diff options
Diffstat (limited to 'package/kernel/mac80211/patches/600-0034-rt2x00-rt2800mmio-add-a-workaround-for-spurious-TX_F.patch')
| -rw-r--r-- | package/kernel/mac80211/patches/600-0034-rt2x00-rt2800mmio-add-a-workaround-for-spurious-TX_F.patch | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/600-0034-rt2x00-rt2800mmio-add-a-workaround-for-spurious-TX_F.patch b/package/kernel/mac80211/patches/600-0034-rt2x00-rt2800mmio-add-a-workaround-for-spurious-TX_F.patch new file mode 100644 index 0000000..71f7bba --- /dev/null +++ b/package/kernel/mac80211/patches/600-0034-rt2x00-rt2800mmio-add-a-workaround-for-spurious-TX_F.patch @@ -0,0 +1,136 @@ +From 5e67d4f8a46d19748b501c2ef86de3f50d3cfd51 Mon Sep 17 00:00:00 2001 +From: Gabor Juhos <juhosg@openwrt.org> +Date: Sun, 24 Mar 2013 19:26:27 +0100 +Subject: [PATCH] rt2x00: rt2800mmio: add a workaround for spurious + TX_FIFO_STATUS interrupts + +Signed-off-by: Gabor Juhos <juhosg@openwrt.org> +--- + drivers/net/wireless/rt2x00/rt2800mmio.c | 72 +++++++++++++++++++++++++----- + drivers/net/wireless/rt2x00/rt2x00.h | 5 +++ + 2 files changed, 65 insertions(+), 12 deletions(-) + +--- a/drivers/net/wireless/rt2x00/rt2800mmio.c ++++ b/drivers/net/wireless/rt2x00/rt2800mmio.c +@@ -415,9 +415,9 @@ void rt2800mmio_autowake_tasklet(unsigne + } + EXPORT_SYMBOL_GPL(rt2800mmio_autowake_tasklet); + +-static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev) ++static void rt2800mmio_txstatus_interrupt(struct rt2x00_dev *rt2x00dev, ++ u32 status) + { +- u32 status; + int i; + + /* +@@ -438,29 +438,77 @@ static void rt2800mmio_txstatus_interrup + * Since we have only one producer and one consumer we don't + * need to lock the kfifo. + */ +- for (i = 0; i < rt2x00dev->tx->limit; i++) { +- rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO, &status); +- +- if (!rt2x00_get_field32(status, TX_STA_FIFO_VALID)) +- break; +- ++ i = 0; ++ do { + if (!kfifo_put(&rt2x00dev->txstatus_fifo, status)) { +- rt2x00_warn(rt2x00dev, "TX status FIFO overrun, drop tx status report\n"); ++ rt2x00_warn(rt2x00dev, ++ "TX status FIFO overrun, drop TX status report\n"); + break; + } +- } ++ ++ if (++i >= rt2x00dev->tx->limit) ++ break; ++ ++ rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO, &status); ++ } while (rt2x00_get_field32(status, TX_STA_FIFO_VALID)); + + /* Schedule the tasklet for processing the tx status. */ + tasklet_schedule(&rt2x00dev->txstatus_tasklet); + } + ++#define RT2800MMIO_TXSTATUS_IRQ_MAX_RETRIES 4 ++ ++static bool rt2800mmio_txstatus_is_spurious(struct rt2x00_dev *rt2x00dev, ++ u32 txstatus) ++{ ++ if (likely(rt2x00_get_field32(txstatus, TX_STA_FIFO_VALID))) { ++ rt2x00dev->txstatus_irq_retries = 0; ++ return false; ++ } ++ ++ rt2x00dev->txstatus_irq_retries++; ++ ++ /* Ensure that we don't go into an infinite IRQ loop. */ ++ if (rt2x00dev->txstatus_irq_retries >= ++ RT2800MMIO_TXSTATUS_IRQ_MAX_RETRIES) { ++ rt2x00_warn(rt2x00dev, ++ "%u spurious TX_FIFO_STATUS interrupt(s)\n", ++ rt2x00dev->txstatus_irq_retries); ++ rt2x00dev->txstatus_irq_retries = 0; ++ return false; ++ } ++ ++ return true; ++} ++ + irqreturn_t rt2800mmio_interrupt(int irq, void *dev_instance) + { + struct rt2x00_dev *rt2x00dev = dev_instance; + u32 reg, mask; ++ u32 txstatus = 0; + +- /* Read status and ACK all interrupts */ ++ /* Read status */ + rt2x00mmio_register_read(rt2x00dev, INT_SOURCE_CSR, ®); ++ ++ if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) { ++ /* Due to unknown reason the hardware generates a ++ * TX_FIFO_STATUS interrupt before the TX_STA_FIFO ++ * register contain valid data. Read the TX status ++ * here to see if we have to process the actual ++ * request. ++ */ ++ rt2x00mmio_register_read(rt2x00dev, TX_STA_FIFO, &txstatus); ++ if (rt2800mmio_txstatus_is_spurious(rt2x00dev, txstatus)) { ++ /* Remove the TX_FIFO_STATUS bit so it won't be ++ * processed in this turn. The hardware will ++ * generate another IRQ for us. ++ */ ++ rt2x00_set_field32(®, ++ INT_SOURCE_CSR_TX_FIFO_STATUS, 0); ++ } ++ } ++ ++ /* ACK interrupts */ + rt2x00mmio_register_write(rt2x00dev, INT_SOURCE_CSR, reg); + + if (!reg) +@@ -477,7 +525,7 @@ irqreturn_t rt2800mmio_interrupt(int irq + mask = ~reg; + + if (rt2x00_get_field32(reg, INT_SOURCE_CSR_TX_FIFO_STATUS)) { +- rt2800mmio_txstatus_interrupt(rt2x00dev); ++ rt2800mmio_txstatus_interrupt(rt2x00dev, txstatus); + /* + * Never disable the TX_FIFO_STATUS interrupt. + */ +--- a/drivers/net/wireless/rt2x00/rt2x00.h ++++ b/drivers/net/wireless/rt2x00/rt2x00.h +@@ -989,6 +989,11 @@ struct rt2x00_dev { + int rf_channel; + + /* ++ * Counter for tx status irq retries (rt2800pci). ++ */ ++ unsigned int txstatus_irq_retries; ++ ++ /* + * Protect the interrupt mask register. + */ + spinlock_t irqmask_lock; |