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https://github.com/openwrt/openwrt.git
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62b7f5931c
bcm2708: boot tested on RPi B+ v1.2
bcm2709: boot tested on RPi 3B v1.2 and RPi 4B v1.1 4G
bcm2710: boot tested on RPi 3B v1.2
bcm2711: boot tested on RPi 4B v1.1 4G
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
(cherry-picked from commit f07e572f64)
98 lines
2.7 KiB
Diff
98 lines
2.7 KiB
Diff
From 289c29b96fcc6cbe5c966fb0cc9e1bb8efbdd9dc Mon Sep 17 00:00:00 2001
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From: Dave Stevenson <dave.stevenson@raspberrypi.com>
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Date: Thu, 26 Mar 2020 15:32:19 +0000
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Subject: [PATCH] drm/vc4: Kick the core clock up during a mode change
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Experimental commit to kick the core clock up during mode
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switching. This makes mode switching far more reliable, and
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mimics what the firmware does.
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Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
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---
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arch/arm/boot/dts/bcm2711.dtsi | 1 +
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drivers/gpu/drm/vc4/vc4_drv.h | 2 ++
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drivers/gpu/drm/vc4/vc4_hvs.c | 7 +++++++
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drivers/gpu/drm/vc4/vc4_kms.c | 6 ++++++
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4 files changed, 16 insertions(+)
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--- a/arch/arm/boot/dts/bcm2711.dtsi
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+++ b/arch/arm/boot/dts/bcm2711.dtsi
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@@ -306,6 +306,7 @@
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};
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hvs@7e400000 {
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+ clocks = <&firmware_clocks 4>;
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interrupts = <GIC_SPI 97 IRQ_TYPE_LEVEL_HIGH>;
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};
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--- a/drivers/gpu/drm/vc4/vc4_drv.h
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+++ b/drivers/gpu/drm/vc4/vc4_drv.h
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@@ -326,6 +326,8 @@ struct vc4_hvs {
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void __iomem *regs;
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u32 __iomem *dlist;
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+ struct clk *core_clk;
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+
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/* Memory manager for CRTCs to allocate space in the display
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* list. Units are dwords.
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*/
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--- a/drivers/gpu/drm/vc4/vc4_hvs.c
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+++ b/drivers/gpu/drm/vc4/vc4_hvs.c
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@@ -19,6 +19,7 @@
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* each CRTC.
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*/
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+#include <linux/clk.h>
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#include <linux/component.h>
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#include <linux/platform_device.h>
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@@ -239,6 +240,12 @@ static int vc4_hvs_bind(struct device *d
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hvs->regset.regs = hvs_regs;
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hvs->regset.nregs = ARRAY_SIZE(hvs_regs);
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+ hvs->core_clk = devm_clk_get(&pdev->dev, NULL);
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+ if (IS_ERR(hvs->core_clk)) {
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+ dev_err(&pdev->dev, "Couldn't get core clock\n");
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+ return PTR_ERR(hvs->regs);
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+ }
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+
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hvs_version = readl(hvs->regs + SCALER_DISPLSTAT) >> 24;
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if (hvs_version >= 0x40)
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hvs->hvs5 = true;
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--- a/drivers/gpu/drm/vc4/vc4_kms.c
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+++ b/drivers/gpu/drm/vc4/vc4_kms.c
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@@ -13,6 +13,7 @@
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#include <linux/bitfield.h>
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#include <linux/bitops.h>
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+#include <linux/clk.h>
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#include <drm/drm_atomic.h>
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#include <drm/drm_atomic_helper.h>
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@@ -222,6 +223,7 @@ vc4_atomic_complete_commit(struct drm_at
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{
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struct drm_device *dev = state->dev;
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struct vc4_dev *vc4 = to_vc4_dev(dev);
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+ struct vc4_hvs *hvs = vc4->hvs;
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struct vc4_crtc *vc4_crtc;
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int i;
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@@ -237,6 +239,8 @@ vc4_atomic_complete_commit(struct drm_at
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vc4_hvs_mask_underrun(dev, vc4_crtc_state->assigned_channel);
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}
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+ clk_set_rate(hvs->core_clk, 500000000);
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+
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drm_atomic_helper_wait_for_fences(dev, state, false);
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drm_atomic_helper_wait_for_dependencies(state);
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@@ -262,6 +266,8 @@ vc4_atomic_complete_commit(struct drm_at
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drm_atomic_helper_commit_cleanup_done(state);
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+ clk_set_rate(hvs->core_clk, 200000000);
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+
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drm_atomic_state_put(state);
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up(&vc4->async_modeset);
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