[v6] media: ov08x40: Reduce start streaming time

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 | 1211 ++---------------------------------
 1 file changed, 59 insertions(+), 1152 deletions(-)
  

On (24/01/24 22:43), Chen, Jason Z wrote:
> 
> 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>

FWIW
Reviewed-by: Sergey Senozhatsky <senozhatsky@chromium.org>
  

Hi Jason,

Thanks for the update.

On Wed, Jan 24, 2024 at 10:43:01PM +0800, Chen, Jason Z 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 | 1211 ++---------------------------------
>  1 file changed, 59 insertions(+), 1152 deletions(-)
> 
> diff --git a/drivers/media/i2c/ov08x40.c b/drivers/media/i2c/ov08x40.c
> index ddcb4b6848b..01cf3b8be6c 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},
> -	{0x5be1, 0x75},
> -	{0x5be2, 0x75},
> -	{0x5be3, 0x75},
> -	{0x5be4, 0x75},
> -	{0x5be5, 0x75},
> -	{0x5be6, 0x75},
> -	{0x5be7, 0x75},
> -	{0x5be8, 0x75},
> -	{0x5be9, 0x75},
> -	{0x5bea, 0x75},
> -	{0x5beb, 0x75},
> -	{0x5bec, 0x75},
> -	{0x5bed, 0x75},
> -	{0x5bee, 0x75},
> -	{0x5bef, 0x75},
> -	{0x5bf0, 0x75},
> -	{0x5bf1, 0x75},
> -	{0x5bf2, 0x75},
> -	{0x5bf3, 0x75},
> -	{0x5bf4, 0x75},
> -	{0x5bf5, 0x75},
> -	{0x5bf6, 0x75},
> -	{0x5bf7, 0x75},
> -	{0x5bf8, 0x75},
> -	{0x5bf9, 0x75},
> -	{0x5bfa, 0x75},
> -	{0x5bfb, 0x75},
> -	{0x5bfc, 0x75},
> -	{0x5bfd, 0x75},
> -	{0x5bfe, 0x75},
> -	{0x5bff, 0x75},
> -	{0x5c00, 0x75},
> -	{0x5c01, 0x75},
> -	{0x5c02, 0x75},
> -	{0x5c03, 0x75},
> -	{0x5c04, 0x75},
> -	{0x5c05, 0x75},
> -	{0x5c06, 0x75},
> -	{0x5c07, 0x75},
> -	{0x5c08, 0x75},
> -	{0x5c09, 0x75},
> -	{0x5c0a, 0x75},
> -	{0x5c0b, 0x75},
> -	{0x5c0c, 0x75},
> -	{0x5c0d, 0x75},
> -	{0x5c0e, 0x75},
> -	{0x5c0f, 0x75},
> -	{0x5c10, 0x75},
> -	{0x5c11, 0x75},
> -	{0x5c12, 0x75},
> -	{0x5c13, 0x75},
> -	{0x5c14, 0x75},
> -	{0x5c15, 0x75},
> -	{0x5c16, 0x75},
> -	{0x5c17, 0x75},
> -	{0x5c18, 0x75},
> -	{0x5c19, 0x75},
> -	{0x5c1a, 0x75},
> -	{0x5c1b, 0x75},
> -	{0x5c1c, 0x75},
> -	{0x5c1d, 0x75},
> -	{0x5c1e, 0x75},
> -	{0x5c1f, 0x75},
> -	{0x5c20, 0x75},
> -	{0x5c21, 0x75},
> -	{0x5c22, 0x75},
> -	{0x5c23, 0x75},
> -	{0x5c24, 0x75},
> -	{0x5c25, 0x75},
> -	{0x5c26, 0x75},
> -	{0x5c27, 0x75},
> -	{0x5c28, 0x75},
> -	{0x5c29, 0x75},
> -	{0x5c2a, 0x75},
> -	{0x5c2b, 0x75},
> -	{0x5c2c, 0x75},
> -	{0x5c2d, 0x75},
> -	{0x5c2e, 0x75},
> -	{0x5c2f, 0x75},
> -	{0x5c30, 0x75},
> -	{0x5c31, 0x75},
> -	{0x5c32, 0x75},
> -	{0x5c33, 0x75},
> -	{0x5c34, 0x75},
> -	{0x5c35, 0x75},
> -	{0x5c36, 0x75},
> -	{0x5c37, 0x75},
> -	{0x5c38, 0x75},
> -	{0x5c39, 0x75},
> -	{0x5c3a, 0x75},
> -	{0x5c3b, 0x75},
> -	{0x5c3c, 0x75},
> -	{0x5c3d, 0x75},
> -	{0x5c3e, 0x75},
> -	{0x5c3f, 0x75},
> -	{0x5c40, 0x75},
> -	{0x5c41, 0x75},
> -	{0x5c42, 0x75},
> -	{0x5c43, 0x75},
> -	{0x5c44, 0x75},
> -	{0x5c45, 0x75},
> -	{0x5c46, 0x75},
> -	{0x5c47, 0x75},
> -	{0x5c48, 0x75},
> -	{0x5c49, 0x75},
> -	{0x5c4a, 0x75},
> -	{0x5c4b, 0x75},
> -	{0x5c4c, 0x75},
> -	{0x5c4d, 0x75},
> -	{0x5c4e, 0x75},
> -	{0x5c4f, 0x75},
> -	{0x5c50, 0x75},
> -	{0x5c51, 0x75},
> -	{0x5c52, 0x75},
> -	{0x5c53, 0x75},
> -	{0x5c54, 0x75},
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> -	{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");

This is a quite useless messages, there are no messages printed on other
successful writes either. I'll remove while applying the patch.

> +
> +	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 +1827,22 @@ 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);
> +		if (ret == 0)
> +			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)