You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
86 lines
2.5 KiB
86 lines
2.5 KiB
From d9c36fdc44cdf154a0849b03e94b0a6b6f86defb Mon Sep 17 00:00:00 2001
|
|
From: Martin Sperl <kernel@martin.sperl.org>
|
|
Date: Fri, 22 Apr 2016 17:17:13 +0000
|
|
Subject: [PATCH 390/423] Revert "bcm2835-dma: Fix up convert to DMA pool"
|
|
|
|
This reverts commit ec2e48fda22c57cab56a4332d1a095f91c919493.
|
|
---
|
|
drivers/dma/bcm2835-dma.c | 36 ++++++++++--------------------------
|
|
1 file changed, 10 insertions(+), 26 deletions(-)
|
|
|
|
--- a/drivers/dma/bcm2835-dma.c
|
|
+++ b/drivers/dma/bcm2835-dma.c
|
|
@@ -488,17 +488,6 @@ 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 *
|
|
@@ -545,7 +534,6 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
|
|
if (!d)
|
|
return NULL;
|
|
|
|
- d->c = c;
|
|
d->dir = direction;
|
|
|
|
if (c->ch >= 8) /* LITE channel */
|
|
@@ -565,21 +553,15 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
|
|
d->frames += len / max_size + 1;
|
|
}
|
|
|
|
- d->cb_list = kcalloc(d->frames, sizeof(*d->cb_list), GFP_KERNEL);
|
|
- if (!d->cb_list) {
|
|
+ /* 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) {
|
|
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
|
|
@@ -596,7 +578,7 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
|
|
|
|
for (j = 0; j < len; j += max_size) {
|
|
struct bcm2835_dma_cb *control_block =
|
|
- d->cb_list[i + split_cnt].cb;
|
|
+ &d->control_block_base[i + split_cnt];
|
|
|
|
/* Setup addresses */
|
|
if (d->dir == DMA_DEV_TO_MEM) {
|
|
@@ -638,7 +620,9 @@ 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->cb_list[i + split_cnt + 1].paddr;
|
|
+ d->control_block_base_phys +
|
|
+ sizeof(struct bcm2835_dma_cb) *
|
|
+ (i + split_cnt + 1);
|
|
} else {
|
|
/* Next block is empty. */
|
|
control_block->next = 0;
|
|
|