target/linux/s3c24xx/patches/0242-silence-serial-console-gta01.patch.patch

   1 From 85ef1fb82db8188fd5a615e557bf5407113d163f Mon Sep 17 00:00:00 2001
   2 From: Mike Westerhof <mwester@dls.net>
   3 Date: Sun, 10 Aug 2008 09:13:20 +0100
   4 Subject: [PATCH] silence-serial-console-gta01.patch
   5
   6     This patch ensures that no console data will go the UART while
   7     the GSM mux is switched to the GSM.  This is necessary despite
   8     the code that disables the console due to the fact that the
   9     console resumes before the neo1973_pm_gsm driver, and consoles
  10     always resume in the "on" state.
  11
  12 Signed-off-by: Mike Westerhof <mwester@dls.net>
  13 ---
  14  arch/arm/plat-s3c24xx/neo1973_pm_gsm.c |    3 +++
  15  drivers/serial/s3c2410.c               |   10 ++++++++++
  16  2 files changed, 13 insertions(+), 0 deletions(-)
  17
  18 diff --git a/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c b/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c
  19 index 901f8fb..8d5e41c 100644
  20 --- a/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c
  21 +++ b/arch/arm/plat-s3c24xx/neo1973_pm_gsm.c
  22 @@ -31,6 +31,7 @@
  23  #include <asm/arch/regs-gpioj.h>
  24  #endif
  25
  26 +extern void s3c24xx_serial_console_set_silence(int silence);
  27  extern void s3c24xx_serial_register_resume_dependency(struct resume_dependency *
  28                                              resume_dependency, int uart_index);
  29
  30 @@ -105,6 +106,7 @@ static ssize_t gsm_write(struct device *dev, struct device_attribute *attr,
  31                                          "disconnecting serial console\n");
  32
  33                                 console_stop(gta01_gsm.con);
  34 +                               s3c24xx_serial_console_set_silence(1);
  35                         }
  36
  37                         if (gta01_gsm.gpio_ngsm_en)
  38 @@ -144,6 +146,7 @@ static ssize_t gsm_write(struct device *dev, struct device_attribute *attr,
  39                                 s3c2410_gpio_setpin(gta01_gsm.gpio_ngsm_en, 1);
  40
  41                         if (gta01_gsm.con) {
  42 +                               s3c24xx_serial_console_set_silence(0);
  43                                 console_start(gta01_gsm.con);
  44
  45                                 dev_dbg(dev, "powered down GSM, thus enabling "
  46 diff --git a/drivers/serial/s3c2410.c b/drivers/serial/s3c2410.c
  47 index d0b55b1..8de1564 100644
  48 --- a/drivers/serial/s3c2410.c
  49 +++ b/drivers/serial/s3c2410.c
  50 @@ -1791,6 +1791,13 @@ module_exit(s3c24xx_serial_modexit);
  51  #ifdef CONFIG_SERIAL_S3C2410_CONSOLE
  52
  53  static struct uart_port *cons_uart;
  54 +static int cons_silenced;
  55 +
  56 +void s3c24xx_serial_console_set_silence(int silenced)
  57 +{
  58 +       cons_silenced = silenced;
  59 +}
  60 +EXPORT_SYMBOL(s3c24xx_serial_console_set_silence);
  61
  62  static int
  63  s3c24xx_serial_console_txrdy(struct uart_port *port, unsigned int ufcon)
  64 @@ -1817,6 +1824,9 @@ s3c24xx_serial_console_putchar(struct uart_port *port, int ch)
  65         unsigned int ufcon = rd_regl(cons_uart, S3C2410_UFCON);
  66         unsigned int umcon = rd_regl(cons_uart, S3C2410_UMCON);
  67
  68 +       if (cons_silenced)
  69 +               return;
  70 +
  71         /* If auto HW flow control enabled, temporarily turn it off */
  72         if (umcon & S3C2410_UMCOM_AFC)
  73                 wr_regl(port, S3C2410_UMCON, (umcon & !S3C2410_UMCOM_AFC));
  74 --
  75 1.5.6.3
  76