openwrt/target/linux/bcm27xx/patches-6.6/950-1127-drm-vc4-Use-phys-addresses-for-slave-DMA-config.patch

From 3d4f30269402f795f6a4054ced3bfdcbdaddc357 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Thu, 11 May 2023 16:08:15 +0100
Subject: [PATCH 1127/1135] drm/vc4: Use phys addresses for slave DMA config

Slave addresses for DMA are meant to be supplied as physical addresses
(contrary to what struct snd_dmaengine_dai_dma_data does).

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
 drivers/gpu/drm/vc4/vc4_hdmi.c | 14 +++++---------
 1 file changed, 5 insertions(+), 9 deletions(-)

--- a/drivers/gpu/drm/vc4/vc4_hdmi.c
+++ b/drivers/gpu/drm/vc4/vc4_hdmi.c
@@ -2831,7 +2831,7 @@ static int vc4_hdmi_audio_init(struct vc
 	struct snd_soc_card *card = &vc4_hdmi->audio.card;
 	struct device *dev = &vc4_hdmi->pdev->dev;
 	struct platform_device *codec_pdev;
-	const __be32 *addr;
+	struct resource *iomem;
 	int index, len;
 	int ret;
 
@@ -2867,22 +2867,18 @@ static int vc4_hdmi_audio_init(struct vc
 	}
 
 	/*
-	 * Get the physical address of VC4_HD_MAI_DATA. We need to retrieve
-	 * the bus address specified in the DT, because the physical address
-	 * (the one returned by platform_get_resource()) is not appropriate
-	 * for DMA transfers.
-	 * This VC/MMU should probably be exposed to avoid this kind of hacks.
+	 * Get the physical address of VC4_HD_MAI_DATA.
 	 */
 	index = of_property_match_string(dev->of_node, "reg-names", "hd");
 	/* Before BCM2711, we don't have a named register range */
 	if (index < 0)
 		index = 1;
 
-	addr = of_get_address(dev->of_node, index, NULL, NULL);
-	if (!addr)
+	iomem = platform_get_resource(vc4_hdmi->pdev, IORESOURCE_MEM, index);
+	if (!iomem)
 		return -EINVAL;
 
-	vc4_hdmi->audio.dma_data.addr = be32_to_cpup(addr) + mai_data->offset;
+	vc4_hdmi->audio.dma_data.addr = iomem->start + mai_data->offset;
 	vc4_hdmi->audio.dma_data.addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
 	vc4_hdmi->audio.dma_data.maxburst = 2;