diff mbox series

[RFC/RFT,net-next,2/3] net: stmmac: dwmac-qcom-ethqos: Use max frequency for clk_ptp_ref

Message ID 20230711205732.364954-3-ahalaney@redhat.com (mailing list archive)
State RFC
Delegated to: Netdev Maintainers
Headers show
Series net: stmmac: Increase clk_ptp_ref rate | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1341 this patch: 1341
netdev/cc_maintainers warning 1 maintainers not CCed: richardcochran@gmail.com
netdev/build_clang success Errors and warnings before: 1364 this patch: 1364
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1364 this patch: 1364
netdev/checkpatch warning WARNING: line length of 82 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Andrew Halaney July 11, 2023, 8:35 p.m. UTC 
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.

Signed-off-by: Andrew Halaney <ahalaney@redhat.com>
---
 .../stmicro/stmmac/dwmac-qcom-ethqos.c         | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

Comments

Simon Horman July 13, 2023, 9:57 a.m. UTC | #1 
On Tue, Jul 11, 2023 at 03:35:31PM -0500, Andrew Halaney wrote:
> 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.
> 
> Signed-off-by: Andrew Halaney <ahalaney@redhat.com>

Reviewed-by: Simon Horman <simon.horman@corigine.com>
diff mbox series

Patch

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
index 757504ebb676..f9e7440520fa 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
@@ -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;