Re: [PATCH 1/1] drm/mgag200: Added resolution and bandwidth limits for various G200e products.

[J L <jlemire@matrox.com>]

On 13-06-17 09:19 AM, Julia Lemire wrote:
> +static uint32_t mga_vga_calculate_mode_bandwidth(struct drm_display_mode * mode,
> +                                                       int bits_per_pixel)
> +{
> +       uint64_t active_area, total_area, pixels_per_second;
> +       uint64_t bytes_per_pixel = (bits_per_pixel + 7) / 8;
> +
> +       if(!mode->htotal || !mode->vtotal || !mode->clock)
> +               return 0;
> +
> +       active_area = mode->hdisplay * mode->vdisplay;
> +       total_area = mode->htotal * mode->vtotal;
> +       pixels_per_second = active_area * mode->clock * 1000 / total_area;
> +       return (uint32_t)(pixels_per_second * bytes_per_pixel * 100 / (1024));
> +}
I found a bug while testing this on a 32-bit machine linked to the 
64-bit division.  Sorry.

-- 
Julia Lemire Jr. Eng./Ing.
Software Designer
Matrox Graphics Inc.
Phone : 514 822-6000 x7010
Email :julia.lemire@matrox.com