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| author | Joao Pinto <Joao.Pinto@synopsys.com> | 2016-03-10 14:44:35 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2016-03-15 08:50:45 -0500 |
| commit | 886bc5ceb5cc3ad4b219502d72b277e3c3255a32 (patch) | |
| tree | 2648e30863433834dd7df7411f677f1a8c7888f1 /drivers/pci/host/pci-dra7xx.c | |
| parent | c1678ffcdea25afe4fbbebfab13d65a7db5458fb (diff) | |
| download | blackbird-op-linux-886bc5ceb5cc3ad4b219502d72b277e3c3255a32.tar.gz blackbird-op-linux-886bc5ceb5cc3ad4b219502d72b277e3c3255a32.zip | |
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>
Diffstat (limited to 'drivers/pci/host/pci-dra7xx.c')
| -rw-r--r-- | drivers/pci/host/pci-dra7xx.c | 11 |
1 files changed, 1 insertions, 10 deletions
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c index 923607bdabc5..2ca3a1f30ebf 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 @@ static int dra7xx_pcie_establish_link(struct pcie_port *pp) { 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 @@ static int dra7xx_pcie_establish_link(struct pcie_port *pp) 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) |
