Revert "USB: pl2303: distinguish between original and cloned HX chips"

This reverts commit 7d26a78f62ff4fb08bc5ba740a8af4aa7ac67da4.

Revert all of the pl2303 changes that went into 3.12-rc1 and -rc2 as
they cause regressions on some versions of the chip.  This will all be
revisited for later kernel versions when we can figure out how to handle
this in a way that does not break working devices.

Reported-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Frank Schäfer <fschaefer.oss@googlemail.com>
Acked-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/serial/pl2303.c b/drivers/usb/serial/pl2303.c
index bedf8e4..e7a84f0 100644 (file)
--- a/drivers/usb/serial/pl2303.c
+++ b/drivers/usb/serial/pl2303.c
@@ -139,7 +139,6 @@ enum pl2303_type {
        HX_TA,          /* HX(A) / X(A) / TA version  */ /* TODO: improve */
        HXD_EA_RA_SA,   /* HXD / EA / RA / SA version */ /* TODO: improve */
        TB,             /* TB version */
-       HX_CLONE,       /* Cheap and less functional clone of the HX chip */
 };
 /*
  * NOTE: don't know the difference between type 0 and type 1,
@@ -207,23 +206,8 @@ static int pl2303_startup(struct usb_serial *serial)
                 * the device descriptors of the X/HX, HXD, EA, RA, SA, TA, TB
                 */
                if (le16_to_cpu(serial->dev->descriptor.bcdDevice) == 0x300) {
-                       /* Check if the device is a clone */
-                       pl2303_vendor_read(0x9494, 0, serial, buf);
-                       /*
-                        * NOTE: Not sure if this read is really needed.
-                        * The HX returns 0x00, the clone 0x02, but the Windows
-                        * driver seems to ignore the value and continues.
-                        */
-                       pl2303_vendor_write(0x0606, 0xaa, serial);
-                       pl2303_vendor_read(0x8686, 0, serial, buf);
-                       if (buf[0] != 0xaa) {
-                               type = HX_CLONE;
-                               type_str = "X/HX clone (limited functionality)";
-                       } else {
-                               type = HX_TA;
-                               type_str = "X/HX/TA";
-                       }
-                       pl2303_vendor_write(0x0606, 0x00, serial);
+                       type = HX_TA;
+                       type_str = "X/HX/TA";
                } else if (le16_to_cpu(serial->dev->descriptor.bcdDevice)
                                                                     == 0x400) {
                        type = HXD_EA_RA_SA;
@@ -321,9 +305,8 @@ static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,
 {
        /*
         * NOTE: Only the values defined in baud_sup are supported !
-        * => if unsupported values are set, the PL2303 uses 9600 baud instead
-        * => HX clones just don't work at unsupported baud rates < 115200 baud,
-        *    for baud rates > 115200 they run at 115200 baud
+        *       => if unsupported values are set, the PL2303 seems to
+        *          use 9600 baud (at least my PL2303X always does)
         */
        const int baud_sup[] = { 75, 150, 300, 600, 1200, 1800, 2400, 3600,
                                 4800, 7200, 9600, 14400, 19200, 28800, 38400,
@@ -333,14 +316,14 @@ static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,
         * NOTE: With the exception of type_0/1 devices, the following
         * additional baud rates are supported (tested with HX rev. 3A only):
         * 110*, 56000*, 128000, 134400, 161280, 201600, 256000*, 268800,
-        * 403200, 806400.      (*: not HX and HX clones)
+        * 403200, 806400.      (*: not HX)
         *
         * Maximum values: HXD, TB: 12000000; HX, TA: 6000000;
-        *                 type_0+1: 1228800; RA: 921600; HX clones, SA: 115200
+        *                 type_0+1: 1228800; RA: 921600; SA: 115200
         *
         * As long as we are not using this encoding method for anything else
-        * than the type_0+1, HX and HX clone chips, there is no point in
-        * complicating the code to support them.
+        * than the type_0+1 and HX chips, there is no point in complicating
+        * the code to support them.
         */
        int i;
 
@@ -364,8 +347,6 @@ static int pl2303_baudrate_encode_direct(int baud, enum pl2303_type type,
                baud = min_t(int, baud, 6000000);
        else if (type == type_0 || type == type_1)
                baud = min_t(int, baud, 1228800);
-       else if (type == HX_CLONE)
-               baud = min_t(int, baud, 115200);
        /* Direct (standard) baud rate encoding method */
        put_unaligned_le32(baud, buf);
 
@@ -378,8 +359,7 @@ static int pl2303_baudrate_encode_divisor(int baud, enum pl2303_type type,
        /*
         * Divisor based baud rate encoding method
         *
-        * NOTE: HX clones do NOT support this method.
-        * It's not clear if the type_0/1 chips support it.
+        * NOTE: it's not clear if the type_0/1 chips support this method
         *
         * divisor = 12MHz * 32 / baudrate = 2^A * B
         *
@@ -472,7 +452,7 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
         * 1) Direct method: encodes the baud rate value directly
         *    => supported by all chip types
         * 2) Divisor based method: encodes a divisor to a base value (12MHz*32)
-        *    => not supported by HX clones (and likely type_0/1 chips)
+        *    => supported by HX chips (and likely not by type_0/1 chips)
         *
         * NOTE: Although the divisor based baud rate encoding method is much
         * more flexible, some of the standard baud rate values can not be
@@ -480,7 +460,7 @@ static void pl2303_encode_baudrate(struct tty_struct *tty,
         * the device likely uses the same baud rate generator for both methods
         * so that there is likley no difference.
         */
-       if (type == type_0 || type == type_1 || type == HX_CLONE)
+       if (type == type_0 || type == type_1)
                baud = pl2303_baudrate_encode_direct(baud, type, buf);
        else
                baud = pl2303_baudrate_encode_divisor(baud, type, buf);
@@ -833,7 +813,6 @@ static void pl2303_break_ctl(struct tty_struct *tty, int break_state)
        result = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
                                 BREAK_REQUEST, BREAK_REQUEST_TYPE, state,
                                 0, NULL, 0, 100);
-       /* NOTE: HX clones don't support sending breaks, -EPIPE is returned */
        if (result)
                dev_err(&port->dev, "error sending break = %d\n", result);
 }