media: ddbridge: support dummy tuners with 125MByte/s dummy data stream

The Octopus V3 and Octopus Mini devices support set up of a dummy tuner
mode on port 0 that will deliver a continuous data stream of 125MBytes
per second while raising IRQs and filling the DMA buffers, which comes
handy for some stress, PCIe link and IRQ handling testing. The dummy
frontend is registered using dvb_dummy_fe's QAM dummy frontend. Set
ddbridge.dummy_tuner to 1 to enable this on the supported cards.

Picked up from the upstream dddvb-0.9.33 release.

Signed-off-by: Daniel Scheller <d.scheller@gmx.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>

diff --git a/drivers/media/pci/ddbridge/Kconfig b/drivers/media/pci/ddbridge/Kconfig
index a422dde2f34aab6445370fdafca4f354ca0e0773..16faef265e97dcb8b4d9dae2d2933180383e379c 100644 (file)
--- a/drivers/media/pci/ddbridge/Kconfig
+++ b/drivers/media/pci/ddbridge/Kconfig
@@ -14,6 +14,7 @@ config DVB_DDBRIDGE
        select MEDIA_TUNER_TDA18212 if MEDIA_SUBDRV_AUTOSELECT
        select DVB_MXL5XX if MEDIA_SUBDRV_AUTOSELECT
        select DVB_CXD2099 if MEDIA_SUBDRV_AUTOSELECT
+       select DVB_DUMMY_FE if MEDIA_SUBDRV_AUTOSELECT
        ---help---
          Support for cards with the Digital Devices PCI express bridge:
          - Octopus PCIe Bridge

diff --git a/drivers/media/pci/ddbridge/ddbridge-core.c b/drivers/media/pci/ddbridge/ddbridge-core.c
index c01a75f5ecd4dcb55c0541baae6f529dba5e4daf..8b9244993747ac782140d04e70f143228e22c9eb 100644 (file)
--- a/drivers/media/pci/ddbridge/ddbridge-core.c
+++ b/drivers/media/pci/ddbridge/ddbridge-core.c
@@ -54,6 +54,7 @@
 #include "stv6111.h"
 #include "lnbh25.h"
 #include "cxd2099.h"
+#include "dvb_dummy_fe.h"
 
 /****************************************************************************/
 
@@ -105,6 +106,11 @@ module_param(dma_buf_size, int, 0444);
 MODULE_PARM_DESC(dma_buf_size,
                 "DMA buffer size as multiple of 128*47, possible values: 1-43");
 
+static int dummy_tuner;
+module_param(dummy_tuner, int, 0444);
+MODULE_PARM_DESC(dummy_tuner,
+                "attach dummy tuner to port 0 on Octopus V3 or Octopus Mini cards");
+
 /****************************************************************************/
 
 static DEFINE_MUTEX(redirect_lock);
@@ -535,6 +541,9 @@ static void ddb_input_start(struct ddb_input *input)
 
        ddbwritel(dev, 0x09, TS_CONTROL(input));
 
+       if (input->port->type == DDB_TUNER_DUMMY)
+               ddbwritel(dev, 0x000fff01, TS_CONTROL2(input));
+
        input->dma->running = 1;
        spin_unlock_irq(&input->dma->lock);
 }
@@ -1240,6 +1249,20 @@ static int tuner_attach_stv6111(struct ddb_input *input, int type)
        return 0;
 }
 
+static int demod_attach_dummy(struct ddb_input *input)
+{
+       struct ddb_dvb *dvb = &input->port->dvb[input->nr & 1];
+       struct device *dev = input->port->dev->dev;
+
+       dvb->fe = dvb_attach(dvb_dummy_fe_qam_attach);
+       if (!dvb->fe) {
+               dev_err(dev, "QAM dummy attach failed!\n");
+               return -ENODEV;
+       }
+
+       return 0;
+}
+
 static int start_feed(struct dvb_demux_feed *dvbdmxfeed)
 {
        struct dvb_demux *dvbdmx = dvbdmxfeed->demux;
@@ -1532,6 +1555,10 @@ static int dvb_input_attach(struct ddb_input *input)
                if (tuner_attach_tda18212(input, port->type) < 0)
                        goto err_tuner;
                break;
+       case DDB_TUNER_DUMMY:
+               if (demod_attach_dummy(input) < 0)
+                       goto err_detach;
+               break;
        default:
                return 0;
        }
@@ -1794,6 +1821,15 @@ static void ddb_port_probe(struct ddb_port *port)
 
        /* Handle missing ports and ports without I2C */
 
+       if (dummy_tuner && !port->nr &&
+           dev->link[0].ids.device == 0x0005) {
+               port->name = "DUMMY";
+               port->class = DDB_PORT_TUNER;
+               port->type = DDB_TUNER_DUMMY;
+               port->type_name = "DUMMY";
+               return;
+       }
+
        if (port->nr == ts_loop) {
                port->name = "TS LOOP";
                port->class = DDB_PORT_LOOP;

diff --git a/drivers/media/pci/ddbridge/ddbridge.h b/drivers/media/pci/ddbridge/ddbridge.h
index 86db6f19369a627fc3644f22a4304206e647ede5..cb69021a3443267c0c7c893823d46e18f15be782 100644 (file)
--- a/drivers/media/pci/ddbridge/ddbridge.h
+++ b/drivers/media/pci/ddbridge/ddbridge.h
@@ -236,6 +236,7 @@ struct ddb_port {
        char                   *name;
        char                   *type_name;
        u32                     type;
+#define DDB_TUNER_DUMMY          0xffffffff
 #define DDB_TUNER_NONE           0
 #define DDB_TUNER_DVBS_ST        1
 #define DDB_TUNER_DVBS_ST_AA     2