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net: stmmac: thead: use rgmii_clock() for RGMII clock rate

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Switch to using rgmii_clock() to get the RGMII TXC rate, and calculate
the divisor from the parent clock rate and the rate indicated by
rgmii_clock().

Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Tested-by: Drew Fustini <drew@pdp7.com>
Link: https://patch.msgid.link/E1tlTo8-004W3a-CO@rmk-PC.armlinux.org.uk
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Russell King (Oracle)
2025-02-21 14:15:12 +00:00
committed by Jakub Kicinski
parent f7135a4f6d
commit 171fd7cb15
1 changed files with 5 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
drivers/net/ethernet/stmicro/stmmac/dwmac-thead.c
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@@ -109,6 +109,7 @@ static void thead_dwmac_fix_speed(void *priv, int speed, unsigned int mode)
struct plat_stmmacenet_data *plat;
struct thead_dwmac *dwmac = priv;
unsigned long rate;
long tx_rate;
u32 div, reg;
plat = dwmac->plat;
@@ -131,21 +132,14 @@ static void thead_dwmac_fix_speed(void *priv, int speed, unsigned int mode)
writel(0, dwmac->apb_base + GMAC_PLLCLK_DIV);
switch (speed) {
case SPEED_1000:
div = rate / GMAC_GMII_RGMII_RATE;
break;
case SPEED_100:
div = rate / GMAC_MII_RATE;
break;
case SPEED_10:
div = rate * 10 / GMAC_MII_RATE;
break;
default:
tx_rate = rgmii_clock(speed);
if (tx_rate < 0) {
dev_err(dwmac->dev, "invalid speed %d\n", speed);
return;
}
div = rate / tx_rate;
reg = FIELD_PREP(GMAC_PLLCLK_DIV_EN, 1) |
FIELD_PREP(GMAC_PLLCLK_DIV_NUM, div);
writel(reg, dwmac->apb_base + GMAC_PLLCLK_DIV);