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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>
87 lines
2.5 KiB
Diff
87 lines
2.5 KiB
Diff
From a236ecec838c8cf9928e9d2b8dc03346276627a1 Mon Sep 17 00:00:00 2001
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From: Martin Sperl <kernel@martin.sperl.org>
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Date: Fri, 22 Apr 2016 17:17:13 +0000
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Subject: [PATCH] Revert "bcm2835-dma: Fix up convert to DMA pool"
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This reverts commit ec2e48fda22c57cab56a4332d1a095f91c919493.
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---
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drivers/dma/bcm2835-dma.c | 36 ++++++++++--------------------------
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1 file changed, 10 insertions(+), 26 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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@@ -488,17 +488,6 @@ 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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@@ -545,7 +534,6 @@ 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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@@ -565,21 +553,15 @@ 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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- d->cb_list = kcalloc(d->frames, sizeof(*d->cb_list), GFP_KERNEL);
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- if (!d->cb_list) {
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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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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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@@ -596,7 +578,7 @@ 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->cb_list[i + split_cnt].cb;
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+ &d->control_block_base[i + split_cnt];
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/* Setup addresses */
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if (d->dir == DMA_DEV_TO_MEM) {
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@@ -638,7 +620,9 @@ 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->cb_list[i + split_cnt + 1].paddr;
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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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} else {
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/* Next block is empty. */
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control_block->next = 0;
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