Commit db845b9b authored by Andrew Halaney's avatar Andrew Halaney Committed by Jakub Kicinski
Browse files

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



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: default avatarSimon Horman <simon.horman@corigine.com>
Signed-off-by: default avatarAndrew Halaney <ahalaney@redhat.com>
Link: https://lore.kernel.org/r/20230725211853.895832-4-ahalaney@redhat.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent d928d14b

drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c

+18 −0
Original line number Diff line number Diff line
@@ -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;