rtlwifi: rtl8192cu: Change firmware upload to use block writes

Driver rtl8192cu writes the firmware with 32-bit asynchronous writes. This
design is OK for USB 2.0 adapters, but the current implementation of
xhcu-hcd has a limited ring size, which is exceeded. By converting to
synchronous block writes, this error is avoided.
Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/rtlwifi/rtl8192c/fw_common.c

@@ -72,6 +72,34 @@ static void _rtl92c_enable_fw_download(struct ieee80211_hw *hw, bool enable)
 	}
 }
 
+static void rtl_block_fw_writeN(struct ieee80211_hw *hw, const u8 *buffer,
+				u32 size)
+{
+	struct rtl_priv *rtlpriv = rtl_priv(hw);
+	u32 blockSize = REALTEK_USB_VENQT_MAX_BUF_SIZE - 20;
+	u8 *bufferPtr = (u8 *) buffer;
+	u32 i, offset, blockCount, remainSize;
+
+	blockCount = size / blockSize;
+	remainSize = size % blockSize;
+
+	for (i = 0; i < blockCount; i++) {
+		offset = i * blockSize;
+		rtlpriv->io.writeN_sync(rtlpriv,
+					(FW_8192C_START_ADDRESS + offset),
+					(void *)(bufferPtr + offset),
+					blockSize);
+	}
+
+	if (remainSize) {
+		offset = blockCount * blockSize;
+		rtlpriv->io.writeN_sync(rtlpriv,
+					(FW_8192C_START_ADDRESS + offset),
+					(void *)(bufferPtr + offset),
+					remainSize);
+	}
+}
+
 static void _rtl92c_fw_block_write(struct ieee80211_hw *hw,
 				   const u8 *buffer, u32 size)
 {
@@ -81,6 +109,10 @@ static void _rtl92c_fw_block_write(struct ieee80211_hw *hw,
 	u32 *pu4BytePtr = (u32 *) buffer;
 	u32 i, offset, blockCount, remainSize;
 
+	if (rtlpriv->io.writeN_sync) {
+		rtl_block_fw_writeN(hw, buffer, size);
+		return;
+	}
 	blockCount = size / blockSize;
 	remainSize = size % blockSize;
 

drivers/net/wireless/rtlwifi/rtl8192c/fw_common.h

@@ -94,5 +94,6 @@ void rtl92c_firmware_selfreset(struct ieee80211_hw *hw);
 void rtl92c_set_fw_pwrmode_cmd(struct ieee80211_hw *hw, u8 mode);
 void rtl92c_set_fw_rsvdpagepkt(struct ieee80211_hw *hw, bool b_dl_finished);
 void rtl92c_set_fw_joinbss_report_cmd(struct ieee80211_hw *hw, u8 mstatus);
+void usb_writeN_async(struct rtl_priv *rtlpriv, u32 addr, void *data, u16 len);
 
 #endif

drivers/net/wireless/rtlwifi/rtl8192cu/mac.c

@@ -84,6 +84,7 @@ void rtl92c_read_chip_version(struct ieee80211_hw *hw)
 		}
 	}
 	rtlhal->version  = (enum version_8192c)chip_version;
+	pr_info("rtl8192cu: Chip version 0x%x\n", chip_version);
 	switch (rtlhal->version) {
 	case VERSION_NORMAL_TSMC_CHIP_92C_1T2R:
 		RT_TRACE(rtlpriv, COMP_INIT, DBG_TRACE,

drivers/net/wireless/rtlwifi/usb.c

@@ -40,7 +40,6 @@
 #define REALTEK_USB_VENQT_CMD_REQ		0x05
 #define	REALTEK_USB_VENQT_CMD_IDX		0x00
 
-#define REALTEK_USB_VENQT_MAX_BUF_SIZE		254
 #define MAX_USBCTRL_VENDORREQ_TIMES		10
 
 static void usbctrl_async_callback(struct urb *urb)
@@ -203,6 +202,30 @@ static void _usb_write32_async(struct rtl_priv *rtlpriv, u32 addr, u32 val)
 	_usb_write_async(to_usb_device(dev), addr, val, 4);
 }
 
+static void _usb_writeN_sync(struct rtl_priv *rtlpriv, u32 addr, void *data,
+			     u16 len)
+{
+	struct device *dev = rtlpriv->io.dev;
+	struct usb_device *udev = to_usb_device(dev);
+	u8 request = REALTEK_USB_VENQT_CMD_REQ;
+	u8 reqtype =  REALTEK_USB_VENQT_WRITE;
+	u16 wvalue;
+	u16 index = REALTEK_USB_VENQT_CMD_IDX;
+	int pipe = usb_sndctrlpipe(udev, 0); /* write_out */
+	u8 *buffer;
+	dma_addr_t dma_addr;
+
+	wvalue = (u16)(addr&0x0000ffff);
+	buffer = usb_alloc_coherent(udev, (size_t)len, GFP_ATOMIC, &dma_addr);
+	if (!buffer)
+		return;
+	memcpy(buffer, data, len);
+	usb_control_msg(udev, pipe, request, reqtype, wvalue,
+			index, buffer, len, 50);
+
+	usb_free_coherent(udev, (size_t)len, buffer, dma_addr);
+}
+
 static void _rtl_usb_io_handler_init(struct device *dev,
 				     struct ieee80211_hw *hw)
 {
@@ -216,6 +239,7 @@ static void _rtl_usb_io_handler_init(struct device *dev,
 	rtlpriv->io.read8_sync		= _usb_read8_sync;
 	rtlpriv->io.read16_sync		= _usb_read16_sync;
 	rtlpriv->io.read32_sync		= _usb_read32_sync;
+	rtlpriv->io.writeN_sync		= _usb_writeN_sync;
 }
 
 static void _rtl_usb_io_handler_release(struct ieee80211_hw *hw)

drivers/net/wireless/rtlwifi/wifi.h

@@ -63,6 +63,7 @@
 #define AC_MAX					4
 #define QOS_QUEUE_NUM				4
 #define RTL_MAC80211_NUM_QUEUE			5
+#define REALTEK_USB_VENQT_MAX_BUF_SIZE		254
 
 #define QBSS_LOAD_SIZE				5
 #define MAX_WMMELE_LENGTH			64
@@ -943,8 +944,10 @@ struct rtl_io {
 	unsigned long pci_base_addr;	/*device I/O address */
 
 	void (*write8_async) (struct rtl_priv *rtlpriv, u32 addr, u8 val);
-	void (*write16_async) (struct rtl_priv *rtlpriv, u32 addr, __le16 val);
-	void (*write32_async) (struct rtl_priv *rtlpriv, u32 addr, __le32 val);
+	void (*write16_async) (struct rtl_priv *rtlpriv, u32 addr, u16 val);
+	void (*write32_async) (struct rtl_priv *rtlpriv, u32 addr, u32 val);
+	void (*writeN_sync) (struct rtl_priv *rtlpriv, u32 addr, void *buf,
+			     u16 len);
 
 	u8(*read8_sync) (struct rtl_priv *rtlpriv, u32 addr);
 	u16(*read16_sync) (struct rtl_priv *rtlpriv, u32 addr);