For now the amount requested is based solely on the current mode's refresh
rate.
Signed-off-by: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxx>
---
v4: * Use vertical refresh rate when calculating the bandwidth requirement
v3: * Fixed the bandwidth calculation, and have the units be mbps
---
drivers/gpu/drm/tegra/dc.c | 15 +++++++++++++++
drivers/gpu/drm/tegra/drm.h | 3 +++
2 files changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index 6553fd2..8a3fee8 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -9,6 +9,7 @@
#include <linux/clk.h>
#include <linux/debugfs.h>
+#include <linux/pm_qos.h>
#include <linux/reset.h>
#include "dc.h"
@@ -753,6 +754,8 @@ static void tegra_crtc_disable(struct drm_crtc *crtc)
}
drm_vblank_off(drm, dc->pipe);
+
+ pm_qos_update_request(&dc->qos_request, PM_QOS_DEFAULT_VALUE);
}
static bool tegra_crtc_mode_fixup(struct drm_crtc *crtc,
@@ -839,6 +842,7 @@ 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);
@@ -879,6 +883,12 @@ static int tegra_crtc_mode_set(struct drm_crtc *crtc,
if (err < 0)
dev_err(dc->dev, "failed to enable root plane\n");
+ bandwidth = window.stride[0] * window.dst.h * 8;
+ bandwidth *= drm_mode_vrefresh(mode);
+ bandwidth /= 1024 * 1024;
+
+ pm_qos_update_request(&dc->qos_request, bandwidth);
+
return 0;
}
@@ -1499,6 +1509,9 @@ static int tegra_dc_probe(struct platform_device *pdev)
return err;
}
+ pm_qos_add_request(&dc->qos_request, PM_QOS_MEMORY_BANDWIDTH,
+ PM_QOS_DEFAULT_VALUE);
+
platform_set_drvdata(pdev, dc);
return 0;
@@ -1509,6 +1522,8 @@ static int tegra_dc_remove(struct platform_device *pdev)
struct tegra_dc *dc = platform_get_drvdata(pdev);
int err;
+ pm_qos_remove_request(&dc->qos_request);
+
err = host1x_client_unregister(&dc->client);
if (err < 0) {
dev_err(&pdev->dev, "failed to unregister host1x client: %d\n",
diff --git a/drivers/gpu/drm/tegra/drm.h b/drivers/gpu/drm/tegra/drm.h
index e89c70f..a99e533d 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -12,6 +12,7 @@
#include <uapi/drm/tegra_drm.h>
#include <linux/host1x.h>
+#include <linux/pm_qos.h>
#include <drm/drmP.h>
#include <drm/drm_crtc_helper.h>
@@ -120,6 +121,8 @@ struct tegra_dc {
struct drm_pending_vblank_event *event;
const struct tegra_dc_soc_info *soc;
+
+ struct pm_qos_request qos_request;
};
static inline struct tegra_dc *
--
1.9.3
--
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