Re: [v4, PATCH 2/3] net: stmmac: fix csr_clk can't be zero issue

The specific clk_csr value can be zero, and
stmmac_clk is necessary for MDC clock which can be set dynamically.
So, change the condition from plat->clk_csr to plat->stmmac_clk to
fix clk_csr can't be zero issue.

Fixes: cd7201f477b9 ("stmmac: MDC clock dynamically based on the csr clock input")
Signed-off-by: Biao Huang <redacted>
---
  drivers/net/ethernet/stmicro/stmmac/stmmac_main.c  |    6 +++---
  .../net/ethernet/stmicro/stmmac/stmmac_platform.c  |    5 ++++-
  2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 06487a6..b2feb6c 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c

@@ -4380,10 +4380,10 @@ int stmmac_dvr_probe(struct device *device,
  	 * set the MDC clock dynamically according to the csr actual
  	 * clock input.
  	 */
-	if (!priv->plat->clk_csr)
-		stmmac_clk_csr_set(priv);
-	else
+	if (priv->plat->clk_csr >= 0)
  		priv->clk_csr = priv->plat->clk_csr;
+	else
+		stmmac_clk_csr_set(priv);
  
  	stmmac_check_pcs_mode(priv);
  

diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
index 3031f2b..f45bfbe 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c

@@ -408,7 +408,10 @@ struct plat_stmmacenet_data *
  	/* Default to phy auto-detection */
  	plat->phy_addr = -1;
  
-	/* Get clk_csr from device tree */
+	/* Default to get clk_csr from stmmac_clk_crs_set(),
+	 * or get clk_csr from device tree.
+	 */
+	plat->clk_csr = -1;
  	of_property_read_u32(np, "clk_csr", &plat->clk_csr);
  
  	/* "snps,phy-addr" is not a standard property. Mark it as deprecated