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authorTony Prisk <linux@prisktech.co.nz>2012-10-18 22:26:53 +1300
committerMike Turquette <mturquette@linaro.org>2012-11-09 17:03:55 -0800
commit973e1d1de0f8af2be7f8c94418f2cda559bd7543 (patch)
tree2e3896527b4dc2f4c3d1d9e14521ba7029d7b6dd /drivers/clk/clk-vt8500.c
parent0de9f23a2859a4aec5db210887c7457e0c24b9ca (diff)
CLK: vt8500: Fix SDMMC clk special cases
This patch adds some additional handling for the SDMMC special case in round_rate and set_rate which results in invalid divisor messages at boot time. Signed-off-by: Tony Prisk <linux@prisktech.co.nz> Signed-off-by: Mike Turquette <mturquette@linaro.org>
Diffstat (limited to 'drivers/clk/clk-vt8500.c')
-rw-r--r--drivers/clk/clk-vt8500.c18
1 files changed, 18 insertions, 0 deletions
diff --git a/drivers/clk/clk-vt8500.c b/drivers/clk/clk-vt8500.c
index a885600f5270..fe25570874d6 100644
--- a/drivers/clk/clk-vt8500.c
+++ b/drivers/clk/clk-vt8500.c
@@ -120,8 +120,17 @@ static unsigned long vt8500_dclk_recalc_rate(struct clk_hw *hw,
static long vt8500_dclk_round_rate(struct clk_hw *hw, unsigned long rate,
unsigned long *prate)
{
+ struct clk_device *cdev = to_clk_device(hw);
u32 divisor = *prate / rate;
+ /*
+ * If this is a request for SDMMC we have to adjust the divisor
+ * when >31 to use the fixed predivisor
+ */
+ if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
+ divisor = 64 * ((divisor / 64) + 1);
+ }
+
return *prate / divisor;
}
@@ -135,6 +144,15 @@ static int vt8500_dclk_set_rate(struct clk_hw *hw, unsigned long rate,
if (divisor == cdev->div_mask + 1)
divisor = 0;
+ /* SDMMC mask may need to be corrected before testing if its valid */
+ if ((cdev->div_mask == 0x3F) && (divisor > 31)) {
+ /*
+ * Bit 5 is a fixed /64 predivisor. If the requested divisor
+ * is >31 then correct for the fixed divisor being required.
+ */
+ divisor = 0x20 + (divisor / 64);
+ }
+
if (divisor > cdev->div_mask) {
pr_err("%s: invalid divisor for clock\n", __func__);
return -EINVAL;