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From 264b925a428d109529dca836dfb5160dd67f7f08 Mon Sep 17 00:00:00 2001
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
Date: Thu, 2 Dec 2021 14:11:09 +0000
Subject: [PATCH] dt: bcm283x: Change BCM283x HDMI to use firmware
 clock driver

The clk-bcm2835 handling of the pixel clock does not function
correctly when the HDMI power domain is disabled.

The firmware supports it correctly, and the firmware clock
driver now supports it, so switch the vc4-hdmi driver to use
the firmware clock driver.

Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
---
 arch/arm/boot/dts/bcm2835-common.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/arch/arm/boot/dts/bcm2835-common.dtsi
+++ b/arch/arm/boot/dts/bcm2835-common.dtsi
@@ -128,7 +128,7 @@
 				    "hd";
 			interrupts = <2 8>, <2 9>;
 			ddc = <&i2c2>;
-			clocks = <&clocks BCM2835_PLLH_PIX>,
+			clocks = <&firmware_clocks 9>,
 				 <&clocks BCM2835_CLOCK_HSM>;
 			clock-names = "pixel", "hdmi";
 			dmas = <&dma (17|(1<<27)|(1<<24))>;
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-26 10:24:58 +0000
er hardware.
+--- a/drivers/char/broadcom/Makefile
++++ b/drivers/char/broadcom/Makefile
+@@ -2,3 +2,4 @@ obj-$(CONFIG_BCM2708_VCMEM) += vc_mem.o
+ obj-$(CONFIG_BCM_VCIO) += vcio.o
+ obj-$(CONFIG_BCM2835_DEVGPIOMEM)+= bcm2835-gpiomem.o
+ obj-$(CONFIG_BCM2835_SMI_DEV) += bcm2835_smi_dev.o
++obj-$(CONFIG_RPIVID_MEM) += rpivid-mem.o
+--- /dev/null
++++ b/drivers/char/broadcom/rpivid-mem.c
+@@ -0,0 +1,292 @@
++// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
++/**
++ * rpivid-mem.c - character device access to the RPiVid decoder registers
++ *
++ * Based on bcm2835-gpiomem.c. Provides IO memory access to the decoder
++ * register blocks such that ffmpeg plugins can access the hardware.
++ *
++ * Jonathan Bell <jonathan@raspberrypi.org>
++ * Copyright (c) 2019, Raspberry Pi (Trading) Ltd.
++ *
++ * Redistribution and use in source and binary forms, with or without
++ * modification, are permitted provided that the following conditions
++ * are met:
++ * 1. Redistributions of source code must retain the above copyright
++ * notice, this list of conditions, and the following disclaimer,
++ * without modification.
++ * 2. Redistributions in binary form must reproduce the above copyright
++ * notice, this list of conditions and the following disclaimer in the
++ * documentation and/or other materials provided with the distribution.
++ * 3. The names of the above-listed copyright holders may not be used
++ * to endorse or promote products derived from this software without
++ * specific prior written permission.
++ *
++ * ALTERNATIVELY, this software may be distributed under the terms of the
++ * GNU General Public License ("GPL") version 2, as published by the Free
++ * Software Foundation.
++ *
++ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
++ * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
++ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
++ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
++ * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
++ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
++ * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
++ * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
++ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
++ * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
++ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
++ */
++
++#include <linux/kernel.h>
++#include <linux/module.h>
++#include <linux/of.h>
++#include <linux/of_device.h>
++#include <linux/platform_device.h>
++#include <linux/mm.h>
++#include <linux/slab.h>
++#include <linux/cdev.h>
++#include <linux/pagemap.h>
++#include <linux/io.h>
++
++#define DRIVER_NAME "rpivid-mem"
++#define DEVICE_MINOR 0
++
++struct rpivid_mem_priv {
++ dev_t devid;
++ struct class *class;
++ struct cdev rpivid_mem_cdev;
++ unsigned long regs_phys;
++ unsigned long mem_window_len;
++ struct device *dev;
++ const char *name;
++};
++
++static int rpivid_mem_open(struct inode *inode, struct file *file)
++{
++ int dev = iminor(inode);
++ int ret = 0;
++ struct rpivid_mem_priv *priv;
++
++ if (dev != DEVICE_MINOR && dev != DEVICE_MINOR + 1)
++ ret = -ENXIO;
++
++ priv = container_of(inode->i_cdev, struct rpivid_mem_priv,
++ rpivid_mem_cdev);
++ if (!priv)
++ return -EINVAL;
++ file->private_data = priv;
++ return ret;
++}
++
++static int rpivid_mem_release(struct inode *inode, struct file *file)
++{
++ int dev = iminor(inode);
++ int ret = 0;
++
++ if (dev != DEVICE_MINOR && dev != DEVICE_MINOR + 1)
++ ret = -ENXIO;
++
++ return ret;
++}
++
++static const struct vm_operations_struct rpivid_mem_vm_ops = {
++#ifdef CONFIG_HAVE_IOREMAP_PROT
++ .access = generic_access_phys
++#endif
++};
++
++static int rpivid_mem_mmap(struct file *file, struct vm_area_struct *vma)
++{
++ struct rpivid_mem_priv *priv;
++ unsigned long pages;
++
++ priv = file->private_data;
++ pages = priv->regs_phys >> PAGE_SHIFT;
++ /*
++ * The address decode is far larger than the actual number of registers.
++ * Just map the whole lot in.
++ */
++ vma->vm_page_prot = phys_mem_access_prot(file, pages,
++ priv->mem_window_len,
++ vma->vm_page_prot);
++ vma->vm_ops = &rpivid_mem_vm_ops;
++ if (remap_pfn_range(vma, vma->vm_start,
++ pages,
++ priv->mem_window_len,
++ vma->vm_page_prot)) {
++ return -EAGAIN;
++ }
++ return 0;
++}
++
++static const struct file_operations
++rpivid_mem_fops = {
++ .owner = THIS_MODULE,
++ .open = rpivid_mem_open,
++ .release = rpivid_mem_release,
++ .mmap = rpivid_mem_mmap,
++};
++
++static const struct of_device_id rpivid_mem_of_match[];
++static int rpivid_mem_probe(struct platform_device *pdev)
++{
++ int err;
++ const struct of_device_id *id;
++ struct device *dev = &pdev->dev;
++ struct resource *ioresource;
++ struct rpivid_mem_priv *priv;
++
++ /* Allocate buffers and instance data */
++
++ priv = kzalloc(sizeof(struct rpivid_mem_priv), GFP_KERNEL);
++
++ if (!priv) {
++ err = -ENOMEM;
++ goto failed_inst_alloc;
++ }
++ platform_set_drvdata(pdev, priv);
++
++ priv->dev = dev;
++ id = of_match_device(rpivid_mem_of_match, dev);
++ if (!id)
++ return -EINVAL;
++ priv->name = id->data;
++
++ ioresource = platform_get_resource(pdev, IORESOURCE_MEM, 0);
++ if (ioresource) {
++ priv->regs_phys = ioresource->start;
++ priv->mem_window_len = ioresource->end - ioresource->start;
++ } else {
++ dev_err(priv->dev, "failed to get IO resource");
++ err = -ENOENT;
++ goto failed_get_resource;
++ }
++
++ /* Create character device entries */
++
++ err = alloc_chrdev_region(&priv->devid,
++ DEVICE_MINOR, 2, priv->name);
++ if (err != 0) {
++ dev_err(priv->dev, "unable to allocate device number");
++ goto failed_alloc_chrdev;
++ }
++ cdev_init(&priv->rpivid_mem_cdev, &rpivid_mem_fops);
++ priv->rpivid_mem_cdev.owner = THIS_MODULE;
++ err = cdev_add(&priv->rpivid_mem_cdev, priv->devid, 2);
++ if (err != 0) {
++ dev_err(priv->dev, "unable to register device");
++ goto failed_cdev_add;
++ }
++
++ /* Create sysfs entries */
++
++ priv->class = class_create(THIS_MODULE, priv->name);
++ if (IS_ERR(priv->class)) {
++ err = PTR_ERR(priv->class);
++ goto failed_class_create;
++ }
++
++ dev = device_create(priv->class, NULL, priv->devid, NULL, priv->name);
++ if (IS_ERR(dev)) {
++ err = PTR_ERR(dev);
++ goto failed_device_create;
++ }
++
++ /* Legacy alias */
++ {
++ char *oldname = kstrdup(priv->name, GFP_KERNEL);
++
++ oldname[1] = 'a';
++ oldname[2] = 'r';
++ oldname[3] = 'g';
++ oldname[4] = 'o';
++ oldname[5] = 'n';
++ dev = device_create(priv->class, NULL, priv->devid + 1, NULL,
++ oldname + 1);
++ kfree(oldname);
++
++ if (IS_ERR(dev)) {
++ err = PTR_ERR(dev);
++ goto failed_legacy_device_create;
++ }
++ }
++
++ dev_info(priv->dev, "%s initialised: Registers at 0x%08lx length 0x%08lx",
++ priv->name, priv->regs_phys, priv->mem_window_len);
++
++ return 0;
++
++failed_legacy_device_create:
++ device_destroy(priv->class, priv->devid);
++failed_device_create:
++ class_destroy(priv->class);
++failed_class_create:
++ cdev_del(&priv->rpivid_mem_cdev);
++failed_cdev_add:
++ unregister_chrdev_region(priv->devid, 1);
++failed_alloc_chrdev:
++failed_get_resource:
++ kfree(priv);
++failed_inst_alloc:
++ dev_err(&pdev->dev, "could not load rpivid_mem");
++ return err;
++}
++
++static int rpivid_mem_remove(struct platform_device *pdev)
++{
++ struct device *dev = &pdev->dev;
++ struct rpivid_mem_priv *priv = platform_get_drvdata(pdev);
++
++ device_destroy(priv->class, priv->devid + 1);
++ device_destroy(priv->class, priv->devid);
++ class_destroy(priv->class);
++ cdev_del(&priv->rpivid_mem_cdev);
++ unregister_chrdev_region(priv->devid, 1);
++ kfree(priv);
++
++ dev_info(dev, "%s driver removed - OK", priv->name);
++ return 0;
++}
++
++static const struct of_device_id rpivid_mem_of_match[] = {
++ {
++ .compatible = "raspberrypi,rpivid-hevc-decoder",
++ .data = "rpivid-hevcmem",
++ },
++ {
++ .compatible = "raspberrypi,rpivid-h264-decoder",
++ .data = "rpivid-h264mem",
++ },
++ {
++ .compatible = "raspberrypi,rpivid-vp9-decoder",
++ .data = "rpivid-vp9mem",
++ },
++ /* The "intc" is included as this block of hardware contains the
++ * "frame done" status flags.
++ */
++ {
++ .compatible = "raspberrypi,rpivid-local-intc",
++ .data = "rpivid-intcmem",
++ },
++ { /* sentinel */ },
++};
++
++MODULE_DEVICE_TABLE(of, rpivid_mem_of_match);
++
++static struct platform_driver rpivid_mem_driver = {
++ .probe = rpivid_mem_probe,
++ .remove = rpivid_mem_remove,
++ .driver = {
++ .name = DRIVER_NAME,
++ .owner = THIS_MODULE,
++ .of_match_table = rpivid_mem_of_match,
++ },
++};
++
++module_platform_driver(rpivid_mem_driver);
++
++MODULE_ALIAS("platform:rpivid-mem");
++MODULE_LICENSE("GPL");
++MODULE_DESCRIPTION("Driver for accessing RPiVid decoder registers from userspace");
++MODULE_AUTHOR("Jonathan Bell <jonathan@raspberrypi.org>");
+--- a/drivers/mfd/bcm2835-pm.c
++++ b/drivers/mfd/bcm2835-pm.c
+@@ -50,14 +50,14 @@ static int bcm2835_pm_probe(struct platf
+ if (ret)
+ return ret;
+
+- /* Map the ARGON ASB regs if present. */
++ /* Map the RPiVid ASB regs if present. */
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 2);
+ if (res) {
+- pm->arg_asb = devm_ioremap_resource(dev, res);
+- if (IS_ERR(pm->arg_asb)) {
+- dev_err(dev, "Failed to map ARGON ASB: %ld\n",
+- PTR_ERR(pm->arg_asb));
+- return PTR_ERR(pm->arg_asb);
++ pm->rpivid_asb = devm_ioremap_resource(dev, res);
++ if (IS_ERR(pm->rpivid_asb)) {
++ dev_err(dev, "Failed to map RPiVid ASB: %ld\n",
++ PTR_ERR(pm->rpivid_asb));
++ return PTR_ERR(pm->rpivid_asb);
+ }
+ }
+
+--- a/drivers/soc/bcm/bcm2835-power.c
++++ b/drivers/soc/bcm/bcm2835-power.c
+@@ -637,15 +637,15 @@ static int bcm2835_power_probe(struct pl
+ power->base = pm->base;
+ power->asb = pm->asb;
+
+- /* 2711 hack: the new ARGON ASB took over V3D, which is our
++ /* 2711 hack: the new RPiVid ASB took over V3D, which is our
+ * only consumer of this driver so far. The old ASB seems to
+ * still be present with ISP and H264 bits but no V3D, but I
+ * don't know if that's real or not. The V3D is in the same
+ * place in the new ASB as the old one, so just poke the new
+ * one for now.
+ */
+- if (pm->arg_asb) {
+- power->asb = pm->arg_asb;
++ if (pm->rpivid_asb) {
++ power->asb = pm->rpivid_asb;
+ power->is_2711 = true;
+ }
+
+--- a/include/linux/mfd/bcm2835-pm.h
++++ b/include/linux/mfd/bcm2835-pm.h
+@@ -9,7 +9,7 @@ struct bcm2835_pm {
+ struct device *dev;
+ void __iomem *base;
+ void __iomem *asb;
+- void __iomem *arg_asb;
++ void __iomem *rpivid_asb;
+ };
+
+ #endif /* BCM2835_MFD_PM_H */
generated by cgit v1.2.3 (git 2.25.1) at 2025-02-26 10:24:57 +0000