serial: 8250_pci: Add WCH CH352 quirk to avoid Xscale detection

The code in 8250.c for detecting ARM/XScale UARTs says:

  * Try writing and reading the UART_IER_UUE bit (b6).
  * If it works, this is probably one of the Xscale platform's
  * internal UARTs.

If the above passes, it then goes on to:

     * It's an Xscale.
     * We'll leave the UART_IER_UUE bit set to 1 (enabled).

However, the CH352 uses the UART_IER_UUE as the LOWPOWER function,
so it is readable and writable.  According to the datasheet:

    "LOWPOWER:When the bit is 1, close the internal benchmark
     clock of serial port to set into low-power status.

So it essentially gets mis-detected as Xscale, and gets
powered down in the process.  The device in question where
this was seen is listed by lspci as:

 Serial controller: Device 4348:3253 (rev 10) (prog-if 02 [16550])

Re-using the 353 quirk which just sets flags to fixed and type
to 16550 is suitable for fixing the 352 as well.

Signed-off-by: Wang YanQing <udknight@gmail.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/8250/8250_pci.c b/drivers/tty/serial/8250/8250_pci.c
index aa76825..26e3a97 100644 (file)
--- a/drivers/tty/serial/8250/8250_pci.c
+++ b/drivers/tty/serial/8250/8250_pci.c
@@ -1554,6 +1554,7 @@ pci_wch_ch353_setup(struct serial_private *priv,
 #define PCI_DEVICE_ID_PLX_CRONYX_OMEGA 0xc001
 #define PCI_DEVICE_ID_INTEL_PATSBURG_KT 0x1d3d
 #define PCI_VENDOR_ID_WCH              0x4348
+#define PCI_DEVICE_ID_WCH_CH352_2S     0x3253
 #define PCI_DEVICE_ID_WCH_CH353_4S     0x3453
 #define PCI_DEVICE_ID_WCH_CH353_2S1PF  0x5046
 #define PCI_DEVICE_ID_WCH_CH353_2S1P   0x7053
@@ -2172,6 +2173,14 @@ static struct pci_serial_quirk pci_serial_quirks[] __refdata = {
                .subdevice      = PCI_ANY_ID,
                .setup          = pci_wch_ch353_setup,
        },
+       /* WCH CH352 2S card (16550 clone) */
+       {
+               .vendor         = PCI_VENDOR_ID_WCH,
+               .device         = PCI_DEVICE_ID_WCH_CH352_2S,
+               .subvendor      = PCI_ANY_ID,
+               .subdevice      = PCI_ANY_ID,
+               .setup          = pci_wch_ch353_setup,
+       },
        /*
         * ASIX devices with FIFO bug
         */
@@ -4870,6 +4879,10 @@ static struct pci_device_id serial_pci_tbl[] = {
                PCI_ANY_ID, PCI_ANY_ID,
                0, 0, pbn_b0_bt_2_115200 },
 
+       {       PCI_VENDOR_ID_WCH, PCI_DEVICE_ID_WCH_CH352_2S,
+               PCI_ANY_ID, PCI_ANY_ID,
+               0, 0, pbn_b0_bt_2_115200 },
+
        /*
         * Commtech, Inc. Fastcom adapters
         */