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Date: Mon, 8 Feb 2016 12:43:58 +0000
From: Joao Pinto <Joao.Pinto@...opsys.com>
To: helgaas@...nel.org
Cc: arnd@...db.de, linux-pci@...r.kernel.org,
linux-kernel@...r.kernel.org, CARLOS.PALMINHA@...opsys.com,
Joao Pinto <Joao.Pinto@...opsys.com>
Subject: [PATCH] link up validation moved to pcie-designware
This patch goal is to centralize in pcie-designware the link up
validation. A new function was added to pci-designware that is
responsible for doing such a task. This was implemented in a form that
permits flexibility for all SoCs.
Signed-off-by: Joao Pinto <jpinto@...opsys.com>
---
drivers/pci/host/pci-dra7xx.c | 11 +++--------
drivers/pci/host/pci-exynos.c | 11 ++---------
drivers/pci/host/pci-imx6.c | 11 +++--------
drivers/pci/host/pcie-designware.c | 20 ++++++++++++++++++++
drivers/pci/host/pcie-designware.h | 2 ++
drivers/pci/host/pcie-spear13xx.c | 12 ++----------
6 files changed, 32 insertions(+), 35 deletions(-)
diff --git a/drivers/pci/host/pci-dra7xx.c b/drivers/pci/host/pci-dra7xx.c
index 8c36880..e425944 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");
@@ -119,13 +117,10 @@ 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);
- }
+ /* check if the link is up or not */
+ if (!dw_pcie_check_link_is_up(pp, 1000, 10, 20))
+ return 0;
- dev_err(pp->dev, "link is not up\n");
return -EINVAL;
}
diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c
index 01095e1..770c45a 100644
--- a/drivers/pci/host/pci-exynos.c
+++ b/drivers/pci/host/pci-exynos.c
@@ -318,7 +318,6 @@ static int exynos_pcie_establish_link(struct pcie_port *pp)
{
struct exynos_pcie *exynos_pcie = to_exynos_pcie(pp);
u32 val;
- unsigned int retries;
if (dw_pcie_link_up(pp)) {
dev_err(pp->dev, "Link already up\n");
@@ -357,13 +356,8 @@ static int exynos_pcie_establish_link(struct pcie_port *pp)
PCIE_APP_LTSSM_ENABLE);
/* check if the link is up or not */
- for (retries = 0; retries < 10; retries++) {
- if (dw_pcie_link_up(pp)) {
- dev_info(pp->dev, "Link up\n");
- return 0;
- }
- mdelay(100);
- }
+ if (!dw_pcie_check_link_is_up(pp, 10, 100000, 110000))
+ return 0;
while (exynos_phy_readl(exynos_pcie, PCIE_PHY_PLL_LOCKED) == 0) {
val = exynos_blk_readl(exynos_pcie, PCIE_PHY_PLL_LOCKED);
@@ -372,7 +366,6 @@ static int exynos_pcie_establish_link(struct pcie_port *pp)
/* power off phy */
exynos_pcie_power_off_phy(pp);
- dev_err(pp->dev, "PCIe Link Fail\n");
return -EINVAL;
}
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index 22e8224..9e323be 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -330,15 +330,10 @@ static void imx6_pcie_init_phy(struct pcie_port *pp)
static int imx6_pcie_wait_for_link(struct pcie_port *pp)
{
- unsigned int retries;
-
- for (retries = 0; retries < 200; retries++) {
- if (dw_pcie_link_up(pp))
- return 0;
- usleep_range(100, 1000);
- }
+ /* check if the link is up or not */
+ if (!dw_pcie_check_link_is_up(pp, 200, 100, 1000))
+ return 0;
- dev_err(pp->dev, "phy link never came up\n");
dev_dbg(pp->dev, "DEBUG_R0: 0x%08x, DEBUG_R1: 0x%08x\n",
readl(pp->dbi_base + PCIE_PHY_DEBUG_R0),
readl(pp->dbi_base + PCIE_PHY_DEBUG_R1));
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index 540f077..6725231 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -22,6 +22,7 @@
#include <linux/pci_regs.h>
#include <linux/platform_device.h>
#include <linux/types.h>
+#include <linux/delay.h>
#include "pcie-designware.h"
@@ -380,6 +381,25 @@ static struct msi_controller dw_pcie_msi_chip = {
.teardown_irq = dw_msi_teardown_irq,
};
+int dw_pcie_check_link_is_up(struct pcie_port *pp, int max_ret, int sleep_min,
+ int sleep_max)
+{
+ int retries;
+
+ /* check if the link is up or not */
+ for (retries = 0; retries < max_ret; retries++) {
+ if (dw_pcie_link_up(pp)) {
+ dev_info(pp->dev, "link up\n");
+ return 0;
+ }
+ usleep_range(sleep_min, sleep_max);
+ }
+
+ dev_err(pp->dev, "phy link never came up\n");
+
+ return 1;
+}
+
int dw_pcie_link_up(struct pcie_port *pp)
{
if (pp->ops->link_up)
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 2356d29..b077fe0 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -76,6 +76,8 @@ int dw_pcie_cfg_read(void __iomem *addr, int size, u32 *val);
int dw_pcie_cfg_write(void __iomem *addr, int size, u32 val);
irqreturn_t dw_handle_msi_irq(struct pcie_port *pp);
void dw_pcie_msi_init(struct pcie_port *pp);
+int dw_pcie_check_link_is_up(struct pcie_port *pp, int max_ret, int sleep_min,
+ int sleep_max);
int dw_pcie_link_up(struct pcie_port *pp);
void dw_pcie_setup_rc(struct pcie_port *pp);
int dw_pcie_host_init(struct pcie_port *pp);
diff --git a/drivers/pci/host/pcie-spear13xx.c b/drivers/pci/host/pcie-spear13xx.c
index b95b756..5c24595 100644
--- a/drivers/pci/host/pcie-spear13xx.c
+++ b/drivers/pci/host/pcie-spear13xx.c
@@ -13,7 +13,6 @@
*/
#include <linux/clk.h>
-#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
@@ -149,7 +148,6 @@ static int spear13xx_pcie_establish_link(struct pcie_port *pp)
struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pp);
struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;
u32 exp_cap_off = EXP_CAP_ID_OFFSET;
- unsigned int retries;
if (dw_pcie_link_up(pp)) {
dev_err(pp->dev, "link already up\n");
@@ -201,15 +199,9 @@ static int spear13xx_pcie_establish_link(struct pcie_port *pp)
&app_reg->app_ctrl_0);
/* check if the link is up or not */
- for (retries = 0; retries < 10; retries++) {
- if (dw_pcie_link_up(pp)) {
- dev_info(pp->dev, "link up\n");
- return 0;
- }
- mdelay(100);
- }
+ if (!dw_pcie_check_link_is_up(pp, 10, 100000, 110000))
+ return 0;
- dev_err(pp->dev, "link Fail\n");
return -EINVAL;
}
--
1.8.1.5
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