[PATCH 6/8] video: tc358767: fix AUXDATAn registers access

[Lucas Stach]

Am Freitag, den 30.06.2017, 14:43 +0300 schrieb Andrey Gusakov:
> Also optimize DPCD writes

The word "also" in a commit message is a pretty strong hint that this
should be in a separate patch. The message of this commit should explain
what the fix for the AUXDATA access is without me needing to read the
code.

Regards,
Lucas
> ---
>  drivers/video/tc358767.c | 28 +++++++++++++++-------------
>  1 file changed, 15 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/video/tc358767.c b/drivers/video/tc358767.c
> index d2c94c616..1541b18c9 100644
> --- a/drivers/video/tc358767.c
> +++ b/drivers/video/tc358767.c
> @@ -35,6 +35,7 @@
>  #include <asm-generic/div64.h>
>  
>  #define DP_LINK_BW_SET			0x100
> +#define DP_ENHANCED_FRAME_EN		(1 << 7)
>  #define DP_TRAINING_PATTERN_SET		0x102
>  #define TRAINING_LANE0_SET		0x103
>  
> @@ -389,7 +390,7 @@ static int tc_aux_write(struct tc_data *tc, int reg, char *data, int size)
>  		i++;
>  		if (((i % 4) == 0) ||
>  		    (i == size)) {
> -			tc_write(DP0_AUXWDATA(i >> 2), tmp);
> +			tc_write(DP0_AUXWDATA((i - 1) >> 2), tmp);
>  			tmp = 0;
>  		}
>  	}
> @@ -477,7 +478,7 @@ static int tc_aux_i2c_write(struct tc_data *tc, struct i2c_msg *msg)
>  		i++;
>  		if (((i % 4) == 0) ||
>  		    (i == msg->len)) {
> -			tc_write(DP0_AUXWDATA(i >> 2), tmp);
> +			tc_write(DP0_AUXWDATA((i - 1) >> 2), tmp);
>  			tmp = 0;
>  		}
>  	}
> @@ -903,7 +904,7 @@ static int tc_main_link_setup(struct tc_data *tc)
>  	bool ready;
>  	u32 value;
>  	int ret;
> -	u8 tmp[8];
> +	u8 tmp[16];
>  
>  	/* display mode should be set at this point */
>  	if (!tc->mode)
> @@ -1004,21 +1005,22 @@ static int tc_main_link_setup(struct tc_data *tc)
>  	/* LANE_COUNT_SET */
>  	tmp[1] = tc->link.lanes;
>  	if (tc->link.enhanced)
> -		tmp[1] |= (1 << 7);
> -	ret = tc_aux_write(tc, DP_LINK_BW_SET, tmp, 2);
> -	if (ret)
> -		goto err_dpcd_write;
> +		tmp[1] |= DP_ENHANCED_FRAME_EN;
>  
> -	/* TRAINING_LANE0_SET .. TRAINING_LANE3_SET */
> -	tmp[0] = 0x00;
> -	tmp[1] = 0x00;
> +	/* TRAINING_PATTERN_SET */
>  	tmp[2] = 0x00;
> +	/* TRAINING_LANE0_SET .. TRAINING_LANE3_SET */
>  	tmp[3] = 0x00;
> +	tmp[4] = 0x00;
> +	tmp[5] = 0x00;
> +	tmp[6] = 0x00;
>  	/* DOWNSPREAD_CTRL */
> -	tmp[4] = tc->link.spread ? DP_SPREAD_AMP_0_5 : 0x00;
> +	tmp[7] = tc->link.spread ? DP_SPREAD_AMP_0_5 : 0x00;
>  	/* MAIN_LINK_CHANNEL_CODING_SET */
> -	tmp[5] = tc->link.coding8b10b ? DP_SET_ANSI_8B10B : 0x00;
> -	ret = tc_aux_write(tc, TRAINING_LANE0_SET, tmp, 6);
> +	tmp[8] = tc->link.coding8b10b ? DP_SET_ANSI_8B10B : 0x00;
> +
> +	/* DP_LINK_BW_SET .. MAIN_LINK_CHANNEL_CODING_SET */
> +	ret = tc_aux_write(tc, DP_LINK_BW_SET, tmp, 9);
>  	if (ret)
>  		goto err_dpcd_write;
>