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Content-Disposition: inline; filename="950-0532-ARM-dts-bcm2835_audio-missing-firmware-reference.patch"
Last-Modified: Sat, 27 Jul 2024 05:23:08 GMT
Expires: Tue, 25 Jul 2034 05:23:08 GMT
ETag: "a3df2d9caa6696b6f86d36638d8d8826029f58cb"

From ad987063207b77763e541f57535ea6b681e4ef3b Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Mon, 18 Oct 2021 11:12:42 +0100
Subject: [PATCH] ARM: dts: bcm2835_audio missing firmware reference

The firmware driver has been changed to count its clients. An earlier
commit removed the downstream patch permitting the hacky technique of
passing NULL to rpi_firmware_get to pick up the last instace, but
failed to add the necessary "firmware" property to the bcm2835_audio
node. Correct that omission.

See: https://github.com/raspberrypi/linux/issues/4634
     https://github.com/raspberrypi/linux/issues/4635

Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
 arch/arm/boot/dts/bcm270x-rpi.dtsi | 1 +
 1 file changed, 1 insertion(+)

--- a/arch/arm/boot/dts/bcm270x-rpi.dtsi
+++ b/arch/arm/boot/dts/bcm270x-rpi.dtsi
@@ -148,6 +148,7 @@
 	/* Onboard audio */
 	audio: bcm2835_audio {
 		compatible = "brcm,bcm2835-audio";
+		brcm,firmware = <&firmware>;
 		brcm,pwm-channels = <8>;
 		status = "disabled";
 	};
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From: detule &lt;ogjoneski@gmail.com&gt;
Date: Tue, 2 Oct 2018 04:10:08 -0400
Subject: [PATCH] staging: vchiq_arm: Usa a DMA pool for small bulks

During a bulk transfer we request a DMA allocation to hold the
scatter-gather list.  Most of the time, this allocation is small
(&lt;&lt; PAGE_SIZE), however it can be requested at a high enough frequency
to cause fragmentation and/or stress the CMA allocator (think time
spent in compaction here, or during allocations elsewhere).

Implement a pool to serve up small DMA allocations, falling back
to a coherent allocation if the request is greater than
VCHIQ_DMA_POOL_SIZE.

Signed-off-by: Oliver Gjoneski &lt;ogjoneski@gmail.com&gt;
<span class="gd">---</span>
 .../interface/vchiq_arm/vchiq_arm.c           | 36 ++++++++++++++++---
 1 file changed, 32 insertions(+), 4 deletions(-)

<span class="gd">--- a/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c</span>
<span class="gi">+++ b/drivers/staging/vc04_services/interface/vchiq_arm/vchiq_arm.c</span>
<span class="gu">@@ -22,6 +22,7 @@</span>
 #include &lt;linux/platform_device.h&gt;
 #include &lt;linux/compat.h&gt;
 #include &lt;linux/dma-mapping.h&gt;
<span class="gi">+#include &lt;linux/dmapool.h&gt;</span>
 #include &lt;linux/rcupdate.h&gt;
 #include &lt;linux/delay.h&gt;
 #include &lt;linux/slab.h&gt;
<span class="gu">@@ -51,6 +52,8 @@</span>
 
 #define ARM_DS_ACTIVE	BIT(2)
 
<span class="gi">+#define VCHIQ_DMA_POOL_SIZE PAGE_SIZE</span>
<span class="gi">+</span>
 /* Override the default prefix, which would be vchiq_arm (from the filename) */
 #undef MODULE_PARAM_PREFIX
 #define MODULE_PARAM_PREFIX DEVICE_NAME &quot;.&quot;
<span class="gu">@@ -93,6 +96,7 @@ struct vchiq_pagelist_info {</span>
 	struct pagelist *pagelist;
 	size_t pagelist_buffer_size;
 	dma_addr_t dma_addr;
<span class="gi">+	bool is_from_pool;</span>
 	enum dma_data_direction dma_dir;
 	unsigned int num_pages;
 	unsigned int pages_need_release;
<span class="gu">@@ -113,6 +117,7 @@ static void __iomem *g_regs;</span>
  * of 32.
  */
 static unsigned int g_cache_line_size = 32;
<span class="gi">+static struct dma_pool *g_dma_pool;</span>
 static unsigned int g_use_36bit_addrs = 0;
 static unsigned int g_fragments_size;
 static char *g_fragments_base;
<span class="gu">@@ -156,8 +161,14 @@ cleanup_pagelistinfo(struct vchiq_pageli</span>
 	if (pagelistinfo-&gt;pages_need_release)
 		unpin_user_pages(pagelistinfo-&gt;pages, pagelistinfo-&gt;num_pages);
 
<span class="gd">-	dma_free_coherent(g_dev, pagelistinfo-&gt;pagelist_buffer_size,</span>
<span class="gd">-			  pagelistinfo-&gt;pagelist, pagelistinfo-&gt;dma_addr);</span>
<span class="gi">+	if (pagelistinfo-&gt;is_from_pool) {</span>
<span class="gi">+		dma_pool_free(g_dma_pool, pagelistinfo-&gt;pagelist,</span>
<span class="gi">+			      pagelistinfo-&gt;dma_addr);</span>
<span class="gi">+	} else {</span>
<span class="gi">+		dma_free_coherent(g_dev, pagelistinfo-&gt;pagelist_buffer_size,</span>
<span class="gi">+				  pagelistinfo-&gt;pagelist,</span>
<span class="gi">+				  pagelistinfo-&gt;dma_addr);</span>
<span class="gi">+	}</span>
 }
 
 /* There is a potential problem with partial cache lines (pages?)
<span class="gu">@@ -178,6 +189,7 @@ create_pagelist(char *buf, char __user *</span>
 	u32 *addrs;
 	unsigned int num_pages, offset, i, k;
 	int actual_pages;
<span class="gi">+	bool is_from_pool;</span>
 	size_t pagelist_size;
 	struct scatterlist *scatterlist, *sg;
 	int dma_buffers;
<span class="gu">@@ -207,8 +219,16 @@ create_pagelist(char *buf, char __user *</span>
 	/* Allocate enough storage to hold the page pointers and the page
 	 * list
 	 */
<span class="gd">-	pagelist = dma_alloc_coherent(g_dev, pagelist_size, &amp;dma_addr,</span>
<span class="gd">-				      GFP_KERNEL);</span>
<span class="gi">+	if (pagelist_size &gt; VCHIQ_DMA_POOL_SIZE) {</span>
<span class="gi">+		pagelist = dma_alloc_coherent(g_dev,</span>
<span class="gi">+					       pagelist_size,</span>
<span class="gi">+					       &amp;dma_addr,</span>
<span class="gi">+					       GFP_KERNEL);</span>
<span class="gi">+		is_from_pool = false;</span>
<span class="gi">+	} else {</span>
<span class="gi">+		pagelist = dma_pool_alloc(g_dma_pool, GFP_KERNEL, &amp;dma_addr);</span>
<span class="gi">+		is_from_pool = true;</span>
<span class="gi">+	}</span>
 
 	vchiq_log_trace(vchiq_arm_log_level, &quot;%s - %pK&quot;, __func__, pagelist);
 
<span class="gu">@@ -229,6 +249,7 @@ create_pagelist(char *buf, char __user *</span>
 	pagelistinfo-&gt;pagelist = pagelist;
 	pagelistinfo-&gt;pagelist_buffer_size = pagelist_size;
 	pagelistinfo-&gt;dma_addr = dma_addr;
<span class="gi">+	pagelistinfo-&gt;is_from_pool = is_from_pool;</span>
 	pagelistinfo-&gt;dma_dir =  (type == PAGELIST_WRITE) ?
 				  DMA_TO_DEVICE : DMA_FROM_DEVICE;
 	pagelistinfo-&gt;num_pages = num_pages;
<span class="gu">@@ -569,6 +590,13 @@ int vchiq_platform_init(struct platform_</span>
 
 	g_dev = dev;
 	g_dma_dev = dma_dev ?: dev;
<span class="gi">+	g_dma_pool = dmam_pool_create(&quot;vchiq_scatter_pool&quot;, dev,</span>
<span class="gi">+				      VCHIQ_DMA_POOL_SIZE, g_cache_line_size,</span>
<span class="gi">+				      0);</span>
<span class="gi">+	if (!g_dma_pool) {</span>
<span class="gi">+		dev_err(dev, &quot;failed to create dma pool&quot;);</span>
<span class="gi">+		return -ENOMEM;</span>
<span class="gi">+	}</span>
 
 	vchiq_log_info(vchiq_arm_log_level,
 		&quot;vchiq_init - done (slots %pK, phys %pad)&quot;,
</pre></div>
</code></pre></td></tr></table>
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