From 0d3674084c89130bcaf15b1a69881b31f198ee72 Mon Sep 17 00:00:00 2001 From: Bing Zhao Date: Fri, 28 Mar 2014 14:54:39 -0700 Subject: [PATCH] Bluetooth: btmrvl: implement read-to-clear for SD8897 interrupts For SD8897, CMD52 write_to_clear may have missing interrupts under certain corner case condition. Use CMD53 read-to-clear to fix the problem. Signed-off-by: Bing Zhao Signed-off-by: Marcel Holtmann --- drivers/bluetooth/btmrvl_drv.h | 2 ++ drivers/bluetooth/btmrvl_main.c | 17 +++++++++++ drivers/bluetooth/btmrvl_sdio.c | 52 ++++++++++++++++++++++++++++++++- drivers/bluetooth/btmrvl_sdio.h | 3 ++ 4 files changed, 73 insertions(+), 1 deletion(-) diff --git a/drivers/bluetooth/btmrvl_drv.h b/drivers/bluetooth/btmrvl_drv.h index 7399303d7d99..199ff492da26 100644 --- a/drivers/bluetooth/btmrvl_drv.h +++ b/drivers/bluetooth/btmrvl_drv.h @@ -59,6 +59,8 @@ struct btmrvl_device { }; struct btmrvl_adapter { + void *hw_regs_buf; + u8 *hw_regs; u32 int_count; struct sk_buff_head tx_queue; u8 psmode; diff --git a/drivers/bluetooth/btmrvl_main.c b/drivers/bluetooth/btmrvl_main.c index 2c4997ce2484..5c0b9444b5e1 100644 --- a/drivers/bluetooth/btmrvl_main.c +++ b/drivers/bluetooth/btmrvl_main.c @@ -24,6 +24,7 @@ #include #include "btmrvl_drv.h" +#include "btmrvl_sdio.h" #define VERSION "1.0" @@ -337,10 +338,25 @@ static int btmrvl_tx_pkt(struct btmrvl_private *priv, struct sk_buff *skb) static void btmrvl_init_adapter(struct btmrvl_private *priv) { + int buf_size; + skb_queue_head_init(&priv->adapter->tx_queue); priv->adapter->ps_state = PS_AWAKE; + buf_size = ALIGN_SZ(SDIO_BLOCK_SIZE, BTSDIO_DMA_ALIGN); + priv->adapter->hw_regs_buf = kzalloc(buf_size, GFP_KERNEL); + if (!priv->adapter->hw_regs_buf) { + priv->adapter->hw_regs = NULL; + BT_ERR("Unable to allocate buffer for hw_regs."); + } else { + priv->adapter->hw_regs = + (u8 *)ALIGN_ADDR(priv->adapter->hw_regs_buf, + BTSDIO_DMA_ALIGN); + BT_DBG("hw_regs_buf=%p hw_regs=%p", + priv->adapter->hw_regs_buf, priv->adapter->hw_regs); + } + init_waitqueue_head(&priv->adapter->cmd_wait_q); } @@ -348,6 +364,7 @@ static void btmrvl_free_adapter(struct btmrvl_private *priv) { skb_queue_purge(&priv->adapter->tx_queue); + kfree(priv->adapter->hw_regs_buf); kfree(priv->adapter); priv->adapter = NULL; diff --git a/drivers/bluetooth/btmrvl_sdio.c b/drivers/bluetooth/btmrvl_sdio.c index 7883793717fd..9dedca516ff5 100644 --- a/drivers/bluetooth/btmrvl_sdio.c +++ b/drivers/bluetooth/btmrvl_sdio.c @@ -64,6 +64,7 @@ static const struct btmrvl_sdio_card_reg btmrvl_reg_8688 = { .io_port_0 = 0x00, .io_port_1 = 0x01, .io_port_2 = 0x02, + .int_read_to_clear = false, }; static const struct btmrvl_sdio_card_reg btmrvl_reg_87xx = { .cfg = 0x00, @@ -80,6 +81,7 @@ static const struct btmrvl_sdio_card_reg btmrvl_reg_87xx = { .io_port_0 = 0x78, .io_port_1 = 0x79, .io_port_2 = 0x7a, + .int_read_to_clear = false, }; static const struct btmrvl_sdio_card_reg btmrvl_reg_88xx = { @@ -97,6 +99,9 @@ static const struct btmrvl_sdio_card_reg btmrvl_reg_88xx = { .io_port_0 = 0xd8, .io_port_1 = 0xd9, .io_port_2 = 0xda, + .int_read_to_clear = true, + .host_int_rsr = 0x01, + .card_misc_cfg = 0xcc, }; static const struct btmrvl_sdio_device btmrvl_sdio_sd8688 = { @@ -667,6 +672,23 @@ static int btmrvl_sdio_process_int_status(struct btmrvl_private *priv) return 0; } +static int btmrvl_sdio_read_to_clear(struct btmrvl_sdio_card *card, u8 *ireg) +{ + struct btmrvl_adapter *adapter = card->priv->adapter; + int ret; + + ret = sdio_readsb(card->func, adapter->hw_regs, 0, SDIO_BLOCK_SIZE); + if (ret) { + BT_ERR("sdio_readsb: read int hw_regs failed: %d", ret); + return ret; + } + + *ireg = adapter->hw_regs[card->reg->host_intstatus]; + BT_DBG("hw_regs[%#x]=%#x", card->reg->host_intstatus, *ireg); + + return 0; +} + static int btmrvl_sdio_write_to_clear(struct btmrvl_sdio_card *card, u8 *ireg) { int ret; @@ -714,7 +736,11 @@ static void btmrvl_sdio_interrupt(struct sdio_func *func) priv = card->priv; - ret = btmrvl_sdio_write_to_clear(card, &ireg); + if (card->reg->int_read_to_clear) + ret = btmrvl_sdio_read_to_clear(card, &ireg); + else + ret = btmrvl_sdio_write_to_clear(card, &ireg); + if (ret) return; @@ -788,6 +814,30 @@ static int btmrvl_sdio_register_dev(struct btmrvl_sdio_card *card) BT_DBG("SDIO FUNC%d IO port: 0x%x", func->num, card->ioport); + if (card->reg->int_read_to_clear) { + reg = sdio_readb(func, card->reg->host_int_rsr, &ret); + if (ret < 0) { + ret = -EIO; + goto release_irq; + } + sdio_writeb(func, reg | 0x3f, card->reg->host_int_rsr, &ret); + if (ret < 0) { + ret = -EIO; + goto release_irq; + } + + reg = sdio_readb(func, card->reg->card_misc_cfg, &ret); + if (ret < 0) { + ret = -EIO; + goto release_irq; + } + sdio_writeb(func, reg | 0x10, card->reg->card_misc_cfg, &ret); + if (ret < 0) { + ret = -EIO; + goto release_irq; + } + } + sdio_set_drvdata(func, card); sdio_release_host(func); diff --git a/drivers/bluetooth/btmrvl_sdio.h b/drivers/bluetooth/btmrvl_sdio.h index 43d35a609ca9..d4dd3b0fa53d 100644 --- a/drivers/bluetooth/btmrvl_sdio.h +++ b/drivers/bluetooth/btmrvl_sdio.h @@ -78,6 +78,9 @@ struct btmrvl_sdio_card_reg { u8 io_port_0; u8 io_port_1; u8 io_port_2; + bool int_read_to_clear; + u8 host_int_rsr; + u8 card_misc_cfg; }; struct btmrvl_sdio_card { -- 2.20.1