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| author | Ingo Molnar <mingo@elte.hu> | 2009-09-02 08:20:32 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-02 08:20:35 +0200 |
| commit | f14eff1cc2f418a7c5e23aedc6a1bdca3343b871 (patch) | |
| tree | fd8d5f7ed2b2e94eff4007e8da0e9ed205d8d5c9 /drivers/spi/spi_s3c24xx.c | |
| parent | 84e9dabf6e6a78928c6a1a8ba235c9fb0908d0f8 (diff) | |
| parent | 326ba5010a5429a5a528b268b36a5900d4ab0eba (diff) | |
| download | lwn-f14eff1cc2f418a7c5e23aedc6a1bdca3343b871.tar.gz lwn-f14eff1cc2f418a7c5e23aedc6a1bdca3343b871.zip | |
Merge commit 'v2.6.31-rc8' into sched/core
Merge reason: bump from rc5 to rc8, but also pick up TP_perf_assign()
API, a patch will be queued that depends on it.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/spi/spi_s3c24xx.c')
| -rw-r--r-- | drivers/spi/spi_s3c24xx.c | 23 |
1 files changed, 13 insertions, 10 deletions
diff --git a/drivers/spi/spi_s3c24xx.c b/drivers/spi/spi_s3c24xx.c index e0d44af4745a..3f3119d760db 100644 --- a/drivers/spi/spi_s3c24xx.c +++ b/drivers/spi/spi_s3c24xx.c @@ -111,29 +111,32 @@ static int s3c24xx_spi_setupxfer(struct spi_device *spi, unsigned int bpw; unsigned int hz; unsigned int div; + unsigned long clk; bpw = t ? t->bits_per_word : spi->bits_per_word; hz = t ? t->speed_hz : spi->max_speed_hz; + if (!bpw) + bpw = 8; + + if (!hz) + hz = spi->max_speed_hz; + if (bpw != 8) { dev_err(&spi->dev, "invalid bits-per-word (%d)\n", bpw); return -EINVAL; } - div = clk_get_rate(hw->clk) / hz; - - /* is clk = pclk / (2 * (pre+1)), or is it - * clk = (pclk * 2) / ( pre + 1) */ - - div /= 2; - - if (div > 0) - div -= 1; + clk = clk_get_rate(hw->clk); + div = DIV_ROUND_UP(clk, hz * 2) - 1; if (div > 255) div = 255; - dev_dbg(&spi->dev, "setting pre-scaler to %d (hz %d)\n", div, hz); + dev_dbg(&spi->dev, "setting pre-scaler to %d (wanted %d, got %ld)\n", + div, hz, clk / (2 * (div + 1))); + + writeb(div, hw->regs + S3C2410_SPPRE); spin_lock(&hw->bitbang.lock); |