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Subject[RFC v2 2/3] drm/tegra: Request memory bandwidth for the display controller
Date
For now the amount requested is based solely on the current mode's refresh
rate.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
---
drivers/gpu/drm/tegra/dc.c | 11 +++++++++++
drivers/gpu/drm/tegra/drm.h | 2 ++
2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c
index ef40381..4bcf09b 100644
--- a/drivers/gpu/drm/tegra/dc.c
+++ b/drivers/gpu/drm/tegra/dc.c
@@ -683,6 +683,8 @@ 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,
@@ -769,6 +771,7 @@ 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 +812,9 @@ 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;
+ pm_qos_update_request(&dc->qos_request, bandwidth);
+
return 0;
}

@@ -1407,6 +1413,9 @@ 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;
@@ -1417,6 +1426,8 @@ 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 6b8fe9d..6029693 100644
--- a/drivers/gpu/drm/tegra/drm.h
+++ b/drivers/gpu/drm/tegra/drm.h
@@ -116,6 +116,8 @@ 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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