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mmc: zynq_sdhci: Fix SDx_BASECLK configuration

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The DLL mode supported SD reference clocks are 50 MHz, 100 MHz and
200 MHz. When user select SD frequency as 200MHz in the design, the
actual frequency is going to come around ~187MHz (<= 200MHz considering
the parent clock and divisor selection). We need to set SDx_BASECLK as
200 in this case, setting 187 will result in tuning failures in mmc.

Set SDx_BASECLK to exact value of 200, 100 or 50 based on the frequency
range.

Signed-off-by: Ashok Reddy Soma <ashok.reddy.soma@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
Link: https://lore.kernel.org/r/6c1e5eeeedd2864a0c85e6b409d182031d8c6c1a.1648210268.git.michal.simek@xilinx.com
This commit is contained in:
Ashok Reddy Soma 2022-03-25 13:11:10 +01:00 committed by Michal Simek
parent cbeba35152
commit 035d56f238
1 changed files with 9 additions and 0 deletions
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9
drivers/mmc/zynq_sdhci.c
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@ -765,6 +765,15 @@ static int sdhci_zynqmp_set_dynamic_config(struct arasan_sdhci_priv *priv,
mhz = DIV64_U64_ROUND_UP(clock, 1000000);
if (mhz > 100 && mhz <= 200)
mhz = 200;
else if (mhz > 50 && mhz <= 100)
mhz = 100;
else if (mhz > 25 && mhz <= 50)
mhz = 50;
else
mhz = 25;
ret = zynqmp_pm_set_sd_config(node_id, SD_CONFIG_BASECLK, mhz);
if (ret) {
dev_err(dev, "SD_CONFIG_BASECLK failed\n");