Reserve bandwidth for the scanout to make sure EMC is not reducing DRAM performance too far, which would cause visual corruption.
Signed-off-by: Lucas Stach <[email protected]> --- drivers/gpu/drm/tegra/dc.c | 11 +++++++++++ 1 Datei geändert, 11 Zeilen hinzugefügt(+) diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index 0744103..8f32ebc 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -12,6 +12,7 @@ #include <linux/module.h> #include <linux/of.h> #include <linux/platform_device.h> +#include <memory/tegra_emc_performance.h> #include <mach/clk.h> @@ -269,6 +270,16 @@ static int tegra_crtc_mode_set(struct drm_crtc *crtc, tegra_dc_writel(dc, 0xff00, DC_WIN_BLEND_NOKEY); tegra_dc_writel(dc, 0xff00, DC_WIN_BLEND_1WIN); + /* + * Let EMC know the bandwidth requirements of this mode. + * Calculation is naive but works for now. We have to revisit this once + * we support planes and dpms. + */ + value = mode->hdisplay * mode->vdisplay * bpp * drm_mode_vrefresh(mode); + tegra_emc_request_bandwidth(dc->pipe ? + TEGRA_EMC_SC_DCB : TEGRA_EMC_SC_DC, + value); + return 0; } -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
