From d6e549d319a53b30a6562721eb7cd05a7593341f Mon Sep 17 00:00:00 2001
From: Biao Huang <biao.huang@mediatek.com>
Date: Fri, 24 May 2019 14:26:08 +0800
Subject: [PATCH 7/8] net: stmmac: fix csr_clk can't be zero issue
Git-commit: 5e7f7fc538d894b2d9aa41876b8dcf35f5fe11e6
Patch-mainline: v5.2-rc3
References: git-fixes
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 <biao.huang@mediatek.com>
Acked-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Acked-by: Denis Kirjanov <denis.kirjanov@suse.com>
---
drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 6 +++---
drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c | 6 ++++++
2 files changed, 9 insertions(+), 3 deletions(-)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 1ac4cd1fbd0d..428222f3b480 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4277,10 +4277,10 @@ 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 7fc3a1ef395a..9aa60d85fe65 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_platform.c
@@ -385,6 +385,12 @@ stmmac_probe_config_dt(struct platform_device *pdev, const char **mac)
/* Default to phy auto-detection */
plat->phy_addr = -1;
+ /* 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
* and warn of its use. Remove this when phy node support is added.
*/
--
2.16.4