Linux Kernels

V4L/DVB (9442): Revert back previous change to 90MHz

This change “V4L/DVB (9442): Revert back previous change to 90MHz” (commit 27a330d) in Linux kernel is authored by Manu Abraham <abraham.manu [at] gmail.com> on Mon Nov 19 16:44:47 2007 -0300.

Description of "V4L/DVB (9442): Revert back previous change to 90MHz"

The change “V4L/DVB (9442): Revert back previous change to 90MHz” introduces changes as follows.

V4L/DVB (9442): Revert back previous change to 90MHz

Note:
* At High Symbol Rates we do not have enouph machine cycles to handle the
  incoming symbols and hence might run into problems at the very end of the
  specified definition
* Most of the equations have been calculated for a master clock of 99 MHz,
  running at 90MHz, raises lot of issues such as the need to recalculate
  all of them , which is eventually very painful.

Signed-off-by: Manu Abraham <manu@linuxtv.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

Linux kernel releases containing commit 27a330d

The Linux kernel releases containing this commit are as follows.

Linux kernel code changes from "V4L/DVB (9442): Revert back previous change to 90MHz"

There are 6 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 drivers/media/dvb/frontends/stb0899_drv.c | 2 +-
 drivers/media/dvb/ttpci/budget-av.c       | 2 +-
 drivers/media/dvb/ttpci/budget-ci.c       | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)
 
diff --git a/drivers/media/dvb/frontends/stb0899_drv.c b/drivers/media/dvb/frontends/stb0899_drv.c
index 862b08685fb0..d21396450259 100644
--- a/drivers/media/dvb/frontends/stb0899_drv.c
+++ b/drivers/media/dvb/frontends/stb0899_drv.c
@@ -1575,7 +1575,7 @@ static enum dvbfe_search stb0899_search(struct dvb_frontend *fe, struct dvbfe_pa
 		if (i_params->srate <= 5000000)
 			stb0899_set_mclk(state, 76500000);
 		else
-			stb0899_set_mclk(state, 90000000);
+			stb0899_set_mclk(state, 99000000);
 
 		switch (state->delsys) {
 		case DVBFE_DELSYS_DVBS:
diff --git a/drivers/media/dvb/ttpci/budget-av.c b/drivers/media/dvb/ttpci/budget-av.c
index 1af2ecbea519..3459a9af7009 100644
--- a/drivers/media/dvb/ttpci/budget-av.c
+++ b/drivers/media/dvb/ttpci/budget-av.c
@@ -964,7 +964,7 @@ static const struct stb0899_s1_reg knc1_stb0899_s1_init_1[] = {
 	{ STB0899_GPIO37CFG		, 0x82 },
 	{ STB0899_GPIO38CFG		, 0x82 },
 	{ STB0899_GPIO39CFG		, 0x82 },
-	{ STB0899_NCOARSE		, 0x13 }, /* 0x13 = 27 Mhz Clock, F/3 = 180MHz, F/6 = 90MHz */
+	{ STB0899_NCOARSE		, 0x15 }, /* 0x15 = 27 Mhz Clock, F/3 = 198MHz, F/6 = 99MHz */
 	{ STB0899_SYNTCTRL		, 0x02 }, /* 0x00 = CLK from CLKI, 0x02 = CLK from XTALI */
 	{ STB0899_FILTCTRL		, 0x00 },
 	{ STB0899_SYSCTRL		, 0x00 },
diff --git a/drivers/media/dvb/ttpci/budget-ci.c b/drivers/media/dvb/ttpci/budget-ci.c
index 86e9f6d82aad..ae9af21bda6c 100644
--- a/drivers/media/dvb/ttpci/budget-ci.c
+++ b/drivers/media/dvb/ttpci/budget-ci.c
@@ -1153,7 +1153,7 @@ static const struct stb0899_s1_reg tt3200_stb0899_s1_init_1[] = {
 	{ STB0899_GPIO37CFG		, 0x82 },
 	{ STB0899_GPIO38CFG		, 0x82 },
 	{ STB0899_GPIO39CFG		, 0x82 },
-	{ STB0899_NCOARSE       	, 0x13 }, /* 0x13 = 27 Mhz Clock, F/3 = 180MHz, F/6 = 90MHz */
+	{ STB0899_NCOARSE       	, 0x15 }, /* 0x15 = 27 Mhz Clock, F/3 = 198MHz, F/6 = 99MHz */
 	{ STB0899_SYNTCTRL      	, 0x02 }, /* 0x00 = CLK from CLKI, 0x02 = CLK from XTALI */
 	{ STB0899_FILTCTRL      	, 0x00 },
 	{ STB0899_SYSCTRL       	, 0x00 },

The commit for this change in Linux stable tree is 27a330d (patch).

Last modified: 2020/01/11 09:36