Re: [PATCH 1/2] drm/i915/dsi: improve dphy param limits logging

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Thu, Apr 19, 2018 at 11:59:39AM +0300, Jani Nikula wrote:
> Move the limit checks near the calculations for each field, and actually
> log the values that exceed limits.
> 
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_dsi_vbt.c | 34 ++++++++++++++++++----------------
>  1 file changed, 18 insertions(+), 16 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dsi_vbt.c b/drivers/gpu/drm/i915/intel_dsi_vbt.c
> index 91c07b0c8db9..4d6ffa7b3e7b 100644
> --- a/drivers/gpu/drm/i915/intel_dsi_vbt.c
> +++ b/drivers/gpu/drm/i915/intel_dsi_vbt.c
> @@ -647,6 +647,11 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
>  	/* prepare count */
>  	prepare_cnt = DIV_ROUND_UP(ths_prepare_ns * ui_den, ui_num * mul);
>  
> +	if (prepare_cnt > PREPARE_CNT_MAX) {
> +		DRM_DEBUG_KMS("prepare count too high %u\n", prepare_cnt);
> +		prepare_cnt = PREPARE_CNT_MAX;
> +	}
> +
>  	/* exit zero count */
>  	exit_zero_cnt = DIV_ROUND_UP(
>  				(ths_prepare_hszero - ths_prepare_ns) * ui_den,
> @@ -662,32 +667,29 @@ bool intel_dsi_vbt_init(struct intel_dsi *intel_dsi, u16 panel_id)
>  	if (exit_zero_cnt < (55 * ui_den / ui_num) && (55 * ui_den) % ui_num)
>  		exit_zero_cnt += 1;
>  
> +	if (exit_zero_cnt > EXIT_ZERO_CNT_MAX) {
> +		DRM_DEBUG_KMS("exit zero count too high %u\n", exit_zero_cnt);
> +		exit_zero_cnt = EXIT_ZERO_CNT_MAX;
> +	}
> +
>  	/* clk zero count */
>  	clk_zero_cnt = DIV_ROUND_UP(
>  				(tclk_prepare_clkzero -	ths_prepare_ns)
>  				* ui_den, ui_num * mul);
>  
> +	if (clk_zero_cnt > CLK_ZERO_CNT_MAX) {
> +		DRM_DEBUG_KMS("clock zero count too high %u\n", clk_zero_cnt);
> +		clk_zero_cnt = CLK_ZERO_CNT_MAX;
> +	}
> +
>  	/* trail count */
>  	tclk_trail_ns = max(mipi_config->tclk_trail, mipi_config->ths_trail);
>  	trail_cnt = DIV_ROUND_UP(tclk_trail_ns * ui_den, ui_num * mul);
>  
> -	if (prepare_cnt > PREPARE_CNT_MAX ||
> -		exit_zero_cnt > EXIT_ZERO_CNT_MAX ||
> -		clk_zero_cnt > CLK_ZERO_CNT_MAX ||
> -		trail_cnt > TRAIL_CNT_MAX)
> -		DRM_DEBUG_DRIVER("Values crossing maximum limits, restricting to max values\n");
> -
> -	if (prepare_cnt > PREPARE_CNT_MAX)
> -		prepare_cnt = PREPARE_CNT_MAX;
> -
> -	if (exit_zero_cnt > EXIT_ZERO_CNT_MAX)
> -		exit_zero_cnt = EXIT_ZERO_CNT_MAX;
> -
> -	if (clk_zero_cnt > CLK_ZERO_CNT_MAX)
> -		clk_zero_cnt = CLK_ZERO_CNT_MAX;
> -
> -	if (trail_cnt > TRAIL_CNT_MAX)
> +	if (trail_cnt > TRAIL_CNT_MAX) {
> +		DRM_DEBUG_KMS("trail count too high %u\n", trail_cnt);
>  		trail_cnt = TRAIL_CNT_MAX;
> +	}
>  
>  	/* B080 */
>  	intel_dsi->dphy_reg = exit_zero_cnt << 24 | trail_cnt << 16 |
> -- 
> 2.11.0

-- 
Ville Syrjälä
Intel
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