PCI: designware: Add generic dw_pcie_wait_for_link()
Several DesignWare-based drivers (dra7xx, exynos, imx6, keystone, qcom, and
spear13xx) had similar loops waiting for the link to come up.
Add a generic dw_pcie_wait_for_link() for use by all these drivers so the
waiting is done consistently, e.g., always using usleep_range() rather than
mdelay() and using similar timeouts and retry counts.
Note that this changes the Keystone link training/wait for link strategy,
so we initiate link training, then wait longer for the link to come up
before re-initiating link training.
[bhelgaas: changelog, split into its own patch, update pci-keystone.c, pcie-qcom.c]
Signed-off-by: Joao Pinto <jpinto@synopsys.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Pratyush Anand <pratyush.anand@gmail.com>
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index 923607b..2ca3a1f 100644
--- a/drivers/pci/host/pci-dra7xx.c
+++ b/drivers/pci/host/pci-dra7xx.c
@@ -10,7 +10,6 @@
* published by the Free Software Foundation.
*/
-#include <linux/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
@@ -108,7 +107,6 @@
{
struct dra7xx_pcie *dra7xx = to_dra7xx_pcie(pp);
u32 reg;
- unsigned int retries;
if (dw_pcie_link_up(pp)) {
dev_err(pp->dev, "link is already up\n");
@@ -119,14 +117,7 @@
reg |= LTSSM_EN;
dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_DEVICE_CMD, reg);
- for (retries = 0; retries < 1000; retries++) {
- if (dw_pcie_link_up(pp))
- return 0;
- usleep_range(10, 20);
- }
-
- dev_err(pp->dev, "link is not up\n");
- return -EINVAL;
+ return dw_pcie_wait_for_link(pp);
}
static void dra7xx_pcie_enable_interrupts(struct pcie_port *pp)