[Intel-gfx] [PATCH 09/12] drm: Shrink drm_display_mode timings

[Sam Ravnborg]

Hi Ville.

On Wed, Feb 19, 2020 at 10:35:41PM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Store the timings (apart from the clock) as u16. The uapi mode
> struct already uses u16 for everything so using something bigger
> internally doesn't really help us.
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

While touchign this - have you cinsidered to put all the timing
fields in a dedicated struct - and then have two instanses of said
struct here?

Like:

/**
 * struct panel_timing - timing configuratio for a panel
 *
 * The timing is in khz and ...
 /*
struct panel_timing {
	/**
	 * @clock: Panel clock in khz
	 */
	int clock;

	/**
	 * @hdisplay: bla bla
	 */
	u16 hdisplay;
        u16 hsync_start;
        u16 hsync_end;
        u16 htotal;
        u16 hskew;
        u16 vdisplay;
        u16 vsync_start;
        u16 vsync_end;
        u16 vtotal;
        u16 vscan;
};


And then in drm_display_mode:

	/**
	 * @hw_timing: The timing for the panel
	 */
	struct panel_timing hw_timing;

	/**
	 * @calc_timing: The calculated timing
	 */
	struct panel_timing calc_timing;

Or something like that.
We could use the panel_timign struct in some other places I think.

	Sam

> ---
>  drivers/gpu/drm/drm_modes.c |  7 ------
>  include/drm/drm_modes.h     | 46 ++++++++++++++++++-------------------
>  2 files changed, 23 insertions(+), 30 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 0e7c9ba241c4..cc9fc52f9f7c 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -1917,13 +1917,6 @@ EXPORT_SYMBOL(drm_mode_create_from_cmdline_mode);
>  void drm_mode_convert_to_umode(struct drm_mode_modeinfo *out,
>  			       const struct drm_display_mode *in)
>  {
> -	WARN(in->hdisplay > USHRT_MAX || in->hsync_start > USHRT_MAX ||
> -	     in->hsync_end > USHRT_MAX || in->htotal > USHRT_MAX ||
> -	     in->hskew > USHRT_MAX || in->vdisplay > USHRT_MAX ||
> -	     in->vsync_start > USHRT_MAX || in->vsync_end > USHRT_MAX ||
> -	     in->vtotal > USHRT_MAX || in->vscan > USHRT_MAX,
> -	     "timing values too large for mode info\n");
> -
>  	out->clock = in->clock;
>  	out->hdisplay = in->hdisplay;
>  	out->hsync_start = in->hsync_start;
> diff --git a/include/drm/drm_modes.h b/include/drm/drm_modes.h
> index b28c0234fcd7..b585074945b5 100644
> --- a/include/drm/drm_modes.h
> +++ b/include/drm/drm_modes.h
> @@ -278,16 +278,16 @@ struct drm_display_mode {
>  	 * Pixel clock in kHz.
>  	 */
>  	int clock;		/* in kHz */
> -	int hdisplay;
> -	int hsync_start;
> -	int hsync_end;
> -	int htotal;
> -	int hskew;
> -	int vdisplay;
> -	int vsync_start;
> -	int vsync_end;
> -	int vtotal;
> -	int vscan;
> +	u16 hdisplay;
> +	u16 hsync_start;
> +	u16 hsync_end;
> +	u16 htotal;
> +	u16 hskew;
> +	u16 vdisplay;
> +	u16 vsync_start;
> +	u16 vsync_end;
> +	u16 vtotal;
> +	u16 vscan;
>  	/**
>  	 * @flags:
>  	 *
> @@ -356,19 +356,19 @@ struct drm_display_mode {
>  	 * difference is exactly a factor of 10.
>  	 */
>  	int crtc_clock;
> -	int crtc_hdisplay;
> -	int crtc_hblank_start;
> -	int crtc_hblank_end;
> -	int crtc_hsync_start;
> -	int crtc_hsync_end;
> -	int crtc_htotal;
> -	int crtc_hskew;
> -	int crtc_vdisplay;
> -	int crtc_vblank_start;
> -	int crtc_vblank_end;
> -	int crtc_vsync_start;
> -	int crtc_vsync_end;
> -	int crtc_vtotal;
> +	u16 crtc_hdisplay;
> +	u16 crtc_hblank_start;
> +	u16 crtc_hblank_end;
> +	u16 crtc_hsync_start;
> +	u16 crtc_hsync_end;
> +	u16 crtc_htotal;
> +	u16 crtc_hskew;
> +	u16 crtc_vdisplay;
> +	u16 crtc_vblank_start;
> +	u16 crtc_vblank_end;
> +	u16 crtc_vsync_start;
> +	u16 crtc_vsync_end;
> +	u16 crtc_vtotal;
>  
>  	/**
>  	 * @private_flags:
> -- 
> 2.24.1
> 
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