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authorFaiz Abbas <faiz_abbas@ti.com>2021-03-30 14:01:34 +0300
committerVinod Koul <vkoul@kernel.org>2021-03-31 14:15:47 +0300
commit725c7b8d300f8f26163435628b41a4c0a014dd24 (patch)
treec13a1cf4d8e781cbb828ee34c46b014b1d42d806 /drivers/phy/ti
parent1436ec309e6251b372b757bfacf88f5954b8f3fd (diff)
downloadlinux-725c7b8d300f8f26163435628b41a4c0a014dd24.tar.xz
phy: ti: j721e-wiz: Do not configure wiz if its already configured
Serdes lanes might be shared between multiple cores in some usecases and its not possible to lock PLLs for both the lanes independently by the two cores. This requires a bootloader to configure both the lanes at early boot time. To handle this case, skip all configuration if any of the lanes has already been enabled. Signed-off-by: Faiz Abbas <faiz_abbas@ti.com> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com> Link: https://lore.kernel.org/r/20210330110138.24356-2-kishon@ti.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/phy/ti')
-rw-r--r--drivers/phy/ti/phy-j721e-wiz.c21
1 files changed, 16 insertions, 5 deletions
diff --git a/drivers/phy/ti/phy-j721e-wiz.c b/drivers/phy/ti/phy-j721e-wiz.c
index 02c47b2df01f..25238051680d 100644
--- a/drivers/phy/ti/phy-j721e-wiz.c
+++ b/drivers/phy/ti/phy-j721e-wiz.c
@@ -1134,13 +1134,14 @@ static int wiz_probe(struct platform_device *pdev)
struct device *dev = &pdev->dev;
struct device_node *node = dev->of_node;
struct platform_device *serdes_pdev;
+ bool already_configured = false;
struct device_node *child_node;
struct regmap *regmap;
struct resource res;
void __iomem *base;
struct wiz *wiz;
+ int ret, val, i;
u32 num_lanes;
- int ret;
wiz = devm_kzalloc(dev, sizeof(*wiz), GFP_KERNEL);
if (!wiz)
@@ -1268,10 +1269,20 @@ static int wiz_probe(struct platform_device *pdev)
goto err_get_sync;
}
- ret = wiz_init(wiz);
- if (ret) {
- dev_err(dev, "WIZ initialization failed\n");
- goto err_wiz_init;
+ for (i = 0; i < wiz->num_lanes; i++) {
+ regmap_field_read(wiz->p_enable[i], &val);
+ if (val & (P_ENABLE | P_ENABLE_FORCE)) {
+ already_configured = true;
+ break;
+ }
+ }
+
+ if (!already_configured) {
+ ret = wiz_init(wiz);
+ if (ret) {
+ dev_err(dev, "WIZ initialization failed\n");
+ goto err_wiz_init;
+ }
}
serdes_pdev = of_platform_device_create(child_node, NULL, dev);