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@xxxxxxxxxx
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