@ -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