aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.4/0089-bcm2835-dma-Fix-up-convert-to-DMA-pool.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0089-bcm2835-dma-Fix-up-convert-to-DMA-pool.patch')
-rw-r--r--target/linux/brcm2708/patches-4.4/0089-bcm2835-dma-Fix-up-convert-to-DMA-pool.patch85
1 files changed, 85 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0089-bcm2835-dma-Fix-up-convert-to-DMA-pool.patch b/target/linux/brcm2708/patches-4.4/0089-bcm2835-dma-Fix-up-convert-to-DMA-pool.patch
new file mode 100644
index 0000000000..031f4c6ad5
--- /dev/null
+++ b/target/linux/brcm2708/patches-4.4/0089-bcm2835-dma-Fix-up-convert-to-DMA-pool.patch
@@ -0,0 +1,85 @@
+From 83a58ceb78952a15b2a14716e2099cb548cd9081 Mon Sep 17 00:00:00 2001
+From: Matthias Reichl <hias@horus.com>
+Date: Mon, 16 Nov 2015 14:05:35 +0000
+Subject: [PATCH 089/127] bcm2835-dma: Fix up convert to DMA pool
+
+---
+ drivers/dma/bcm2835-dma.c | 36 ++++++++++++++++++++++++++----------
+ 1 file changed, 26 insertions(+), 10 deletions(-)
+
+--- a/drivers/dma/bcm2835-dma.c
++++ b/drivers/dma/bcm2835-dma.c
+@@ -488,6 +488,17 @@ static struct dma_async_tx_descriptor *b
+ c->cyclic = true;
+
+ return vchan_tx_prep(&c->vc, &d->vd, flags);
++error_cb:
++ i--;
++ for (; i >= 0; i--) {
++ struct bcm2835_cb_entry *cb_entry = &d->cb_list[i];
++
++ dma_pool_free(c->cb_pool, cb_entry->cb, cb_entry->paddr);
++ }
++
++ kfree(d->cb_list);
++ kfree(d);
++ return NULL;
+ }
+
+ static struct dma_async_tx_descriptor *
+@@ -534,6 +545,7 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
+ if (!d)
+ return NULL;
+
++ d->c = c;
+ d->dir = direction;
+
+ if (c->ch >= 8) /* LITE channel */
+@@ -553,15 +565,21 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
+ d->frames += len / max_size + 1;
+ }
+
+- /* Allocate memory for control blocks */
+- d->control_block_size = d->frames * sizeof(struct bcm2835_dma_cb);
+- d->control_block_base = dma_zalloc_coherent(chan->device->dev,
+- d->control_block_size, &d->control_block_base_phys,
+- GFP_NOWAIT);
+- if (!d->control_block_base) {
++ d->cb_list = kcalloc(d->frames, sizeof(*d->cb_list), GFP_KERNEL);
++ if (!d->cb_list) {
+ kfree(d);
+ return NULL;
+ }
++ /* Allocate memory for control blocks */
++ for (i = 0; i < d->frames; i++) {
++ struct bcm2835_cb_entry *cb_entry = &d->cb_list[i];
++
++ cb_entry->cb = dma_pool_zalloc(c->cb_pool, GFP_ATOMIC,
++ &cb_entry->paddr);
++
++ if (!cb_entry->cb)
++ goto error_cb;
++ }
+
+ /*
+ * Iterate over all SG entries, create a control block
+@@ -578,7 +596,7 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
+
+ for (j = 0; j < len; j += max_size) {
+ struct bcm2835_dma_cb *control_block =
+- &d->control_block_base[i + split_cnt];
++ d->cb_list[i + split_cnt].cb;
+
+ /* Setup addresses */
+ if (d->dir == DMA_DEV_TO_MEM) {
+@@ -620,9 +638,7 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
+ if (i < sg_len - 1 || len - j > max_size) {
+ /* Next block is the next frame. */
+ control_block->next =
+- d->control_block_base_phys +
+- sizeof(struct bcm2835_dma_cb) *
+- (i + split_cnt + 1);
++ d->cb_list[i + split_cnt + 1].paddr;
+ } else {
+ /* Next block is empty. */
+ control_block->next = 0;