[v2,2/4] pci: dwc: pci-dra7xx: Enable errata i870 for both EP and RC mode

Message ID 20180627122919.23926-3-vigneshr@ti.com
State New
Delegated to: Lorenzo Pieralisi
Headers show
Series
  • pci-dra7xx: Enable errata i870 workaround for RC mode
Related show

Commit Message

Vignesh R June 27, 2018, 12:29 p.m.
Errata i870 is applicable in both EP and RC mode. Therefore rename
function dra7xx_pcie_ep_unaligned_memaccess(), that implements errata
workaround, to dra7xx_pcie_unaligned_memaccess() and call it from a
common place. So, that errata workaround is applied for both modes of
operation.

Reported-by: Chris Welch <Chris.Welch@viavisolutions.com>
Signed-off-by: Vignesh R <vigneshr@ti.com>
---
 drivers/pci/controller/dwc/pci-dra7xx.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

Comments

Kishon Vijay Abraham I July 17, 2018, 9:54 a.m. | #1
On Wednesday 27 June 2018 05:59 PM, Vignesh R wrote:
> Errata i870 is applicable in both EP and RC mode. Therefore rename
> function dra7xx_pcie_ep_unaligned_memaccess(), that implements errata
> workaround, to dra7xx_pcie_unaligned_memaccess() and call it from a
> common place. So, that errata workaround is applied for both modes of
> operation.
> 
> Reported-by: Chris Welch <Chris.Welch@viavisolutions.com>
> Signed-off-by: Vignesh R <vigneshr@ti.com>

Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
> ---
>  drivers/pci/controller/dwc/pci-dra7xx.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
> index 345aab56ce8b..95d9076e3fde 100644
> --- a/drivers/pci/controller/dwc/pci-dra7xx.c
> +++ b/drivers/pci/controller/dwc/pci-dra7xx.c
> @@ -542,7 +542,7 @@ static const struct of_device_id of_dra7xx_pcie_match[] = {
>  };
>  
>  /*
> - * dra7xx_pcie_ep_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
> + * dra7xx_pcie_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
>   * @dra7xx: the dra7xx device where the workaround should be applied
>   *
>   * Access to the PCIe slave port that are not 32-bit aligned will result
> @@ -552,7 +552,7 @@ static const struct of_device_id of_dra7xx_pcie_match[] = {
>   *
>   * To avoid this issue set PCIE_SS1_AXI2OCP_LEGACY_MODE_ENABLE to 1.
>   */
> -static int dra7xx_pcie_ep_unaligned_memaccess(struct device *dev)
> +static int dra7xx_pcie_unaligned_memaccess(struct device *dev)
>  {
>  	int ret;
>  	struct device_node *np = dev->of_node;
> @@ -695,6 +695,10 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
>  	if (dra7xx->link_gen < 0 || dra7xx->link_gen > 2)
>  		dra7xx->link_gen = 2;
>  
> +	ret = dra7xx_pcie_unaligned_memaccess(dev);
> +	if (ret)
> +		dev_err(dev, "WA for Errata i870 not appplied. Update DT\n");
> +
>  	switch (mode) {
>  	case DW_PCIE_RC_TYPE:
>  		if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) {
> @@ -717,10 +721,6 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev)
>  		dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
>  				   DEVICE_TYPE_EP);
>  
> -		ret = dra7xx_pcie_ep_unaligned_memaccess(dev);
> -		if (ret)
> -			goto err_gpio;
> -
>  		ret = dra7xx_add_pcie_ep(dra7xx, pdev);
>  		if (ret < 0)
>  			goto err_gpio;
>

Patch

diff --git a/drivers/pci/controller/dwc/pci-dra7xx.c b/drivers/pci/controller/dwc/pci-dra7xx.c
index 345aab56ce8b..95d9076e3fde 100644
--- a/drivers/pci/controller/dwc/pci-dra7xx.c
+++ b/drivers/pci/controller/dwc/pci-dra7xx.c
@@ -542,7 +542,7 @@  static const struct of_device_id of_dra7xx_pcie_match[] = {
 };
 
 /*
- * dra7xx_pcie_ep_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
+ * dra7xx_pcie_unaligned_memaccess: workaround for AM572x/AM571x Errata i870
  * @dra7xx: the dra7xx device where the workaround should be applied
  *
  * Access to the PCIe slave port that are not 32-bit aligned will result
@@ -552,7 +552,7 @@  static const struct of_device_id of_dra7xx_pcie_match[] = {
  *
  * To avoid this issue set PCIE_SS1_AXI2OCP_LEGACY_MODE_ENABLE to 1.
  */
-static int dra7xx_pcie_ep_unaligned_memaccess(struct device *dev)
+static int dra7xx_pcie_unaligned_memaccess(struct device *dev)
 {
 	int ret;
 	struct device_node *np = dev->of_node;
@@ -695,6 +695,10 @@  static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 	if (dra7xx->link_gen < 0 || dra7xx->link_gen > 2)
 		dra7xx->link_gen = 2;
 
+	ret = dra7xx_pcie_unaligned_memaccess(dev);
+	if (ret)
+		dev_err(dev, "WA for Errata i870 not appplied. Update DT\n");
+
 	switch (mode) {
 	case DW_PCIE_RC_TYPE:
 		if (!IS_ENABLED(CONFIG_PCI_DRA7XX_HOST)) {
@@ -717,10 +721,6 @@  static int __init dra7xx_pcie_probe(struct platform_device *pdev)
 		dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE,
 				   DEVICE_TYPE_EP);
 
-		ret = dra7xx_pcie_ep_unaligned_memaccess(dev);
-		if (ret)
-			goto err_gpio;
-
 		ret = dra7xx_add_pcie_ep(dra7xx, pdev);
 		if (ret < 0)
 			goto err_gpio;