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net: stmmac: dwmac-qcom-ethqos: Use max frequency for clk_ptp_ref

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Qualcomm clocks can set their frequency to a variety of levels
generally. Let's use the max for clk_ptp_ref to ensure the best
timestamping resolution possible.

Without this, the default value of the clock is used. For sa8775p-ride
this is 19.2 MHz, far less than the 230.4 MHz possible.

Reviewed-by: Simon Horman <simon.horman@corigine.com>
Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
Link: https://lore.kernel.org/r/20230725211853.895832-4-ahalaney@redhat.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Andrew Halaney 2023-07-25 16:04:26 -05:00 committed by Jakub Kicinski
parent d928d14be6
commit db845b9b20
1 changed files with 18 additions and 0 deletions
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18
drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
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@ -694,6 +694,23 @@ static void ethqos_clks_disable(void *data)
ethqos_clks_config(data, false);
}
static void ethqos_ptp_clk_freq_config(struct stmmac_priv *priv)
{
struct plat_stmmacenet_data *plat_dat = priv->plat;
int err;
if (!plat_dat->clk_ptp_ref)
return;
/* Max the PTP ref clock out to get the best resolution possible */
err = clk_set_rate(plat_dat->clk_ptp_ref, ULONG_MAX);
if (err)
netdev_err(priv->dev, "Failed to max out clk_ptp_ref: %d\n", err);
plat_dat->clk_ptp_rate = clk_get_rate(plat_dat->clk_ptp_ref);
netdev_dbg(priv->dev, "PTP rate %d\n", plat_dat->clk_ptp_rate);
}
static int qcom_ethqos_probe(struct platform_device *pdev)
{
struct device_node *np = pdev->dev.of_node;
@ -779,6 +796,7 @@ static int qcom_ethqos_probe(struct platform_device *pdev)
plat_dat->bsp_priv = ethqos;
plat_dat->fix_mac_speed = ethqos_fix_mac_speed;
plat_dat->dump_debug_regs = rgmii_dump;
plat_dat->ptp_clk_freq_config = ethqos_ptp_clk_freq_config;
plat_dat->has_gmac4 = 1;
if (ethqos->has_emac_ge_3)
plat_dat->dwmac4_addrs = &data->dwmac4_addrs;