diff mbox series

[v3] media: ov08x40: Reduce start streaming time

Message ID 20240123093648.285711-1-jason.z.chen@intel.com (mailing list archive)
State Superseded
Delegated to: Sakari Ailus
Headers
Series [v3] media: ov08x40: Reduce start streaming time |

Commit Message

Chen, Jason Z Jan. 23, 2024, 9:36 a.m. UTC 
  From: Jason Chen <jason.z.chen@intel.com>

Because video duration involves calculating the streaming time, and i2c
communication incurs too many XTALK register settings every 4 bytes with
i2c START and STOP.

So we have opted switch to the i2c burst method.
This method involves writing the XTALK registers in the order of
the register block.

The start streaming time can be reduced from around 400ms to 150ms

Signed-off-by: Jason Chen <jason.z.chen@intel.com>
---
 drivers/media/i2c/ov08x40.c | 1207 ++---------------------------------
 1 file changed, 55 insertions(+), 1152 deletions(-)

Comments

Tomasz Figa Jan. 23, 2024, 10:03 a.m. UTC | #1 
On Tue, Jan 23, 2024 at 6:37 PM Chen, Jason Z <jason.z.chen@intel.com> wrote:
>
> From: Jason Chen <jason.z.chen@intel.com>
>
> Because video duration involves calculating the streaming time, and i2c
> communication incurs too many XTALK register settings every 4 bytes with
> i2c START and STOP.
>
> So we have opted switch to the i2c burst method.
> This method involves writing the XTALK registers in the order of
> the register block.
>
> The start streaming time can be reduced from around 400ms to 150ms
>
> Signed-off-by: Jason Chen <jason.z.chen@intel.com>
> ---
>  drivers/media/i2c/ov08x40.c | 1207 ++---------------------------------
>  1 file changed, 55 insertions(+), 1152 deletions(-)
>
> diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c
> index ddcb4b6848b..7b09f405fc5 100644
> --- a/drivers/media/i2c/ov08x40.c
> +++ b/drivers/media/i2c/ov08x40.c
[snip]
> +static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg,
> +                                  u16 last_reg,  u8 val)
> +{
> +       struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd);
> +       struct i2c_msg msgs;
> +       __be16 reg_addr_be = cpu_to_be16(first_reg);
> +       size_t i, num_regs;
> +       int ret;
> +
> +       num_regs = last_reg - first_reg + 1;
> +       msgs.addr = client->addr;
> +       msgs.flags = 0;
> +       msgs.len = 2 + num_regs;
> +       msgs.buf = kmalloc(msgs.len, GFP_KERNEL);
> +       if (!msgs.buf)
> +               return -ENOMEM;
> +
> +       /* Set the register address to the first two bytes of the buffer */
> +       memcpy(msgs.buf, &reg_addr_be, 2);

nit: Wouldn't the code be much simpler to follow if rewritten as below?

msgs.buf[0] = first_reg >> 8;
msgs.buf[1] = first_reg & 0xff;

> +       for (i = 0; i < num_regs; ++i)
> +               msgs.buf[2 + i] = val;
> +
> +       ret = i2c_transfer(client->adapter, &msgs, 1);
> +
> +       kfree(msgs.buf);
> +
> +       if (ret != 1) {
> +               dev_err(&client->dev, "Failed %d regs transferred: %d\n", ret);
> +               return -EIO;
> +       }
> +
> +       dev_dbg(&client->dev, "I2C burst transfer succeeded\n");
> +
> +       return 0;
> +}
> +
>  /* Write registers up to 4 at a time */
>  static int ov08x40_write_reg(struct ov08x40 *ov08x,
>                              u16 reg, u32 len, u32 __val)
> @@ -2936,6 +1826,19 @@ static int ov08x40_start_streaming(struct ov08x40 *ov08x)
>                 return ret;
>         }
>
> +       /* Use i2c burst to write register on full size registers */
> +       if (ov08x->cur_mode->exposure_shift == 1) {
> +               ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_A,
> +                                             OV08X40_REG_XTALK_LAST_A, 0x75);
> +               ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_B,
> +                                             OV08X40_REG_XTALK_LAST_B, 0x75);
> +       }

Hmm, if we only need to set these if exposure_shift is 1, don't we
need to somehow "unset" them if the mode exposure_shift != 1?

Best regards,
Tomasz
Sakari Ailus Jan. 23, 2024, 10:16 a.m. UTC | #2 
Hi Tomasz,

On Tue, Jan 23, 2024 at 07:03:49PM +0900, Tomasz Figa wrote:
> On Tue, Jan 23, 2024 at 6:37 PM Chen, Jason Z <jason.z.chen@intel.com> wrote:
> >
> > From: Jason Chen <jason.z.chen@intel.com>
> >
> > Because video duration involves calculating the streaming time, and i2c
> > communication incurs too many XTALK register settings every 4 bytes with
> > i2c START and STOP.
> >
> > So we have opted switch to the i2c burst method.
> > This method involves writing the XTALK registers in the order of
> > the register block.
> >
> > The start streaming time can be reduced from around 400ms to 150ms
> >
> > Signed-off-by: Jason Chen <jason.z.chen@intel.com>
> > ---
> >  drivers/media/i2c/ov08x40.c | 1207 ++---------------------------------
> >  1 file changed, 55 insertions(+), 1152 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c
> > index ddcb4b6848b..7b09f405fc5 100644
> > --- a/drivers/media/i2c/ov08x40.c
> > +++ b/drivers/media/i2c/ov08x40.c
> [snip]
> > +static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg,
> > +                                  u16 last_reg,  u8 val)
> > +{
> > +       struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd);
> > +       struct i2c_msg msgs;
> > +       __be16 reg_addr_be = cpu_to_be16(first_reg);
> > +       size_t i, num_regs;
> > +       int ret;
> > +
> > +       num_regs = last_reg - first_reg + 1;
> > +       msgs.addr = client->addr;
> > +       msgs.flags = 0;
> > +       msgs.len = 2 + num_regs;
> > +       msgs.buf = kmalloc(msgs.len, GFP_KERNEL);
> > +       if (!msgs.buf)
> > +               return -ENOMEM;
> > +
> > +       /* Set the register address to the first two bytes of the buffer */
> > +       memcpy(msgs.buf, &reg_addr_be, 2);
> 
> nit: Wouldn't the code be much simpler to follow if rewritten as below?
> 
> msgs.buf[0] = first_reg >> 8;
> msgs.buf[1] = first_reg & 0xff;

Or... just put_unaligned_be16()?

> 
> > +       for (i = 0; i < num_regs; ++i)
> > +               msgs.buf[2 + i] = val;
> > +
> > +       ret = i2c_transfer(client->adapter, &msgs, 1);
> > +
> > +       kfree(msgs.buf);
> > +
> > +       if (ret != 1) {
> > +               dev_err(&client->dev, "Failed %d regs transferred: %d\n", ret);
> > +               return -EIO;
> > +       }
> > +
> > +       dev_dbg(&client->dev, "I2C burst transfer succeeded\n");
> > +
> > +       return 0;
> > +}
> > +
> >  /* Write registers up to 4 at a time */
> >  static int ov08x40_write_reg(struct ov08x40 *ov08x,
> >                              u16 reg, u32 len, u32 __val)
> > @@ -2936,6 +1826,19 @@ static int ov08x40_start_streaming(struct ov08x40 *ov08x)
> >                 return ret;
> >         }
> >
> > +       /* Use i2c burst to write register on full size registers */
> > +       if (ov08x->cur_mode->exposure_shift == 1) {
> > +               ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_A,
> > +                                             OV08X40_REG_XTALK_LAST_A, 0x75);
> > +               ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_B,
> > +                                             OV08X40_REG_XTALK_LAST_B, 0x75);
> > +       }
> 
> Hmm, if we only need to set these if exposure_shift is 1, don't we
> need to somehow "unset" them if the mode exposure_shift != 1?

I recall the driver powers the sensor off every time streaming is stopped
(without pm_runtime_put_sync(), so it's not reliable)... that would be nice
to address as well, but outside the scope of this patch.
Chen, Jason Z Jan. 23, 2024, 2:48 p.m. UTC | #3 
Thanks for the review, Sakari and Tomasz.

-----Original Message-----
From: Sakari Ailus <sakari.ailus@linux.intel.com> 
Sent: Tuesday, January 23, 2024 6:16 PM
To: Tomasz Figa <tfiga@chromium.org>
Cc: Chen, Jason Z <jason.z.chen@intel.com>; bingbu.cao@linux.intel.com; linux-media@vger.kernel.org; Yeh, Andy <andy.yeh@intel.com>; Zhang, Qingwu <qingwu.zhang@intel.com>; senozhatsky@chromium.org
Subject: Re: [PATCH v3] media: ov08x40: Reduce start streaming time

Hi Tomasz,

On Tue, Jan 23, 2024 at 07:03:49PM +0900, Tomasz Figa wrote:
> On Tue, Jan 23, 2024 at 6:37 PM Chen, Jason Z <jason.z.chen@intel.com> wrote:
> >
> > From: Jason Chen <jason.z.chen@intel.com>
> >
> > Because video duration involves calculating the streaming time, and 
> > i2c communication incurs too many XTALK register settings every 4 
> > bytes with i2c START and STOP.
> >
> > So we have opted switch to the i2c burst method.
> > This method involves writing the XTALK registers in the order of the 
> > register block.
> >
> > The start streaming time can be reduced from around 400ms to 150ms
> >
> > Signed-off-by: Jason Chen <jason.z.chen@intel.com>
> > ---
> >  drivers/media/i2c/ov08x40.c | 1207 
> > ++---------------------------------
> >  1 file changed, 55 insertions(+), 1152 deletions(-)
> >
> > diff --git a/drivers/media/i2c/ov08x40.c 
> > b/drivers/media/i2c/ov08x40.c index ddcb4b6848b..7b09f405fc5 100644
> > --- a/drivers/media/i2c/ov08x40.c
> > +++ b/drivers/media/i2c/ov08x40.c
> [snip]
> > +static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg,
> > +                                  u16 last_reg,  u8 val) {
> > +       struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd);
> > +       struct i2c_msg msgs;
> > +       __be16 reg_addr_be = cpu_to_be16(first_reg);
> > +       size_t i, num_regs;
> > +       int ret;
> > +
> > +       num_regs = last_reg - first_reg + 1;
> > +       msgs.addr = client->addr;
> > +       msgs.flags = 0;
> > +       msgs.len = 2 + num_regs;
> > +       msgs.buf = kmalloc(msgs.len, GFP_KERNEL);
> > +       if (!msgs.buf)
> > +               return -ENOMEM;
> > +
> > +       /* Set the register address to the first two bytes of the buffer */
> > +       memcpy(msgs.buf, &reg_addr_be, 2);
> 
> nit: Wouldn't the code be much simpler to follow if rewritten as below?
> 
> msgs.buf[0] = first_reg >> 8;
> msgs.buf[1] = first_reg & 0xff;

>Or... just put_unaligned_be16()?
Done

> 
> > +       for (i = 0; i < num_regs; ++i)
> > +               msgs.buf[2 + i] = val;
> > +
> > +       ret = i2c_transfer(client->adapter, &msgs, 1);
> > +
> > +       kfree(msgs.buf);
> > +
> > +       if (ret != 1) {
> > +               dev_err(&client->dev, "Failed %d regs transferred: %d\n", ret);
> > +               return -EIO;
> > +       }
> > +
> > +       dev_dbg(&client->dev, "I2C burst transfer succeeded\n");
> > +
> > +       return 0;
> > +}
> > +
> >  /* Write registers up to 4 at a time */  static int 
> > ov08x40_write_reg(struct ov08x40 *ov08x,
> >                              u16 reg, u32 len, u32 __val) @@ -2936,6 
> > +1826,19 @@ static int ov08x40_start_streaming(struct ov08x40 *ov08x)
> >                 return ret;
> >         }
> >
> > +       /* Use i2c burst to write register on full size registers */
> > +       if (ov08x->cur_mode->exposure_shift == 1) {
> > +               ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_A,
> > +                                             OV08X40_REG_XTALK_LAST_A, 0x75);
> > +               ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_B,
> > +                                             OV08X40_REG_XTALK_LAST_B, 0x75);
> > +       }
> 
> Hmm, if we only need to set these if exposure_shift is 1, don't we 
> need to somehow "unset" them if the mode exposure_shift != 1?

>I recall the driver powers the sensor off every time streaming is stopped (without pm_runtime_put_sync(), so it's not reliable)... that would be nice to address as well, but outside the scope of this patch.

No need, because when starting streaming with the binning mode, it will flush with the `mode_1928x1208_regs`.
This is just for full-size register settings.

I have checked the i2c functionality as well, and it does work to set the register well.


--
Regards,

Sakari Ailus
diff mbox series

Patch

diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c
index ddcb4b6848b..7b09f405fc5 100644
--- a/drivers/media/i2c/ov08x40.c
+++ b/drivers/media/i2c/ov08x40.c
@@ -95,6 +95,12 @@ 
 /* Vertical Window Offset */
 #define OV08X40_REG_V_WIN_OFFSET	0x3813
 
+/* Burst Register */
+#define OV08X40_REG_XTALK_FIRST_A	0x5a80
+#define OV08X40_REG_XTALK_LAST_A	0x5b9f
+#define OV08X40_REG_XTALK_FIRST_B	0x5bc0
+#define OV08X40_REG_XTALK_LAST_B	0x5f1f
+
 enum {
 	OV08X40_LINK_FREQ_400MHZ_INDEX,
 };
@@ -682,1158 +688,6 @@  static const struct ov08x40_reg mode_3856x2416_regs[] = {
 	{0x3502, 0x10},
 	{0x3508, 0x0f},
 	{0x3509, 0x80},
-	{0x5a80, 0x75},
-	{0x5a81, 0x75},
-	{0x5a82, 0x75},
-	{0x5a83, 0x75},
-	{0x5a84, 0x75},
-	{0x5a85, 0x75},
-	{0x5a86, 0x75},
-	{0x5a87, 0x75},
-	{0x5a88, 0x75},
-	{0x5a89, 0x75},
-	{0x5a8a, 0x75},
-	{0x5a8b, 0x75},
-	{0x5a8c, 0x75},
-	{0x5a8d, 0x75},
-	{0x5a8e, 0x75},
-	{0x5a8f, 0x75},
-	{0x5a90, 0x75},
-	{0x5a91, 0x75},
-	{0x5a92, 0x75},
-	{0x5a93, 0x75},
-	{0x5a94, 0x75},
-	{0x5a95, 0x75},
-	{0x5a96, 0x75},
-	{0x5a97, 0x75},
-	{0x5a98, 0x75},
-	{0x5a99, 0x75},
-	{0x5a9a, 0x75},
-	{0x5a9b, 0x75},
-	{0x5a9c, 0x75},
-	{0x5a9d, 0x75},
-	{0x5a9e, 0x75},
-	{0x5a9f, 0x75},
-	{0x5aa0, 0x75},
-	{0x5aa1, 0x75},
-	{0x5aa2, 0x75},
-	{0x5aa3, 0x75},
-	{0x5aa4, 0x75},
-	{0x5aa5, 0x75},
-	{0x5aa6, 0x75},
-	{0x5aa7, 0x75},
-	{0x5aa8, 0x75},
-	{0x5aa9, 0x75},
-	{0x5aaa, 0x75},
-	{0x5aab, 0x75},
-	{0x5aac, 0x75},
-	{0x5aad, 0x75},
-	{0x5aae, 0x75},
-	{0x5aaf, 0x75},
-	{0x5ab0, 0x75},
-	{0x5ab1, 0x75},
-	{0x5ab2, 0x75},
-	{0x5ab3, 0x75},
-	{0x5ab4, 0x75},
-	{0x5ab5, 0x75},
-	{0x5ab6, 0x75},
-	{0x5ab7, 0x75},
-	{0x5ab8, 0x75},
-	{0x5ab9, 0x75},
-	{0x5aba, 0x75},
-	{0x5abb, 0x75},
-	{0x5abc, 0x75},
-	{0x5abd, 0x75},
-	{0x5abe, 0x75},
-	{0x5abf, 0x75},
-	{0x5ac0, 0x75},
-	{0x5ac1, 0x75},
-	{0x5ac2, 0x75},
-	{0x5ac3, 0x75},
-	{0x5ac4, 0x75},
-	{0x5ac5, 0x75},
-	{0x5ac6, 0x75},
-	{0x5ac7, 0x75},
-	{0x5ac8, 0x75},
-	{0x5ac9, 0x75},
-	{0x5aca, 0x75},
-	{0x5acb, 0x75},
-	{0x5acc, 0x75},
-	{0x5acd, 0x75},
-	{0x5ace, 0x75},
-	{0x5acf, 0x75},
-	{0x5ad0, 0x75},
-	{0x5ad1, 0x75},
-	{0x5ad2, 0x75},
-	{0x5ad3, 0x75},
-	{0x5ad4, 0x75},
-	{0x5ad5, 0x75},
-	{0x5ad6, 0x75},
-	{0x5ad7, 0x75},
-	{0x5ad8, 0x75},
-	{0x5ad9, 0x75},
-	{0x5ada, 0x75},
-	{0x5adb, 0x75},
-	{0x5adc, 0x75},
-	{0x5add, 0x75},
-	{0x5ade, 0x75},
-	{0x5adf, 0x75},
-	{0x5ae0, 0x75},
-	{0x5ae1, 0x75},
-	{0x5ae2, 0x75},
-	{0x5ae3, 0x75},
-	{0x5ae4, 0x75},
-	{0x5ae5, 0x75},
-	{0x5ae6, 0x75},
-	{0x5ae7, 0x75},
-	{0x5ae8, 0x75},
-	{0x5ae9, 0x75},
-	{0x5aea, 0x75},
-	{0x5aeb, 0x75},
-	{0x5aec, 0x75},
-	{0x5aed, 0x75},
-	{0x5aee, 0x75},
-	{0x5aef, 0x75},
-	{0x5af0, 0x75},
-	{0x5af1, 0x75},
-	{0x5af2, 0x75},
-	{0x5af3, 0x75},
-	{0x5af4, 0x75},
-	{0x5af5, 0x75},
-	{0x5af6, 0x75},
-	{0x5af7, 0x75},
-	{0x5af8, 0x75},
-	{0x5af9, 0x75},
-	{0x5afa, 0x75},
-	{0x5afb, 0x75},
-	{0x5afc, 0x75},
-	{0x5afd, 0x75},
-	{0x5afe, 0x75},
-	{0x5aff, 0x75},
-	{0x5b00, 0x75},
-	{0x5b01, 0x75},
-	{0x5b02, 0x75},
-	{0x5b03, 0x75},
-	{0x5b04, 0x75},
-	{0x5b05, 0x75},
-	{0x5b06, 0x75},
-	{0x5b07, 0x75},
-	{0x5b08, 0x75},
-	{0x5b09, 0x75},
-	{0x5b0a, 0x75},
-	{0x5b0b, 0x75},
-	{0x5b0c, 0x75},
-	{0x5b0d, 0x75},
-	{0x5b0e, 0x75},
-	{0x5b0f, 0x75},
-	{0x5b10, 0x75},
-	{0x5b11, 0x75},
-	{0x5b12, 0x75},
-	{0x5b13, 0x75},
-	{0x5b14, 0x75},
-	{0x5b15, 0x75},
-	{0x5b16, 0x75},
-	{0x5b17, 0x75},
-	{0x5b18, 0x75},
-	{0x5b19, 0x75},
-	{0x5b1a, 0x75},
-	{0x5b1b, 0x75},
-	{0x5b1c, 0x75},
-	{0x5b1d, 0x75},
-	{0x5b1e, 0x75},
-	{0x5b1f, 0x75},
-	{0x5b20, 0x75},
-	{0x5b21, 0x75},
-	{0x5b22, 0x75},
-	{0x5b23, 0x75},
-	{0x5b24, 0x75},
-	{0x5b25, 0x75},
-	{0x5b26, 0x75},
-	{0x5b27, 0x75},
-	{0x5b28, 0x75},
-	{0x5b29, 0x75},
-	{0x5b2a, 0x75},
-	{0x5b2b, 0x75},
-	{0x5b2c, 0x75},
-	{0x5b2d, 0x75},
-	{0x5b2e, 0x75},
-	{0x5b2f, 0x75},
-	{0x5b30, 0x75},
-	{0x5b31, 0x75},
-	{0x5b32, 0x75},
-	{0x5b33, 0x75},
-	{0x5b34, 0x75},
-	{0x5b35, 0x75},
-	{0x5b36, 0x75},
-	{0x5b37, 0x75},
-	{0x5b38, 0x75},
-	{0x5b39, 0x75},
-	{0x5b3a, 0x75},
-	{0x5b3b, 0x75},
-	{0x5b3c, 0x75},
-	{0x5b3d, 0x75},
-	{0x5b3e, 0x75},
-	{0x5b3f, 0x75},
-	{0x5b40, 0x75},
-	{0x5b41, 0x75},
-	{0x5b42, 0x75},
-	{0x5b43, 0x75},
-	{0x5b44, 0x75},
-	{0x5b45, 0x75},
-	{0x5b46, 0x75},
-	{0x5b47, 0x75},
-	{0x5b48, 0x75},
-	{0x5b49, 0x75},
-	{0x5b4a, 0x75},
-	{0x5b4b, 0x75},
-	{0x5b4c, 0x75},
-	{0x5b4d, 0x75},
-	{0x5b4e, 0x75},
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-	{0x5d86, 0x75},
-	{0x5d87, 0x75},
-	{0x5d88, 0x75},
-	{0x5d89, 0x75},
-	{0x5d8a, 0x75},
-	{0x5d8b, 0x75},
-	{0x5d8c, 0x75},
-	{0x5d8d, 0x75},
-	{0x5d8e, 0x75},
-	{0x5d8f, 0x75},
-	{0x5d90, 0x75},
-	{0x5d91, 0x75},
-	{0x5d92, 0x75},
-	{0x5d93, 0x75},
-	{0x5d94, 0x75},
-	{0x5d95, 0x75},
-	{0x5d96, 0x75},
-	{0x5d97, 0x75},
-	{0x5d98, 0x75},
-	{0x5d99, 0x75},
-	{0x5d9a, 0x75},
-	{0x5d9b, 0x75},
-	{0x5d9c, 0x75},
-	{0x5d9d, 0x75},
-	{0x5d9e, 0x75},
-	{0x5d9f, 0x75},
-	{0x5da0, 0x75},
-	{0x5da1, 0x75},
-	{0x5da2, 0x75},
-	{0x5da3, 0x75},
-	{0x5da4, 0x75},
-	{0x5da5, 0x75},
-	{0x5da6, 0x75},
-	{0x5da7, 0x75},
-	{0x5da8, 0x75},
-	{0x5da9, 0x75},
-	{0x5daa, 0x75},
-	{0x5dab, 0x75},
-	{0x5dac, 0x75},
-	{0x5dad, 0x75},
-	{0x5dae, 0x75},
-	{0x5daf, 0x75},
-	{0x5db0, 0x75},
-	{0x5db1, 0x75},
-	{0x5db2, 0x75},
-	{0x5db3, 0x75},
-	{0x5db4, 0x75},
-	{0x5db5, 0x75},
-	{0x5db6, 0x75},
-	{0x5db7, 0x75},
-	{0x5db8, 0x75},
-	{0x5db9, 0x75},
-	{0x5dba, 0x75},
-	{0x5dbb, 0x75},
-	{0x5dbc, 0x75},
-	{0x5dbd, 0x75},
-	{0x5dbe, 0x75},
-	{0x5dbf, 0x75},
-	{0x5dc0, 0x75},
-	{0x5dc1, 0x75},
-	{0x5dc2, 0x75},
-	{0x5dc3, 0x75},
-	{0x5dc4, 0x75},
-	{0x5dc5, 0x75},
-	{0x5dc6, 0x75},
-	{0x5dc7, 0x75},
-	{0x5dc8, 0x75},
-	{0x5dc9, 0x75},
-	{0x5dca, 0x75},
-	{0x5dcb, 0x75},
-	{0x5dcc, 0x75},
-	{0x5dcd, 0x75},
-	{0x5dce, 0x75},
-	{0x5dcf, 0x75},
-	{0x5dd0, 0x75},
-	{0x5dd1, 0x75},
-	{0x5dd2, 0x75},
-	{0x5dd3, 0x75},
-	{0x5dd4, 0x75},
-	{0x5dd5, 0x75},
-	{0x5dd6, 0x75},
-	{0x5dd7, 0x75},
-	{0x5dd8, 0x75},
-	{0x5dd9, 0x75},
-	{0x5dda, 0x75},
-	{0x5ddb, 0x75},
-	{0x5ddc, 0x75},
-	{0x5ddd, 0x75},
-	{0x5dde, 0x75},
-	{0x5ddf, 0x75},
-	{0x5de0, 0x75},
-	{0x5de1, 0x75},
-	{0x5de2, 0x75},
-	{0x5de3, 0x75},
-	{0x5de4, 0x75},
-	{0x5de5, 0x75},
-	{0x5de6, 0x75},
-	{0x5de7, 0x75},
-	{0x5de8, 0x75},
-	{0x5de9, 0x75},
-	{0x5dea, 0x75},
-	{0x5deb, 0x75},
-	{0x5dec, 0x75},
-	{0x5ded, 0x75},
-	{0x5dee, 0x75},
-	{0x5def, 0x75},
-	{0x5df0, 0x75},
-	{0x5df1, 0x75},
-	{0x5df2, 0x75},
-	{0x5df3, 0x75},
-	{0x5df4, 0x75},
-	{0x5df5, 0x75},
-	{0x5df6, 0x75},
-	{0x5df7, 0x75},
-	{0x5df8, 0x75},
-	{0x5df9, 0x75},
-	{0x5dfa, 0x75},
-	{0x5dfb, 0x75},
-	{0x5dfc, 0x75},
-	{0x5dfd, 0x75},
-	{0x5dfe, 0x75},
-	{0x5dff, 0x75},
-	{0x5e00, 0x75},
-	{0x5e01, 0x75},
-	{0x5e02, 0x75},
-	{0x5e03, 0x75},
-	{0x5e04, 0x75},
-	{0x5e05, 0x75},
-	{0x5e06, 0x75},
-	{0x5e07, 0x75},
-	{0x5e08, 0x75},
-	{0x5e09, 0x75},
-	{0x5e0a, 0x75},
-	{0x5e0b, 0x75},
-	{0x5e0c, 0x75},
-	{0x5e0d, 0x75},
-	{0x5e0e, 0x75},
-	{0x5e0f, 0x75},
-	{0x5e10, 0x75},
-	{0x5e11, 0x75},
-	{0x5e12, 0x75},
-	{0x5e13, 0x75},
-	{0x5e14, 0x75},
-	{0x5e15, 0x75},
-	{0x5e16, 0x75},
-	{0x5e17, 0x75},
-	{0x5e18, 0x75},
-	{0x5e19, 0x75},
-	{0x5e1a, 0x75},
-	{0x5e1b, 0x75},
-	{0x5e1c, 0x75},
-	{0x5e1d, 0x75},
-	{0x5e1e, 0x75},
-	{0x5e1f, 0x75},
-	{0x5e20, 0x75},
-	{0x5e21, 0x75},
-	{0x5e22, 0x75},
-	{0x5e23, 0x75},
-	{0x5e24, 0x75},
-	{0x5e25, 0x75},
-	{0x5e26, 0x75},
-	{0x5e27, 0x75},
-	{0x5e28, 0x75},
-	{0x5e29, 0x75},
-	{0x5e2a, 0x75},
-	{0x5e2b, 0x75},
-	{0x5e2c, 0x75},
-	{0x5e2d, 0x75},
-	{0x5e2e, 0x75},
-	{0x5e2f, 0x75},
-	{0x5e30, 0x75},
-	{0x5e31, 0x75},
-	{0x5e32, 0x75},
-	{0x5e33, 0x75},
-	{0x5e34, 0x75},
-	{0x5e35, 0x75},
-	{0x5e36, 0x75},
-	{0x5e37, 0x75},
-	{0x5e38, 0x75},
-	{0x5e39, 0x75},
-	{0x5e3a, 0x75},
-	{0x5e3b, 0x75},
-	{0x5e3c, 0x75},
-	{0x5e3d, 0x75},
-	{0x5e3e, 0x75},
-	{0x5e3f, 0x75},
-	{0x5e40, 0x75},
-	{0x5e41, 0x75},
-	{0x5e42, 0x75},
-	{0x5e43, 0x75},
-	{0x5e44, 0x75},
-	{0x5e45, 0x75},
-	{0x5e46, 0x75},
-	{0x5e47, 0x75},
-	{0x5e48, 0x75},
-	{0x5e49, 0x75},
-	{0x5e4a, 0x75},
-	{0x5e4b, 0x75},
-	{0x5e4c, 0x75},
-	{0x5e4d, 0x75},
-	{0x5e4e, 0x75},
-	{0x5e4f, 0x75},
-	{0x5e50, 0x75},
-	{0x5e51, 0x75},
-	{0x5e52, 0x75},
-	{0x5e53, 0x75},
-	{0x5e54, 0x75},
-	{0x5e55, 0x75},
-	{0x5e56, 0x75},
-	{0x5e57, 0x75},
-	{0x5e58, 0x75},
-	{0x5e59, 0x75},
-	{0x5e5a, 0x75},
-	{0x5e5b, 0x75},
-	{0x5e5c, 0x75},
-	{0x5e5d, 0x75},
-	{0x5e5e, 0x75},
-	{0x5e5f, 0x75},
-	{0x5e60, 0x75},
-	{0x5e61, 0x75},
-	{0x5e62, 0x75},
-	{0x5e63, 0x75},
-	{0x5e64, 0x75},
-	{0x5e65, 0x75},
-	{0x5e66, 0x75},
-	{0x5e67, 0x75},
-	{0x5e68, 0x75},
-	{0x5e69, 0x75},
-	{0x5e6a, 0x75},
-	{0x5e6b, 0x75},
-	{0x5e6c, 0x75},
-	{0x5e6d, 0x75},
-	{0x5e6e, 0x75},
-	{0x5e6f, 0x75},
-	{0x5e70, 0x75},
-	{0x5e71, 0x75},
-	{0x5e72, 0x75},
-	{0x5e73, 0x75},
-	{0x5e74, 0x75},
-	{0x5e75, 0x75},
-	{0x5e76, 0x75},
-	{0x5e77, 0x75},
-	{0x5e78, 0x75},
-	{0x5e79, 0x75},
-	{0x5e7a, 0x75},
-	{0x5e7b, 0x75},
-	{0x5e7c, 0x75},
-	{0x5e7d, 0x75},
-	{0x5e7e, 0x75},
-	{0x5e7f, 0x75},
-	{0x5e80, 0x75},
-	{0x5e81, 0x75},
-	{0x5e82, 0x75},
-	{0x5e83, 0x75},
-	{0x5e84, 0x75},
-	{0x5e85, 0x75},
-	{0x5e86, 0x75},
-	{0x5e87, 0x75},
-	{0x5e88, 0x75},
-	{0x5e89, 0x75},
-	{0x5e8a, 0x75},
-	{0x5e8b, 0x75},
-	{0x5e8c, 0x75},
-	{0x5e8d, 0x75},
-	{0x5e8e, 0x75},
-	{0x5e8f, 0x75},
-	{0x5e90, 0x75},
-	{0x5e91, 0x75},
-	{0x5e92, 0x75},
-	{0x5e93, 0x75},
-	{0x5e94, 0x75},
-	{0x5e95, 0x75},
-	{0x5e96, 0x75},
-	{0x5e97, 0x75},
-	{0x5e98, 0x75},
-	{0x5e99, 0x75},
-	{0x5e9a, 0x75},
-	{0x5e9b, 0x75},
-	{0x5e9c, 0x75},
-	{0x5e9d, 0x75},
-	{0x5e9e, 0x75},
-	{0x5e9f, 0x75},
-	{0x5ea0, 0x75},
-	{0x5ea1, 0x75},
-	{0x5ea2, 0x75},
-	{0x5ea3, 0x75},
-	{0x5ea4, 0x75},
-	{0x5ea5, 0x75},
-	{0x5ea6, 0x75},
-	{0x5ea7, 0x75},
-	{0x5ea8, 0x75},
-	{0x5ea9, 0x75},
-	{0x5eaa, 0x75},
-	{0x5eab, 0x75},
-	{0x5eac, 0x75},
-	{0x5ead, 0x75},
-	{0x5eae, 0x75},
-	{0x5eaf, 0x75},
-	{0x5eb0, 0x75},
-	{0x5eb1, 0x75},
-	{0x5eb2, 0x75},
-	{0x5eb3, 0x75},
-	{0x5eb4, 0x75},
-	{0x5eb5, 0x75},
-	{0x5eb6, 0x75},
-	{0x5eb7, 0x75},
-	{0x5eb8, 0x75},
-	{0x5eb9, 0x75},
-	{0x5eba, 0x75},
-	{0x5ebb, 0x75},
-	{0x5ebc, 0x75},
-	{0x5ebd, 0x75},
-	{0x5ebe, 0x75},
-	{0x5ebf, 0x75},
-	{0x5ec0, 0x75},
-	{0x5ec1, 0x75},
-	{0x5ec2, 0x75},
-	{0x5ec3, 0x75},
-	{0x5ec4, 0x75},
-	{0x5ec5, 0x75},
-	{0x5ec6, 0x75},
-	{0x5ec7, 0x75},
-	{0x5ec8, 0x75},
-	{0x5ec9, 0x75},
-	{0x5eca, 0x75},
-	{0x5ecb, 0x75},
-	{0x5ecc, 0x75},
-	{0x5ecd, 0x75},
-	{0x5ece, 0x75},
-	{0x5ecf, 0x75},
-	{0x5ed0, 0x75},
-	{0x5ed1, 0x75},
-	{0x5ed2, 0x75},
-	{0x5ed3, 0x75},
-	{0x5ed4, 0x75},
-	{0x5ed5, 0x75},
-	{0x5ed6, 0x75},
-	{0x5ed7, 0x75},
-	{0x5ed8, 0x75},
-	{0x5ed9, 0x75},
-	{0x5eda, 0x75},
-	{0x5edb, 0x75},
-	{0x5edc, 0x75},
-	{0x5edd, 0x75},
-	{0x5ede, 0x75},
-	{0x5edf, 0x75},
-	{0x5ee0, 0x75},
-	{0x5ee1, 0x75},
-	{0x5ee2, 0x75},
-	{0x5ee3, 0x75},
-	{0x5ee4, 0x75},
-	{0x5ee5, 0x75},
-	{0x5ee6, 0x75},
-	{0x5ee7, 0x75},
-	{0x5ee8, 0x75},
-	{0x5ee9, 0x75},
-	{0x5eea, 0x75},
-	{0x5eeb, 0x75},
-	{0x5eec, 0x75},
-	{0x5eed, 0x75},
-	{0x5eee, 0x75},
-	{0x5eef, 0x75},
-	{0x5ef0, 0x75},
-	{0x5ef1, 0x75},
-	{0x5ef2, 0x75},
-	{0x5ef3, 0x75},
-	{0x5ef4, 0x75},
-	{0x5ef5, 0x75},
-	{0x5ef6, 0x75},
-	{0x5ef7, 0x75},
-	{0x5ef8, 0x75},
-	{0x5ef9, 0x75},
-	{0x5efa, 0x75},
-	{0x5efb, 0x75},
-	{0x5efc, 0x75},
-	{0x5efd, 0x75},
-	{0x5efe, 0x75},
-	{0x5eff, 0x75},
-	{0x5f00, 0x75},
-	{0x5f01, 0x75},
-	{0x5f02, 0x75},
-	{0x5f03, 0x75},
-	{0x5f04, 0x75},
-	{0x5f05, 0x75},
-	{0x5f06, 0x75},
-	{0x5f07, 0x75},
-	{0x5f08, 0x75},
-	{0x5f09, 0x75},
-	{0x5f0a, 0x75},
-	{0x5f0b, 0x75},
-	{0x5f0c, 0x75},
-	{0x5f0d, 0x75},
-	{0x5f0e, 0x75},
-	{0x5f0f, 0x75},
-	{0x5f10, 0x75},
-	{0x5f11, 0x75},
-	{0x5f12, 0x75},
-	{0x5f13, 0x75},
-	{0x5f14, 0x75},
-	{0x5f15, 0x75},
-	{0x5f16, 0x75},
-	{0x5f17, 0x75},
-	{0x5f18, 0x75},
-	{0x5f19, 0x75},
-	{0x5f1a, 0x75},
-	{0x5f1b, 0x75},
-	{0x5f1c, 0x75},
-	{0x5f1d, 0x75},
-	{0x5f1e, 0x75},
-	{0x5f1f, 0x75},
 };
 
 static const struct ov08x40_reg mode_1928x1208_regs[] = {
@@ -2493,6 +1347,42 @@  static int ov08x40_read_reg(struct ov08x40 *ov08x,
 	return 0;
 }
 
+static int ov08x40_burst_fill_regs(struct ov08x40 *ov08x, u16 first_reg,
+				   u16 last_reg,  u8 val)
+{
+	struct i2c_client *client = v4l2_get_subdevdata(&ov08x->sd);
+	struct i2c_msg msgs;
+	__be16 reg_addr_be = cpu_to_be16(first_reg);
+	size_t i, num_regs;
+	int ret;
+
+	num_regs = last_reg - first_reg + 1;
+	msgs.addr = client->addr;
+	msgs.flags = 0;
+	msgs.len = 2 + num_regs;
+	msgs.buf = kmalloc(msgs.len, GFP_KERNEL);
+	if (!msgs.buf)
+		return -ENOMEM;
+
+	/* Set the register address to the first two bytes of the buffer */
+	memcpy(msgs.buf, &reg_addr_be, 2);
+	for (i = 0; i < num_regs; ++i)
+		msgs.buf[2 + i] = val;
+
+	ret = i2c_transfer(client->adapter, &msgs, 1);
+
+	kfree(msgs.buf);
+
+	if (ret != 1) {
+		dev_err(&client->dev, "Failed %d regs transferred: %d\n", ret);
+		return -EIO;
+	}
+
+	dev_dbg(&client->dev, "I2C burst transfer succeeded\n");
+
+	return 0;
+}
+
 /* Write registers up to 4 at a time */
 static int ov08x40_write_reg(struct ov08x40 *ov08x,
 			     u16 reg, u32 len, u32 __val)
@@ -2936,6 +1826,19 @@  static int ov08x40_start_streaming(struct ov08x40 *ov08x)
 		return ret;
 	}
 
+	/* Use i2c burst to write register on full size registers */
+	if (ov08x->cur_mode->exposure_shift == 1) {
+		ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_A,
+					      OV08X40_REG_XTALK_LAST_A, 0x75);
+		ret = ov08x40_burst_fill_regs(ov08x, OV08X40_REG_XTALK_FIRST_B,
+					      OV08X40_REG_XTALK_LAST_B, 0x75);
+	}
+
+	if (ret) {
+		dev_err(&client->dev, "%s failed to set regs\n", __func__);
+		return ret;
+	}
+
 	/* Apply customized values from user */
 	ret =  __v4l2_ctrl_handler_setup(ov08x->sd.ctrl_handler);
 	if (ret)