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| author | Manu Abraham <manu@linuxtv.org> | 2009-04-09 03:14:00 +0400 |
|---|---|---|
| committer | Manu Abraham <manu@linuxtv.org> | 2009-04-09 03:14:00 +0400 |
| commit | f0275699c613cb8cbe3aebf02b8db03c68ba28f1 (patch) | |
| tree | 867ed385031f6fb2e0626b4a8da06fd469009a6e /linux/drivers/media/dvb/frontends | |
| parent | 5fa5b751c79a00c20a2717b642094fab5945c1b3 (diff) | |
| download | mediapointer-dvb-s2-f0275699c613cb8cbe3aebf02b8db03c68ba28f1.tar.gz mediapointer-dvb-s2-f0275699c613cb8cbe3aebf02b8db03c68ba28f1.tar.bz2 | |
Support > 60MSPS, simplify Srate calculation
From: Manu Abraham <abraham.manu@gmail.com>
Signed-off-by: Manu Abraham <manu@linuxtv.org>
Diffstat (limited to 'linux/drivers/media/dvb/frontends')
| -rw-r--r-- | linux/drivers/media/dvb/frontends/stv090x.c | 60 |
1 files changed, 40 insertions, 20 deletions
diff --git a/linux/drivers/media/dvb/frontends/stv090x.c b/linux/drivers/media/dvb/frontends/stv090x.c index 219b10d0c..3a98731f0 100644 --- a/linux/drivers/media/dvb/frontends/stv090x.c +++ b/linux/drivers/media/dvb/frontends/stv090x.c @@ -1510,18 +1510,22 @@ 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"); @@ -1533,17 +1537,29 @@ 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"); @@ -1555,13 +1571,17 @@ 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 */ |