Linux Kernels

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

This change “V4L/DVB (9442): Revert back previous change to 90MHz” (commit f2e52cd) 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 f2e52cd

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

 drivers/media/dvb/ttpci/budget-av.c | 2 +-
 drivers/media/dvb/ttpci/budget-ci.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)
 
diff --git a/drivers/media/dvb/ttpci/budget-av.c b/drivers/media/dvb/ttpci/budget-av.c
index ed9b06b4b30e..f996cef79ec1 100644
--- a/drivers/media/dvb/ttpci/budget-av.c
+++ b/drivers/media/dvb/ttpci/budget-av.c
@@ -965,7 +965,7 @@ 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 2a1b79d67b6d..3507463fdac9 100644
--- a/drivers/media/dvb/ttpci/budget-ci.c
+++ b/drivers/media/dvb/ttpci/budget-ci.c
@@ -1154,7 +1154,7 @@ 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 f2e52cd (patch).

Last modified: 2020/01/11 06:56