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phy: zynqmp: Allow variation in refclk rate

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Due to limited available frequency ratios, the reference clock rate may
not be exactly the same as the required rate. Allow a small (100 ppm)
deviation.

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
Link: https://lore.kernel.org/r/20230711194542.898230-1-sean.anderson@seco.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Sean Anderson 2023-07-11 15:45:39 -04:00 • committed by Vinod Koul
parent 20b5c6ae18
commit 76009ee76e
1 changed files with 4 additions and 1 deletions
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5
drivers/phy/xilinx/phy-zynqmp.c
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@ -904,7 +904,10 @@ static int xpsgtr_get_ref_clocks(struct xpsgtr_dev *gtr_dev)
rate = clk_get_rate(clk); rate = clk_get_rate(clk);
for (i = 0 ; i < ARRAY_SIZE(ssc_lookup); i++) { for (i = 0 ; i < ARRAY_SIZE(ssc_lookup); i++) {
if (rate == ssc_lookup[i].refclk_rate) { /* Allow an error of 100 ppm */
unsigned long error = ssc_lookup[i].refclk_rate / 10000;
if (abs(rate - ssc_lookup[i].refclk_rate) < error) {
gtr_dev->refclk_sscs[refclk] = &ssc_lookup[i]; gtr_dev->refclk_sscs[refclk] = &ssc_lookup[i];
break; break;
} }