2b1c6b21b5
As usual these patches were extracted and rebased from the raspberry pi repo: https://github.com/raspberrypi/linux/tree/rpi-4.4.y Also adds support for Raspberry Pi Compute Module 3 (untested). Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
85 lines
2.4 KiB
Diff
85 lines
2.4 KiB
Diff
From 7e7500431515d41e1498cef0984ef6f9b91cac67 Mon Sep 17 00:00:00 2001
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From: Matthias Reichl <hias@horus.com>
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Date: Mon, 16 Nov 2015 14:05:35 +0000
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Subject: [PATCH] bcm2835-dma: Fix up convert to DMA pool
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---
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drivers/dma/bcm2835-dma.c | 36 ++++++++++++++++++++++++++----------
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1 file changed, 26 insertions(+), 10 deletions(-)
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--- a/drivers/dma/bcm2835-dma.c
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+++ b/drivers/dma/bcm2835-dma.c
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@@ -488,6 +488,17 @@ static struct dma_async_tx_descriptor *b
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c->cyclic = true;
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return vchan_tx_prep(&c->vc, &d->vd, flags);
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+error_cb:
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+ i--;
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+ for (; i >= 0; i--) {
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+ struct bcm2835_cb_entry *cb_entry = &d->cb_list[i];
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+
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+ dma_pool_free(c->cb_pool, cb_entry->cb, cb_entry->paddr);
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+ }
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+
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+ kfree(d->cb_list);
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+ kfree(d);
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+ return NULL;
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}
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static struct dma_async_tx_descriptor *
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@@ -534,6 +545,7 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
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if (!d)
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return NULL;
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+ d->c = c;
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d->dir = direction;
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if (c->ch >= 8) /* LITE channel */
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@@ -553,15 +565,21 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
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d->frames += len / max_size + 1;
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}
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- /* Allocate memory for control blocks */
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- d->control_block_size = d->frames * sizeof(struct bcm2835_dma_cb);
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- d->control_block_base = dma_zalloc_coherent(chan->device->dev,
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- d->control_block_size, &d->control_block_base_phys,
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- GFP_NOWAIT);
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- if (!d->control_block_base) {
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+ d->cb_list = kcalloc(d->frames, sizeof(*d->cb_list), GFP_KERNEL);
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+ if (!d->cb_list) {
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kfree(d);
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return NULL;
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}
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+ /* Allocate memory for control blocks */
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+ for (i = 0; i < d->frames; i++) {
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+ struct bcm2835_cb_entry *cb_entry = &d->cb_list[i];
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+
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+ cb_entry->cb = dma_pool_zalloc(c->cb_pool, GFP_ATOMIC,
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+ &cb_entry->paddr);
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+
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+ if (!cb_entry->cb)
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+ goto error_cb;
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+ }
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/*
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* Iterate over all SG entries, create a control block
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@@ -578,7 +596,7 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
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for (j = 0; j < len; j += max_size) {
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struct bcm2835_dma_cb *control_block =
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- &d->control_block_base[i + split_cnt];
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+ d->cb_list[i + split_cnt].cb;
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/* Setup addresses */
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if (d->dir == DMA_DEV_TO_MEM) {
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@@ -620,9 +638,7 @@ bcm2835_dma_prep_slave_sg(struct dma_cha
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if (i < sg_len - 1 || len - j > max_size) {
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/* Next block is the next frame. */
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control_block->next =
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- d->control_block_base_phys +
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- sizeof(struct bcm2835_dma_cb) *
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- (i + split_cnt + 1);
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+ d->cb_list[i + split_cnt + 1].paddr;
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} else {
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/* Next block is empty. */
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control_block->next = 0;
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