In order to prevent timeouts and stalls in the pipeline, the core clock needs to be maxed at 500MHz during a modeset on the BCM2711.
Signed-off-by: Maxime Ripard maxime@cerno.tech --- drivers/gpu/drm/vc4/vc4_drv.h | 2 ++ drivers/gpu/drm/vc4/vc4_hvs.c | 9 +++++++++ drivers/gpu/drm/vc4/vc4_kms.c | 7 +++++++ 3 files changed, 18 insertions(+)
diff --git a/drivers/gpu/drm/vc4/vc4_drv.h b/drivers/gpu/drm/vc4/vc4_drv.h index 7da417feff5a..4fd6f72dec56 100644 --- a/drivers/gpu/drm/vc4/vc4_drv.h +++ b/drivers/gpu/drm/vc4/vc4_drv.h @@ -323,6 +323,8 @@ struct vc4_hvs { void __iomem *regs; u32 __iomem *dlist;
+ struct clk *core_clk; + /* Memory manager for CRTCs to allocate space in the display * list. Units are dwords. */ diff --git a/drivers/gpu/drm/vc4/vc4_hvs.c b/drivers/gpu/drm/vc4/vc4_hvs.c index 0fe4758de03a..f4942667355b 100644 --- a/drivers/gpu/drm/vc4/vc4_hvs.c +++ b/drivers/gpu/drm/vc4/vc4_hvs.c @@ -19,6 +19,7 @@ * each CRTC. */
+#include <linux/clk.h> #include <linux/component.h> #include <linux/platform_device.h>
@@ -241,6 +242,14 @@ static int vc4_hvs_bind(struct device *dev, struct device *master, void *data) hvs->regset.regs = hvs_regs; hvs->regset.nregs = ARRAY_SIZE(hvs_regs);
+ if (hvs->hvs5) { + hvs->core_clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(hvs->core_clk)) { + dev_err(&pdev->dev, "Couldn't get core clock\n"); + return PTR_ERR(hvs->core_clk); + } + } + if (!hvs->hvs5) hvs->dlist = hvs->regs + SCALER_DLIST_START; else diff --git a/drivers/gpu/drm/vc4/vc4_kms.c b/drivers/gpu/drm/vc4/vc4_kms.c index 71e7211a5fb9..851f0740b260 100644 --- a/drivers/gpu/drm/vc4/vc4_kms.c +++ b/drivers/gpu/drm/vc4/vc4_kms.c @@ -11,6 +11,8 @@ * crtc, HDMI encoder). */
+#include <linux/clk.h> + #include <drm/drm_atomic.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc.h> @@ -149,6 +151,7 @@ vc4_atomic_complete_commit(struct drm_atomic_state *state) { struct drm_device *dev = state->dev; struct vc4_dev *vc4 = to_vc4_dev(dev); + struct vc4_hvs *hvs = vc4->hvs; struct vc4_crtc *vc4_crtc; int i;
@@ -160,6 +163,8 @@ vc4_atomic_complete_commit(struct drm_atomic_state *state) vc4_hvs_mask_underrun(dev, vc4_crtc->channel); }
+ clk_set_rate(hvs->core_clk, 500000000); + drm_atomic_helper_wait_for_fences(dev, state, false);
drm_atomic_helper_wait_for_dependencies(state); @@ -182,6 +187,8 @@ vc4_atomic_complete_commit(struct drm_atomic_state *state)
drm_atomic_helper_commit_cleanup_done(state);
+ clk_set_rate(hvs->core_clk, 200000000); + drm_atomic_state_put(state);
up(&vc4->async_modeset);