From cdcd7f7287532131d2075dd45f15aaf39dcfe983 Mon Sep 17 00:00:00 2001
From: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Date: Fri, 14 Nov 2014 15:40:45 +0000
Subject: [PATCH] ASoC: wm_adsp: Use vmalloc to allocate firmware download
 buffer

Use vmalloc to allocate the buffer for firmware/coefficient download and
rely on the SPI core to split this up into DMA-able chunks. This should
give better performance and means we no longer need to manually split
the download into page size chunks to avoid allocating overly large
continuous memory regions.

Signed-off-by: Charles Keepax <ckeepax@opensource.wolfsonmicro.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---
 sound/soc/codecs/wm_adsp.c | 56 +++++++++++++++-----------------------
 1 file changed, 22 insertions(+), 34 deletions(-)

diff --git a/sound/soc/codecs/wm_adsp.c b/sound/soc/codecs/wm_adsp.c
index f412a9911a75..0a08ef5e27c8 100644
--- a/sound/soc/codecs/wm_adsp.c
+++ b/sound/soc/codecs/wm_adsp.c
@@ -21,6 +21,7 @@
 #include <linux/regmap.h>
 #include <linux/regulator/consumer.h>
 #include <linux/slab.h>
+#include <linux/vmalloc.h>
 #include <linux/workqueue.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
@@ -169,11 +170,12 @@ static struct wm_adsp_buf *wm_adsp_buf_alloc(const void *src, size_t len,
 	if (buf == NULL)
 		return NULL;
 
-	buf->buf = kmemdup(src, len, GFP_KERNEL | GFP_DMA);
+	buf->buf = vmalloc(len);
 	if (!buf->buf) {
-		kfree(buf);
+		vfree(buf);
 		return NULL;
 	}
+	memcpy(buf->buf, src, len);
 
 	if (list)
 		list_add_tail(&buf->list, list);
@@ -188,7 +190,7 @@ static void wm_adsp_buf_free(struct list_head *list)
 							   struct wm_adsp_buf,
 							   list);
 		list_del(&buf->list);
-		kfree(buf->buf);
+		vfree(buf->buf);
 		kfree(buf);
 	}
 }
@@ -684,38 +686,24 @@ static int wm_adsp_load(struct wm_adsp *dsp)
 		}
 
 		if (reg) {
-			size_t to_write = PAGE_SIZE;
-			size_t remain = le32_to_cpu(region->len);
-			const u8 *data = region->data;
-
-			while (remain > 0) {
-				if (remain < PAGE_SIZE)
-					to_write = remain;
-
-				buf = wm_adsp_buf_alloc(data,
-							to_write,
-							&buf_list);
-				if (!buf) {
-					adsp_err(dsp, "Out of memory\n");
-					ret = -ENOMEM;
-					goto out_fw;
-				}
-
-				ret = regmap_raw_write_async(regmap, reg,
-							     buf->buf,
-							     to_write);
-				if (ret != 0) {
-					adsp_err(dsp,
-						"%s.%d: Failed to write %zd bytes at %d in %s: %d\n",
-						file, regions,
-						to_write, offset,
-						region_name, ret);
-					goto out_fw;
-				}
+			buf = wm_adsp_buf_alloc(region->data,
+						le32_to_cpu(region->len),
+						&buf_list);
+			if (!buf) {
+				adsp_err(dsp, "Out of memory\n");
+				ret = -ENOMEM;
+				goto out_fw;
+			}
 
-				data += to_write;
-				reg += to_write / 2;
-				remain -= to_write;
+			ret = regmap_raw_write_async(regmap, reg, buf->buf,
+						     le32_to_cpu(region->len));
+			if (ret != 0) {
+				adsp_err(dsp,
+					"%s.%d: Failed to write %d bytes at %d in %s: %d\n",
+					file, regions,
+					le32_to_cpu(region->len), offset,
+					region_name, ret);
+				goto out_fw;
 			}
 		}
 
-- 
2.20.1