[PATCH 5.12 07/11] mt76: dma: introduce mt76_dma_queue_reset routine

Greg Kroah-Hartman
2021-07-09T13:23:08Z

From: Lorenzo Bianconi <lorenzo@kernel.org>

commit 3990465db6829c91e8ebfde51ba2d98885020249 upstream.

Introduce mt76_dma_queue_reset utility routine to reset a given hw
queue. This is a preliminary patch to introduce mt7921 chip reset
support.

Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Lorenzo Bianconi <lorenzo@kernel.org>
Signed-off-by: Felix Fietkau <nbd@nbd.name>
Cc: Deren Wu <Deren.Wu@mediatek.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/net/wireless/mediatek/mt76/dma.c | 46 ++++++++++++++++++------------
drivers/net/wireless/mediatek/mt76/mt76.h | 3 +
2 files changed, 31 insertions(+), 18 deletions(-)

--- a/drivers/net/wireless/mediatek/mt76/dma.c
+++ b/drivers/net/wireless/mediatek/mt76/dma.c
@@ -79,13 +79,38 @@ mt76_free_pending_txwi(struct mt76_dev *
local_bh_enable();
}

+static void
+mt76_dma_sync_idx(struct mt76_dev *dev, struct mt76_queue *q)
+{
+ writel(q->desc_dma, &q->regs->desc_base);
+ writel(q->ndesc, &q->regs->ring_size);
+ q->head = readl(&q->regs->dma_idx);
+ q->tail = q->head;
+}
+
+static void
+mt76_dma_queue_reset(struct mt76_dev *dev, struct mt76_queue *q)
+{
+ int i;
+
+ if (!q)
+ return;
+
+ /* clear descriptors */
+ for (i = 0; i < q->ndesc; i++)
+ q->desc[i].ctrl = cpu_to_le32(MT_DMA_CTL_DMA_DONE);
+
+ writel(0, &q->regs->cpu_idx);
+ writel(0, &q->regs->dma_idx);
+ mt76_dma_sync_idx(dev, q);
+}
+
static int
mt76_dma_alloc_queue(struct mt76_dev *dev, struct mt76_queue *q,
int idx, int n_desc, int bufsize,
u32 ring_base)
{
int size;
- int i;

spin_lock_init(&q->lock);
spin_lock_init(&q->cleanup_lock);
@@ -105,14 +130,7 @@ mt76_dma_alloc_queue(struct mt76_dev *de
if (!q->entry)
return -ENOMEM;

- /* clear descriptors */
- for (i = 0; i < q->ndesc; i++)
- q->desc[i].ctrl = cpu_to_le32(MT_DMA_CTL_DMA_DONE);
-
- writel(q->desc_dma, &q->regs->desc_base);
- writel(0, &q->regs->cpu_idx);
- writel(0, &q->regs->dma_idx);
- writel(q->ndesc, &q->regs->ring_size);
+ mt76_dma_queue_reset(dev, q);

return 0;
}
@@ -202,15 +220,6 @@ mt76_dma_tx_cleanup_idx(struct mt76_dev
}

static void
-mt76_dma_sync_idx(struct mt76_dev *dev, struct mt76_queue *q)
-{
- writel(q->desc_dma, &q->regs->desc_base);
- writel(q->ndesc, &q->regs->ring_size);
- q->head = readl(&q->regs->dma_idx);
- q->tail = q->head;
-}
-
-static void
mt76_dma_kick_queue(struct mt76_dev *dev, struct mt76_queue *q)
{
wmb();
@@ -640,6 +649,7 @@ mt76_dma_init(struct mt76_dev *dev)
static const struct mt76_queue_ops mt76_dma_ops = {
.init = mt76_dma_init,
.alloc = mt76_dma_alloc_queue,
+ .reset_q = mt76_dma_queue_reset,
.tx_queue_skb_raw = mt76_dma_tx_queue_skb_raw,
.tx_queue_skb = mt76_dma_tx_queue_skb,
.tx_cleanup = mt76_dma_tx_cleanup,
--- a/drivers/net/wireless/mediatek/mt76/mt76.h
+++ b/drivers/net/wireless/mediatek/mt76/mt76.h
@@ -191,6 +191,8 @@ struct mt76_queue_ops {
bool flush);

void (*kick)(struct mt76_dev *dev, struct mt76_queue *q);
+
+ void (*reset_q)(struct mt76_dev *dev, struct mt76_queue *q);
};

enum mt76_wcid_flags {
@@ -786,6 +788,7 @@ static inline u16 mt76_rev(struct mt76_d
#define mt76_queue_rx_reset(dev, ...) (dev)->mt76.queue_ops->rx_reset(&((dev)->mt76), __VA_ARGS__)
#define mt76_queue_tx_cleanup(dev, ...) (dev)->mt76.queue_ops->tx_cleanup(&((dev)->mt76), __VA_ARGS__)
#define mt76_queue_kick(dev, ...) (dev)->mt76.queue_ops->kick(&((dev)->mt76), __VA_ARGS__)
+#define mt76_queue_reset(dev, ...) (dev)->mt76.queue_ops->reset_q(&((dev)->mt76), __VA_ARGS__)

#define mt76_for_each_q_rx(dev, i) \
for (i = 0; i < ARRAY_SIZE((dev)->q_rx) && \