[media] tuner/xc2028: Add I2C flush callback

When loading the firmware, complete each chunk by sending an I2C flush
command to the frontend. Some devices like the tm6000 seem to require
this to properly flush the I2C buffers.

The current code in tm6000 executes the flush command once after each
I2C transfer, which slows down the firmware loading especially when
loading large BASE type images.

Signed-off-by: Thierry Reding <thierry.reding@avionic-design.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 8 insertions, 0 deletions

diff --git a/drivers/media/common/tuners/tuner-xc2028.c b/drivers/media/common/tuners/tuner-xc2028.c
index 16fba6b59616..b6b2868cb3f0 100644
--- a/drivers/media/common/tuners/tuner-xc2028.c
+++ b/drivers/media/common/tuners/tuner-xc2028.c
@@ -614,6 +614,13 @@ static int load_firmware(struct dvb_frontend *fe, unsigned int type,
                         p += len;
                         size -= len;
                 }
+
+                /* silently fail if the frontend doesn't support I2C flush */
+                rc = do_tuner_callback(fe, XC2028_I2C_FLUSH, 0);
+                if ((rc < 0) && (rc != -EINVAL)) {
+                        tuner_err("error executing flush: %d\n", rc);
+                        return rc;
+                }
         }
         return 0;
 }
diff --git a/drivers/media/common/tuners/tuner-xc2028.h b/drivers/media/common/tuners/tuner-xc2028.h
index 9778c96a5006..9ebfb2d0ff14 100644
--- a/drivers/media/common/tuners/tuner-xc2028.h
+++ b/drivers/media/common/tuners/tuner-xc2028.h
@@ -54,6 +54,7 @@ struct xc2028_config {
 /* xc2028 commands for callback */
 #define XC2028_TUNER_RESET      0
 #define XC2028_RESET_CLK        1
+#define XC2028_I2C_FLUSH        2
 
 #if defined(CONFIG_MEDIA_TUNER_XC2028) || (defined(CONFIG_MEDIA_TUNER_XC2028_MODULE) && defined(MODULE))
 extern struct dvb_frontend *xc2028_attach(struct dvb_frontend *fe,