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authorManu Abraham <abraham.manu@gmail.com>2009-04-08 20:14:00 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-06-16 18:20:39 -0300
commit15bb366e86e07820374ec313170aab65d4e1d983 (patch)
tree0e045378faddba2fbc807b345b0dbf128025d480 /drivers/media/dvb/frontends
parent94a809143a47343b45c73e84f7f26e3087c2fd62 (diff)
V4L/DVB (11588): stv090x: support > 60MSPS, simplify Srate calculation
Signed-off-by: Manu Abraham <manu@linuxtv.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/dvb/frontends')
-rw-r--r--drivers/media/dvb/frontends/stv090x.c60
1 files changed, 40 insertions, 20 deletions
diff --git a/drivers/media/dvb/frontends/stv090x.c b/drivers/media/dvb/frontends/stv090x.c
index a350364a42f..6e7c47a1f67 100644
--- a/drivers/media/dvb/frontends/stv090x.c
+++ b/drivers/media/dvb/frontends/stv090x.c
@@ -725,18 +725,22 @@ static int stv090x_set_srate(struct stv090x_state *state, u32 srate)
{
u32 sym;
- if (srate > 6000000) {
- sym = (srate / 1000) * 65536;
- sym /= (state->mclk / 1000);
+ if (srate > 60000000) {
+ sym = (srate << 4); /* SR * 2^16 / master_clk */
+ sym /= (state->mclk >> 12);
+ } else if (srate > 6000000) {
+ sym = (srate << 6);
+ sym /= (state->mclk >> 10);
} else {
- sym = (srate / 100) * 65536;
- sym /= (state->mclk / 100);
+ sym = (srate << 9);
+ sym /= (state->mclk >> 7);
}
- if (STV090x_WRITE_DEMOD(state, SFRINIT1, (sym >> 8) & 0xff) < 0) /* MSB */
+ if (STV090x_WRITE_DEMOD(state, SFRINIT1, (sym >> 8) & 0x7f) < 0) /* MSB */
goto err;
if (STV090x_WRITE_DEMOD(state, SFRINIT0, (sym & 0xff)) < 0) /* LSB */
goto err;
+
return 0;
err:
dprintk(FE_ERROR, 1, "I/O error");
@@ -748,17 +752,29 @@ static int stv090x_set_max_srate(struct stv090x_state *state, u32 clk, u32 srate
u32 sym;
srate = 105 * (srate / 100);
- if (srate > 6000000) {
- sym = (srate / 1000) * 65536;
- sym /= (clk / 1000);
+ if (srate > 60000000) {
+ sym = (srate << 4); /* SR * 2^16 / master_clk */
+ sym /= (state->mclk >> 12);
+ } else if (srate > 6000000) {
+ sym = (srate << 6);
+ sym /= (state->mclk >> 10);
} else {
- sym = (srate / 100) * 65536;
- sym /= (clk / 100);
+ sym = (srate << 9);
+ sym /= (state->mclk >> 7);
}
- if (STV090x_WRITE_DEMOD(state, SFRUP1, (sym >> 8) & 0x7f) < 0) /* MSB */
- goto err;
- if (STV090x_WRITE_DEMOD(state, SFRUP0, sym & 0xff) < 0) /* LSB */
- goto err;
+
+ if (sym < 0x7fff) {
+ if (STV090x_WRITE_DEMOD(state, SFRUP1, (sym >> 8) & 0x7f) < 0) /* MSB */
+ goto err;
+ if (STV090x_WRITE_DEMOD(state, SFRUP0, sym & 0xff) < 0) /* LSB */
+ goto err;
+ } else {
+ if (STV090x_WRITE_DEMOD(state, SFRUP1, 0x7f) < 0) /* MSB */
+ goto err;
+ if (STV090x_WRITE_DEMOD(state, SFRUP0, 0xff) < 0) /* LSB */
+ goto err;
+ }
+
return 0;
err:
dprintk(FE_ERROR, 1, "I/O error");
@@ -770,13 +786,17 @@ static int stv090x_set_min_srate(struct stv090x_state *state, u32 clk, u32 srate
u32 sym;
srate = 95 * (srate / 100);
- if (srate > 6000000) {
- sym = (srate / 1000) * 65536;
- sym /= (clk / 1000);
+ if (srate > 60000000) {
+ sym = (srate << 4); /* SR * 2^16 / master_clk */
+ sym /= (state->mclk >> 12);
+ } else if (srate > 6000000) {
+ sym = (srate << 6);
+ sym /= (state->mclk >> 10);
} else {
- sym = (srate / 100) * 65536;
- sym /= (clk / 100);
+ sym = (srate << 9);
+ sym /= (state->mclk >> 7);
}
+
if (STV090x_WRITE_DEMOD(state, SFRLOW1, ((sym >> 8) & 0xff)) < 0) /* MSB */
goto err;
if (STV090x_WRITE_DEMOD(state, SFRLOW0, (sym & 0xff)) < 0) /* LSB */