V4L/DVB: configurable IRQ from CAM

IRQ from CAM disabled by default. In some environment enabled IRQ can cause of
machine freeze.

Signed-off-by: Abylay Ospan <aospan@netup.ru>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 9 insertions, 3 deletions

diff --git a/drivers/media/video/cx23885/cimax2.c b/drivers/media/video/cx23885/cimax2.c
index d4a9d2c5947c..c95e7bc14745 100644
--- a/drivers/media/video/cx23885/cimax2.c
+++ b/drivers/media/video/cx23885/cimax2.c
@@ -60,12 +60,18 @@ static unsigned int ci_dbg;
 module_param(ci_dbg, int, 0644);
 MODULE_PARM_DESC(ci_dbg, "Enable CI debugging");
 
+static unsigned int ci_irq_enable;
+module_param(ci_irq_enable, int, 0644);
+MODULE_PARM_DESC(ci_irq_enable, "Enable IRQ from CAM");
+
 #define ci_dbg_print(args...) \
         do { \
                 if (ci_dbg) \
                         printk(KERN_DEBUG args); \
         } while (0)
 
+#define ci_irq_flags() (ci_irq_enable ? NETUP_IRQ_IRQAM : 0)
+
 /* stores all private variables for communication with CI */
 struct netup_ci_state {
         struct dvb_ca_en50221 ca;
@@ -392,7 +398,7 @@ int netup_poll_ci_slot_status(struct dvb_ca_en50221 *en50221, int slot, int open
         if (0 != slot)
                 return -EINVAL;
 
-        netup_ci_set_irq(en50221, open ? (NETUP_IRQ_DETAM | NETUP_IRQ_IRQAM)
+        netup_ci_set_irq(en50221, open ? (NETUP_IRQ_DETAM | ci_irq_flags())
                         : NETUP_IRQ_DETAM);
 
         return state->status;
@@ -429,7 +435,7 @@ int netup_ci_init(struct cx23885_tsport *port)
                 0x01, /* power on (use it like store place) */
                 0x00, /* RFU */
                 0x00, /* int status read only */
-                NETUP_IRQ_IRQAM | NETUP_IRQ_DETAM, /* DETAM, IRQAM unmasked */
+                ci_irq_flags() | NETUP_IRQ_DETAM, /* DETAM, IRQAM unmasked */
                 0x05, /* EXTINT=active-high, INT=push-pull */
                 0x00, /* USCG1 */
                 0x04, /* ack active low */
@@ -470,7 +476,7 @@ int netup_ci_init(struct cx23885_tsport *port)
         state->ca.poll_slot_status = netup_poll_ci_slot_status;
         state->ca.data = state;
         state->priv = port;
-        state->current_irq_mode = NETUP_IRQ_IRQAM | NETUP_IRQ_DETAM;
+        state->current_irq_mode = ci_irq_flags() | NETUP_IRQ_DETAM;
 
         ret = netup_write_i2c(state->i2c_adap, state->ci_i2c_addr,
                                                 0, &cimax_init[0], 34);