Re: [PATCH libdrm] modetest: Use floating vrefresh while dumping mode

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

On Tue, Nov 26, 2019 at 07:03:58AM -0800, Devarsh Thakkar wrote:
> Add inline function to derive floating value of vertical
> refresh rate from pixel clock, horizontal total size and
> vertical total size.
> 
> Use this function to find suitable mode having vrefresh
> value which is matching with user provided vrefresh value.
> 
> If user doesn't provide any vrefresh value in args then
> update vertical refresh rate value in pipe args using this
> function so that it will be used for printing floating vrefresh
> while dumping mode.
> 
> This will give more accurate picture to user for available modes
> differentiated by floating vertical refresh rate and help user
> select more appropriate mode using suitable refresh rate value.
> 
> Signed-off-by: Devarsh Thakkar <devarsh.thakkar@xilinx.com>
> ---
>  tests/modetest/modetest.c | 36 ++++++++++++++++++++++--------------
>  1 file changed, 22 insertions(+), 14 deletions(-)
> 
> diff --git a/tests/modetest/modetest.c b/tests/modetest/modetest.c
> index b4edfcb..80cf076 100644
> --- a/tests/modetest/modetest.c
> +++ b/tests/modetest/modetest.c
> @@ -133,6 +133,12 @@ static inline int64_t U642I64(uint64_t val)
>  	return (int64_t)*((int64_t *)&val);
>  }
>  
> +static inline float get_floating_vrefresh(drmModeModeInfo *mode)

Drop the 'inline'. I'd call it just mode_vrefresh() or somehting like
that.

> +{
> +	return  mode->clock * 1000.00
> +			/ (mode->htotal * mode->vtotal);
> +}
> +
>  #define bit_name_fn(res)					\
>  const char * res##_str(int type) {				\
>  	unsigned int i;						\
> @@ -210,9 +216,9 @@ static void dump_encoders(struct device *dev)
>  
>  static void dump_mode(drmModeModeInfo *mode)
>  {
> -	printf("  %s %d %d %d %d %d %d %d %d %d %d",
> +	printf("  %s %.2f %d %d %d %d %d %d %d %d %d",
>  	       mode->name,
> -	       mode->vrefresh,
> +	       get_floating_vrefresh(mode),
>  	       mode->hdisplay,
>  	       mode->hsync_start,
>  	       mode->hsync_end,
> @@ -823,12 +829,11 @@ struct plane_arg {
>  
>  static drmModeModeInfo *
>  connector_find_mode(struct device *dev, uint32_t con_id, const char *mode_str,
> -	const float vrefresh)
> +	float *vrefresh)
>  {
>  	drmModeConnector *connector;
>  	drmModeModeInfo *mode;
>  	int i;
> -	float mode_vrefresh;
>  
>  	connector = get_connector_by_id(dev, con_id);
>  	if (!connector || !connector->count_modes)
> @@ -837,16 +842,19 @@ connector_find_mode(struct device *dev, uint32_t con_id, const char *mode_str,
>  	for (i = 0; i < connector->count_modes; i++) {
>  		mode = &connector->modes[i];
>  		if (!strcmp(mode->name, mode_str)) {
> -			/* If the vertical refresh frequency is not specified then return the
> -			 * first mode that match with the name. Else, return the mode that match
> -			 * the name and the specified vertical refresh frequency.
> +			/* If the vertical refresh frequency is not specified
> +			 * then return the first mode that match with the name
> +			 * and update corresponding vrefresh in pipe_arg.
> +			 * Else, return the mode that match the name and
> +			 * the specified vertical refresh frequency.
>  			 */
> -			mode_vrefresh = mode->clock * 1000.00
> -					/ (mode->htotal * mode->vtotal);
> -			if (vrefresh == 0)
> +			if (*vrefresh == 0) {
> +				*vrefresh = get_floating_vrefresh(mode);
>  				return mode;
> -			else if (fabs(mode_vrefresh - vrefresh) < 0.005)
> +			} else if (fabs(get_floating_vrefresh(mode)
> +				   - *vrefresh) < 0.005) {
>  				return mode;
> +			}
>  		}
>  	}
>  
> @@ -909,11 +917,11 @@ static int pipe_find_crtc_and_mode(struct device *dev, struct pipe_arg *pipe)
>  
>  	for (i = 0; i < (int)pipe->num_cons; i++) {
>  		mode = connector_find_mode(dev, pipe->con_ids[i],
> -					   pipe->mode_str, pipe->vrefresh);
> +					   pipe->mode_str, &pipe->vrefresh);
>  		if (mode == NULL) {
>  			fprintf(stderr,
> -				"failed to find mode \"%s\" for connector %s\n",
> -				pipe->mode_str, pipe->cons[i]);
> +			"failed to find mode \"%s-%.2fHz\" for connector %s\n",
> +			 pipe->mode_str, pipe->vrefresh, pipe->cons[i]);

We didn't find any mode so having connector_find_mode() update
vrefresh for us is nonsense.

>  			return -EINVAL;
>  		}
>  	}
> -- 
> 2.7.4

-- 
Ville Syrjälä
Intel
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