drm/tegra: sor - Use bits-per-color from panel

This change uses the value of bits-per-color from panel to remove one
more hardcoded value.
Signed-off-by: NStéphane Marchesin <marcheu@chromium.org>
Signed-off-by: NThierry Reding <treding@nvidia.com>

drivers/gpu/drm/tegra/sor.c

@@ -525,7 +525,7 @@ static int tegra_output_sor_enable(struct tegra_output *output)
 		dev_err(sor->dev, "failed to set safe parent clock: %d\n", err);
 
 	memset(&config, 0, sizeof(config));
-	config.bits_per_pixel = 24; /* XXX: don't hardcode? */
+	config.bits_per_pixel = output->connector.display_info.bpc * 3;
 
 	err = tegra_sor_calc_config(sor, mode, &config, &link);
 	if (err < 0)