media: imx274: use regmap_bulk_write to write multybyte registers

Currently 2-bytes and 3-bytes registers are set by very similar
functions doing the needed shift & mask manipulation, followed by very
similar for loops setting one byte at a time over I2C.

Replace all of this code by a unique helper function that calls
regmap_bulk_write(), which has two advantages:
 - sets all the bytes in a unique I2C transaction
 - removes lots of now unused code.

Signed-off-by: Luca Ceresoli <luca@lucaceresoli.net>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/i2c/imx274.c b/drivers/media/i2c/imx274.c
index edca63e..093c458 100644 (file)
--- a/drivers/media/i2c/imx274.c
+++ b/drivers/media/i2c/imx274.c
@@ -690,6 +690,35 @@ static inline int imx274_write_reg(struct stimx274 *priv, u16 addr, u8 val)
        return err;
 }
 
+/**
+ * Write a multibyte register.
+ *
+ * Uses a bulk write where possible.
+ *
+ * @priv: Pointer to device structure
+ * @addr: Address of the LSB register.  Other registers must be
+ *        consecutive, least-to-most significant.
+ * @val: Value to be written to the register (cpu endianness)
+ * @nbytes: Number of bits to write (range: [1..3])
+ */
+static int imx274_write_mbreg(struct stimx274 *priv, u16 addr, u32 val,
+                             size_t nbytes)
+{
+       __le32 val_le = cpu_to_le32(val);
+       int err;
+
+       err = regmap_bulk_write(priv->regmap, addr, &val_le, nbytes);
+       if (err)
+               dev_err(&priv->client->dev,
+                       "%s : i2c bulk write failed, %x = %x (%zu bytes)\n",
+                       __func__, addr, val, nbytes);
+       else
+               dev_dbg(&priv->client->dev,
+                       "%s : addr 0x%x, val=0x%x (%zu bytes)\n",
+                       __func__, addr, val, nbytes);
+       return err;
+}
+
 /*
  * Set mode registers to start stream.
  * @priv: Pointer to device structure
@@ -1163,15 +1192,6 @@ static int imx274_set_digital_gain(struct stimx274 *priv, u32 dgain)
                                reg_val & IMX274_MASK_LSB_4_BITS);
 }
 
-static inline void imx274_calculate_gain_regs(struct reg_8 regs[2], u16 gain)
-{
-       regs->addr = IMX274_ANALOG_GAIN_ADDR_MSB;
-       regs->val = (gain >> IMX274_SHIFT_8_BITS) & IMX274_MASK_LSB_3_BITS;
-
-       (regs + 1)->addr = IMX274_ANALOG_GAIN_ADDR_LSB;
-       (regs + 1)->val = (gain) & IMX274_MASK_LSB_8_BITS;
-}
-
 /*
  * imx274_set_gain - Function called when setting gain
  * @priv: Pointer to device structure
@@ -1185,10 +1205,8 @@ static inline void imx274_calculate_gain_regs(struct reg_8 regs[2], u16 gain)
  */
 static int imx274_set_gain(struct stimx274 *priv, struct v4l2_ctrl *ctrl)
 {
-       struct reg_8 reg_list[2];
        int err;
        u32 gain, analog_gain, digital_gain, gain_reg;
-       int i;
 
        gain = (u32)(ctrl->val);
 
@@ -1229,14 +1247,10 @@ static int imx274_set_gain(struct stimx274 *priv, struct v4l2_ctrl *ctrl)
        if (gain_reg > IMX274_GAIN_REG_MAX)
                gain_reg = IMX274_GAIN_REG_MAX;
 
-       imx274_calculate_gain_regs(reg_list, (u16)gain_reg);
-
-       for (i = 0; i < ARRAY_SIZE(reg_list); i++) {
-               err = imx274_write_reg(priv, reg_list[i].addr,
-                                      reg_list[i].val);
-               if (err)
-                       goto fail;
-       }
+       err = imx274_write_mbreg(priv, IMX274_ANALOG_GAIN_ADDR_LSB, gain_reg,
+                                2);
+       if (err)
+               goto fail;
 
        if (IMX274_GAIN_CONST - gain_reg == 0) {
                err = -EINVAL;
@@ -1258,16 +1272,6 @@ fail:
        return err;
 }
 
-static inline void imx274_calculate_coarse_time_regs(struct reg_8 regs[2],
-                                                    u32 coarse_time)
-{
-       regs->addr = IMX274_SHR_REG_MSB;
-       regs->val = (coarse_time >> IMX274_SHIFT_8_BITS)
-                       & IMX274_MASK_LSB_8_BITS;
-       (regs + 1)->addr = IMX274_SHR_REG_LSB;
-       (regs + 1)->val = (coarse_time) & IMX274_MASK_LSB_8_BITS;
-}
-
 /*
  * imx274_set_coarse_time - Function called when setting SHR value
  * @priv: Pointer to device structure
@@ -1279,10 +1283,8 @@ static inline void imx274_calculate_coarse_time_regs(struct reg_8 regs[2],
  */
 static int imx274_set_coarse_time(struct stimx274 *priv, u32 *val)
 {
-       struct reg_8 reg_list[2];
        int err;
        u32 coarse_time, frame_length;
-       int i;
 
        coarse_time = *val;
 
@@ -1291,16 +1293,9 @@ static int imx274_set_coarse_time(struct stimx274 *priv, u32 *val)
        if (err)
                goto fail;
 
-       /* prepare SHR registers */
-       imx274_calculate_coarse_time_regs(reg_list, coarse_time);
-
-       /* write to SHR registers */
-       for (i = 0; i < ARRAY_SIZE(reg_list); i++) {
-               err = imx274_write_reg(priv, reg_list[i].addr,
-                                      reg_list[i].val);
-               if (err)
-                       goto fail;
-       }
+       err = imx274_write_mbreg(priv, IMX274_SHR_REG_LSB, coarse_time, 2);
+       if (err)
+               goto fail;
 
        *val = frame_length - coarse_time;
        return 0;
@@ -1429,19 +1424,6 @@ static int imx274_set_test_pattern(struct stimx274 *priv, int val)
        return err;
 }
 
-static inline void imx274_calculate_frame_length_regs(struct reg_8 regs[3],
-                                                     u32 frame_length)
-{
-       regs->addr = IMX274_VMAX_REG_1;
-       regs->val = (frame_length >> IMX274_SHIFT_16_BITS)
-                       & IMX274_MASK_LSB_4_BITS;
-       (regs + 1)->addr = IMX274_VMAX_REG_2;
-       (regs + 1)->val = (frame_length >> IMX274_SHIFT_8_BITS)
-                       & IMX274_MASK_LSB_8_BITS;
-       (regs + 2)->addr = IMX274_VMAX_REG_3;
-       (regs + 2)->val = (frame_length) & IMX274_MASK_LSB_8_BITS;
-}
-
 /*
  * imx274_set_frame_length - Function called when setting frame length
  * @priv: Pointer to device structure
@@ -1453,23 +1435,17 @@ static inline void imx274_calculate_frame_length_regs(struct reg_8 regs[3],
  */
 static int imx274_set_frame_length(struct stimx274 *priv, u32 val)
 {
-       struct reg_8 reg_list[3];
        int err;
        u32 frame_length;
-       int i;
 
        dev_dbg(&priv->client->dev, "%s : input length = %d\n",
                __func__, val);
 
        frame_length = (u32)val;
 
-       imx274_calculate_frame_length_regs(reg_list, frame_length);
-       for (i = 0; i < ARRAY_SIZE(reg_list); i++) {
-               err = imx274_write_reg(priv, reg_list[i].addr,
-                                      reg_list[i].val);
-               if (err)
-                       goto fail;
-       }
+       err = imx274_write_mbreg(priv, IMX274_VMAX_REG_3, frame_length, 3);
+       if (err)
+               goto fail;
 
        return 0;