From: Stefan Agner <stefan@agner.ch>
To: johan@kernel.org
Cc: gregkh@linuxfoundation.org, linux-usb@vger.kernel.org,
linux-kernel@vger.kernel.org, stefan@agner.ch
Subject: [PATCH] USB: serial: cp210x: Fix alternate function for CP2102N QFN20
Date: Fri, 28 May 2021 22:39:31 +0200 [thread overview]
Message-ID: <51830b2b24118eb0f77c5c9ac64ffb2f519dbb1d.1622218300.git.stefan@agner.ch> (raw)
The QFN20 part has a different GPIO/port function assignment. The
configuration struct bit field ordered as TX/RX/RS485/WAKEUP/CLK
which exactly matches GPIO0-3 for QFN24/28. However, QFN20 has a
different GPIO to primary function assignment.
Special case QFN20 to follow to properly detect which GPIOs are
available.
Signed-off-by: Stefan Agner <stefan@agner.ch>
---
Tested on a custom PCB with a CP2102N QFP20 device. I noticed the bug after
configuring GPIO.2/3 to be TX/RX LED.
--
Stefan
drivers/usb/serial/cp210x.c | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/cp210x.c b/drivers/usb/serial/cp210x.c
index ee595d1bea0a..c9f8ebd34122 100644
--- a/drivers/usb/serial/cp210x.c
+++ b/drivers/usb/serial/cp210x.c
@@ -537,6 +537,12 @@ struct cp210x_single_port_config {
#define CP210X_2NCONFIG_GPIO_RSTLATCH_IDX 587
#define CP210X_2NCONFIG_GPIO_CONTROL_IDX 600
+/* CP2102N QFN20 port configuration values */
+#define CP2102N_QFN20_GPIO2_TXLED_MODE BIT(2)
+#define CP2102N_QFN20_GPIO3_RXLED_MODE BIT(3)
+#define CP2102N_QFN20_GPIO1_RS485_MODE BIT(4)
+#define CP2102N_QFN20_GPIO0_CLK_MODE BIT(6)
+
/* CP210X_VENDOR_SPECIFIC, CP210X_WRITE_LATCH call writes these 0x2 bytes. */
struct cp210x_gpio_write {
u8 mask;
@@ -1733,7 +1739,19 @@ static int cp2102n_gpioconf_init(struct usb_serial *serial)
priv->gpio_pushpull = (gpio_pushpull >> 3) & 0x0f;
/* 0 indicates GPIO mode, 1 is alternate function */
- priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
+ if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN20) {
+ /* QFN20 is special... */
+ if (gpio_ctrl & CP2102N_QFN20_GPIO0_CLK_MODE) /* GPIO 0 */
+ priv->gpio_altfunc |= BIT(0);
+ if (gpio_ctrl & CP2102N_QFN20_GPIO1_RS485_MODE) /* GPIO 1 */
+ priv->gpio_altfunc |= BIT(1);
+ if (gpio_ctrl & CP2102N_QFN20_GPIO2_TXLED_MODE) /* GPIO 2 */
+ priv->gpio_altfunc |= BIT(2);
+ if (gpio_ctrl & CP2102N_QFN20_GPIO3_RXLED_MODE) /* GPIO 3 */
+ priv->gpio_altfunc |= BIT(3);
+ } else {
+ priv->gpio_altfunc = (gpio_ctrl >> 2) & 0x0f;
+ }
if (priv->partnum == CP210X_PARTNUM_CP2102N_QFN28) {
/*
--
2.31.1
next reply other threads:[~2021-05-28 20:39 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-28 20:39 Stefan Agner [this message]
2021-06-10 7:53 ` [PATCH] USB: serial: cp210x: Fix alternate function for CP2102N QFN20 Johan Hovold
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