[RFC PATCH 3/4] drm/tegra: Request memory bandwidth for the display controller
From: Tomeu Vizoso <hidden>
Date: 2014-06-16 13:36:07
Also in:
dri-devel, linux-devicetree, linux-pm, linux-tegra, lkml
Subsystem:
drm drivers, drm drivers for nvidia tegra, the rest · Maintainers:
David Airlie, Simona Vetter, Thierry Reding, Mikko Perttunen, Linus Torvalds
Request it based solely on the current mode's refresh rate. More accurate requirements can be requested in future patches. Signed-off-by: Tomeu Vizoso <redacted> --- drivers/gpu/drm/tegra/dc.c | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index ef40381..6739d69 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c@@ -10,6 +10,7 @@ #include <linux/clk.h> #include <linux/debugfs.h> #include <linux/reset.h> +#include <linux/platform_data/tegra_emc.h> #include "dc.h" #include "drm.h"
@@ -683,6 +684,8 @@ static void tegra_crtc_disable(struct drm_crtc *crtc) } drm_vblank_off(drm, dc->pipe); + + tegra124_emc_reserve_bandwidth(TEGRA_EMC_CONSUMER_DISP1, 0); } static bool tegra_crtc_mode_fixup(struct drm_crtc *crtc,
@@ -769,6 +772,7 @@ static int tegra_crtc_mode_set(struct drm_crtc *crtc, struct tegra_dc *dc = to_tegra_dc(crtc); struct tegra_dc_window window; u32 value; + unsigned long bandwidth; int err; drm_vblank_pre_modeset(crtc->dev, dc->pipe);
@@ -809,6 +813,11 @@ static int tegra_crtc_mode_set(struct drm_crtc *crtc, if (err < 0) dev_err(dc->dev, "failed to enable root plane\n"); + bandwidth = mode->clock * window.bits_per_pixel / 8; + err = tegra124_emc_reserve_bandwidth(TEGRA_EMC_CONSUMER_DISP1, bandwidth); + if (err) + dev_err(dc->dev, "failed to reserve EMC bandwidth: %d\n", err); + return 0; }
--
1.9.3