diff mbox series

[v5] media: ov08x40: Reduce start streaming time

Message ID 20240124033154.834344-1-jason.z.chen@intel.com (mailing list archive)
State Superseded
Delegated to: Sakari Ailus
Headers
Series [v5] media: ov08x40: Reduce start streaming time |

Commit Message

Chen, Jason Z Jan. 24, 2024, 3:31 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 | 1208 ++---------------------------------
 1 file changed, 56 insertions(+), 1152 deletions(-)

Comments

Tomasz Figa Jan. 24, 2024, 4:41 a.m. UTC | #1 
On Wed, Jan 24, 2024 at 12:33 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 | 1208 ++---------------------------------
>  1 file changed, 56 insertions(+), 1152 deletions(-)

Thanks for addressing the comments!

Reviewed-by: Tomasz Figa <tfiga@chromium.org>

Best regards,
Tomasz
Sergey Senozhatsky Jan. 24, 2024, 7:18 a.m. UTC | #2 
On (24/01/24 11:31), Chen, Jason Z wrote:
[..]
>  /* Write registers up to 4 at a time */
>  static int ov08x40_write_reg(struct ov08x40 *ov08x,
>  			     u16 reg, u32 len, u32 __val)
> @@ -2936,6 +1827,19 @@ 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 we have to be pedantic then second ov08x40_burst_fill_regs()
overwrites whatever first ov08x40_burst_fill_regs() returns.

But it's unlikely to be a real problem.
Tomasz Figa Jan. 24, 2024, 7:27 a.m. UTC | #3 
On Wed, Jan 24, 2024 at 4:18 PM Sergey Senozhatsky
<senozhatsky@chromium.org> wrote:
>
> On (24/01/24 11:31), Chen, Jason Z wrote:
> [..]
> >  /* Write registers up to 4 at a time */
> >  static int ov08x40_write_reg(struct ov08x40 *ov08x,
> >                            u16 reg, u32 len, u32 __val)
> > @@ -2936,6 +1827,19 @@ 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 we have to be pedantic then second ov08x40_burst_fill_regs()
> overwrites whatever first ov08x40_burst_fill_regs() returns.
>
> But it's unlikely to be a real problem.

Hmm, good point. I guess in theory we could have a situation when the
first write fails and the second succeeds and no error is returned
ultimately... I guess I'll leave the final call on this one to Sakari,
as the maintainer. :)

Best regards,
Tomasz
Sakari Ailus Jan. 24, 2024, 11:10 a.m. UTC | #4 
On Wed, Jan 24, 2024 at 04:27:51PM +0900, Tomasz Figa wrote:
> On Wed, Jan 24, 2024 at 4:18 PM Sergey Senozhatsky
> <senozhatsky@chromium.org> wrote:
> >
> > On (24/01/24 11:31), Chen, Jason Z wrote:
> > [..]
> > >  /* Write registers up to 4 at a time */
> > >  static int ov08x40_write_reg(struct ov08x40 *ov08x,
> > >                            u16 reg, u32 len, u32 __val)
> > > @@ -2936,6 +1827,19 @@ 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 we have to be pedantic then second ov08x40_burst_fill_regs()
> > overwrites whatever first ov08x40_burst_fill_regs() returns.
> >
> > But it's unlikely to be a real problem.
> 
> Hmm, good point. I guess in theory we could have a situation when the
> first write fails and the second succeeds and no error is returned
> ultimately... I guess I'll leave the final call on this one to Sakari,
> as the maintainer. :)

It's a bug, isn't it?
Chen, Jason Z Jan. 24, 2024, 2:36 p.m. UTC | #5 
-----Original Message-----
From: Sakari Ailus <sakari.ailus@linux.intel.com> 
Sent: Wednesday, January 24, 2024 7:10 PM
To: Tomasz Figa <tfiga@chromium.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>; 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>
Subject: Re: [PATCH v5] media: ov08x40: Reduce start streaming time

On Wed, Jan 24, 2024 at 04:27:51PM +0900, Tomasz Figa wrote:
> On Wed, Jan 24, 2024 at 4:18 PM Sergey Senozhatsky 
> <senozhatsky@chromium.org> wrote:
> >
> > On (24/01/24 11:31), Chen, Jason Z wrote:
> > [..]
> > >  /* Write registers up to 4 at a time */  static int 
> > > ov08x40_write_reg(struct ov08x40 *ov08x,
> > >                            u16 reg, u32 len, u32 __val) @@ -2936,6 
> > > +1827,19 @@ 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 we have to be pedantic then second ov08x40_burst_fill_regs() 
> > overwrites whatever first ov08x40_burst_fill_regs() returns.
> >
> > But it's unlikely to be a real problem.
> 
> Hmm, good point. I guess in theory we could have a situation when the 
> first write fails and the second succeeds and no error is returned 
> ultimately... I guess I'll leave the final call on this one to Sakari, 
> as the maintainer. :)

>It's a bug, isn't it?

Yeah, thanks for pointing that out, Sergey.
Let me provide an update.

--
Sakari Ailus
diff mbox series

Patch

diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c
index ddcb4b6848b..aaa454d2ad0 100644
--- a/drivers/media/i2c/ov08x40.c
+++ b/drivers/media/i2c/ov08x40.c
@@ -1,6 +1,7 @@ 
 // SPDX-License-Identifier: GPL-2.0
 // Copyright (c) 2022 Intel Corporation.
 
+#include <asm-generic/unaligned.h>
 #include <linux/acpi.h>
 #include <linux/i2c.h>
 #include <linux/module.h>
@@ -95,6 +96,12 @@ 
 /* 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 +689,6 @@  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},
-	{0x5b4f, 0x75},
-	{0x5b50, 0x75},
-	{0x5b51, 0x75},
-	{0x5b52, 0x75},
-	{0x5b53, 0x75},
-	{0x5b54, 0x75},
-	{0x5b55, 0x75},
-	{0x5b56, 0x75},
-	{0x5b57, 0x75},
-	{0x5b58, 0x75},
-	{0x5b59, 0x75},
-	{0x5b5a, 0x75},
-	{0x5b5b, 0x75},
-	{0x5b5c, 0x75},
-	{0x5b5d, 0x75},
-	{0x5b5e, 0x75},
-	{0x5b5f, 0x75},
-	{0x5b60, 0x75},
-	{0x5b61, 0x75},
-	{0x5b62, 0x75},
-	{0x5b63, 0x75},
-	{0x5b64, 0x75},
-	{0x5b65, 0x75},
-	{0x5b66, 0x75},
-	{0x5b67, 0x75},
-	{0x5b68, 0x75},
-	{0x5b69, 0x75},
-	{0x5b6a, 0x75},
-	{0x5b6b, 0x75},
-	{0x5b6c, 0x75},
-	{0x5b6d, 0x75},
-	{0x5b6e, 0x75},
-	{0x5b6f, 0x75},
-	{0x5b70, 0x75},
-	{0x5b71, 0x75},
-	{0x5b72, 0x75},
-	{0x5b73, 0x75},
-	{0x5b74, 0x75},
-	{0x5b75, 0x75},
-	{0x5b76, 0x75},
-	{0x5b77, 0x75},
-	{0x5b78, 0x75},
-	{0x5b79, 0x75},
-	{0x5b7a, 0x75},
-	{0x5b7b, 0x75},
-	{0x5b7c, 0x75},
-	{0x5b7d, 0x75},
-	{0x5b7e, 0x75},
-	{0x5b7f, 0x75},
-	{0x5b80, 0x75},
-	{0x5b81, 0x75},
-	{0x5b82, 0x75},
-	{0x5b83, 0x75},
-	{0x5b84, 0x75},
-	{0x5b85, 0x75},
-	{0x5b86, 0x75},
-	{0x5b87, 0x75},
-	{0x5b88, 0x75},
-	{0x5b89, 0x75},
-	{0x5b8a, 0x75},
-	{0x5b8b, 0x75},
-	{0x5b8c, 0x75},
-	{0x5b8d, 0x75},
-	{0x5b8e, 0x75},
-	{0x5b8f, 0x75},
-	{0x5b90, 0x75},
-	{0x5b91, 0x75},
-	{0x5b92, 0x75},
-	{0x5b93, 0x75},
-	{0x5b94, 0x75},
-	{0x5b95, 0x75},
-	{0x5b96, 0x75},
-	{0x5b97, 0x75},
-	{0x5b98, 0x75},
-	{0x5b99, 0x75},
-	{0x5b9a, 0x75},
-	{0x5b9b, 0x75},
-	{0x5b9c, 0x75},
-	{0x5b9d, 0x75},
-	{0x5b9e, 0x75},
-	{0x5b9f, 0x75},
-	{0x5bc0, 0x75},
-	{0x5bc1, 0x75},
-	{0x5bc2, 0x75},
-	{0x5bc3, 0x75},
-	{0x5bc4, 0x75},
-	{0x5bc5, 0x75},
-	{0x5bc6, 0x75},
-	{0x5bc7, 0x75},
-	{0x5bc8, 0x75},
-	{0x5bc9, 0x75},
-	{0x5bca, 0x75},
-	{0x5bcb, 0x75},
-	{0x5bcc, 0x75},
-	{0x5bcd, 0x75},
-	{0x5bce, 0x75},
-	{0x5bcf, 0x75},
-	{0x5bd0, 0x75},
-	{0x5bd1, 0x75},
-	{0x5bd2, 0x75},
-	{0x5bd3, 0x75},
-	{0x5bd4, 0x75},
-	{0x5bd5, 0x75},
-	{0x5bd6, 0x75},
-	{0x5bd7, 0x75},
-	{0x5bd8, 0x75},
-	{0x5bd9, 0x75},
-	{0x5bda, 0x75},
-	{0x5bdb, 0x75},
-	{0x5bdc, 0x75},
-	{0x5bdd, 0x75},
-	{0x5bde, 0x75},
-	{0x5bdf, 0x75},
-	{0x5be0, 0x75},
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-	{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 +1348,42 @@  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;
+	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;
+
+	put_unaligned_be16(first_reg, msgs.buf);
+
+	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 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 +1827,19 @@  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)