V4L/DVB (11284): Fix i2c code of flexcop-driver for rare revisions

This patch adds a workaround in the i2c-code of the flexcop-driver to
fix support for SkyStar2 rev 2.7. There are not many devices out
there, that's why this bug was not revealed earlier.

Signed-off-by: Patrick Boettcher <pb@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/media/dvb/b2c2/flexcop-i2c.c b/drivers/media/dvb/b2c2/flexcop-i2c.c
index f13783f08f0f..a0cfde18e640 100644
--- a/drivers/media/dvb/b2c2/flexcop-i2c.c
+++ b/drivers/media/dvb/b2c2/flexcop-i2c.c
@@ -47,6 +47,18 @@ static int flexcop_i2c_read4(struct flexcop_i2c_adapter *i2c,
         int len = r100.tw_sm_c_100.total_bytes, /* remember total_bytes is buflen-1 */
                 ret;
 
+        /* work-around to have CableStar2 and SkyStar2 rev 2.7 work
+         * correctly:
+         *
+         * the ITD1000 is behind an i2c-gate which closes automatically
+         * after an i2c-transaction the STV0297 needs 2 consecutive reads
+         * one with no_base_addr = 0 and one with 1
+         *
+         * those two work-arounds are conflictin: we check for the card
+         * type, it is set when probing the ITD1000 */
+        if (i2c->fc->dev_type == FC_SKY_REV27)
+                r100.tw_sm_c_100.no_base_addr_ack_error = i2c->no_base_addr;
+
         ret = flexcop_i2c_operation(i2c->fc, &r100);
         if (ret != 0) {
                 deb_i2c("Retrying operation\n");