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| author | Wei WANG <wei_wang@realsil.com.cn> | 2013-01-23 09:51:06 +0800 |
|---|---|---|
| committer | Samuel Ortiz <sameo@linux.intel.com> | 2013-01-27 01:30:20 +0100 |
| commit | ab4e8f8b7bdfeff0c961fdbbdacb262d68f094c0 (patch) | |
| tree | 543440d2656343141c14e565e795a655378a0f72 /drivers/mfd/rtsx_pcr.c | |
| parent | ef85e736b1052d8c1e56990f0d08b6fce7cdbe41 (diff) | |
| download | linux-rpi-ab4e8f8b7bdfeff0c961fdbbdacb262d68f094c0.tar.gz linux-rpi-ab4e8f8b7bdfeff0c961fdbbdacb262d68f094c0.tar.bz2 linux-rpi-ab4e8f8b7bdfeff0c961fdbbdacb262d68f094c0.zip | |
mfd: rtsx: Add clock divider hook
Add callback function conv_clk_and_div_n to convert between SSC clock
and its divider N.
For rtl8411, the formula to calculate SSC clock divider N is different
with the other card reader models.
Signed-off-by: Wei WANG <wei_wang@realsil.com.cn>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/rtsx_pcr.c')
| -rw-r--r-- | drivers/mfd/rtsx_pcr.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/mfd/rtsx_pcr.c b/drivers/mfd/rtsx_pcr.c index f4e02d089271..910200e10fa0 100644 --- a/drivers/mfd/rtsx_pcr.c +++ b/drivers/mfd/rtsx_pcr.c @@ -630,7 +630,10 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock, if (clk == pcr->cur_clock) return 0; - N = (u8)(clk - 2); + if (pcr->ops->conv_clk_and_div_n) + N = (u8)pcr->ops->conv_clk_and_div_n(clk, CLK_TO_DIV_N); + else + N = (u8)(clk - 2); if ((clk <= 2) || (N > max_N)) return -EINVAL; @@ -641,7 +644,14 @@ int rtsx_pci_switch_clock(struct rtsx_pcr *pcr, unsigned int card_clock, /* Make sure that the SSC clock div_n is equal or greater than min_N */ div = CLK_DIV_1; while ((N < min_N) && (div < max_div)) { - N = (N + 2) * 2 - 2; + if (pcr->ops->conv_clk_and_div_n) { + int dbl_clk = pcr->ops->conv_clk_and_div_n(N, + DIV_N_TO_CLK) * 2; + N = (u8)pcr->ops->conv_clk_and_div_n(dbl_clk, + CLK_TO_DIV_N); + } else { + N = (N + 2) * 2 - 2; + } div++; } dev_dbg(&(pcr->pci->dev), "N = %d, div = %d\n", N, div); |