[PATCH v4] PCI: dwc: dra7xx: Fix incorrect usage of IRQSTATUS_* registers

[PATCH v4] PCI: dwc: dra7xx: Fix incorrect usage of IRQSTATUS_* registers

[Arvind Yadav]

'commit 47ff3de911a7 ("PCI: dra7xx: Add TI DRA7xx PCIe driver")' in order to clear
MSI and MAIN interrupts requests wrote '0' to PCIECTRL_TI_CONF_IRQSTATUS_MSI
and PCIECTRL_TI_CONF_IRQSTATUS_MAIN registers. However the TRM has mentioned to
write '1' to clear pending event in these two registers. Fix it here.

This also helps to get rid of the following compilation warning:
drivers/pci/dwc/pci-dra7xx.c: In function ‘dra7xx_pcie_enable_msi_interrupts’:
drivers/pci/dwc/pci-dra7xx.c:177:7: warning: large integer implicitly truncated to unsigned type [-Woverflow]
       ~LEG_EP_INTERRUPTS & ~MSI);
       ^
drivers/pci/dwc/pci-dra7xx.c: In function ‘dra7xx_pcie_enable_wrapper_interrupts’:
drivers/pci/dwc/pci-dra7xx.c:187:7: warning: large integer implicitly truncated to unsigned type [-Woverflow]
       ~INTERRUPTS);

Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>
---
 drivers/pci/dwc/pci-dra7xx.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
index 8decf46..668dc15 100644
--- a/drivers/pci/dwc/pci-dra7xx.c
+++ b/drivers/pci/dwc/pci-dra7xx.c
@@ -174,7 +174,7 @@ static int dra7xx_pcie_establish_link(struct dw_pcie *pci)
 static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
 {
 	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
-			   ~LEG_EP_INTERRUPTS & ~MSI);
+			   LEG_EP_INTERRUPTS | MSI);
 
 	dra7xx_pcie_writel(dra7xx,
 			   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
@@ -184,7 +184,7 @@ static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
 static void dra7xx_pcie_enable_wrapper_interrupts(struct dra7xx_pcie *dra7xx)
 {
 	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
-			   ~INTERRUPTS);
+			   INTERRUPTS);
 	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN,
 			   INTERRUPTS);
 }
-- 
1.9.1

Re: [PATCH v4] PCI: dwc: dra7xx: Fix incorrect usage of IRQSTATUS_* registers

[Bjorn Helgaas]

On Mon, Jun 19, 2017 at 03:21:36PM +0530, Arvind Yadav wrote:
> 'commit 47ff3de911a7 ("PCI: dra7xx: Add TI DRA7xx PCIe driver")' in order to clear
> MSI and MAIN interrupts requests wrote '0' to PCIECTRL_TI_CONF_IRQSTATUS_MSI
> and PCIECTRL_TI_CONF_IRQSTATUS_MAIN registers. However the TRM has mentioned to
> write '1' to clear pending event in these two registers. Fix it here.
> 
> This also helps to get rid of the following compilation warning:
> drivers/pci/dwc/pci-dra7xx.c: In function ‘dra7xx_pcie_enable_msi_interrupts’:
> drivers/pci/dwc/pci-dra7xx.c:177:7: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>        ~LEG_EP_INTERRUPTS & ~MSI);
>        ^
> drivers/pci/dwc/pci-dra7xx.c: In function ‘dra7xx_pcie_enable_wrapper_interrupts’:
> drivers/pci/dwc/pci-dra7xx.c:187:7: warning: large integer implicitly truncated to unsigned type [-Woverflow]
>        ~INTERRUPTS);
> 
> Signed-off-by: Arvind Yadav <arvind.yadav.cs@gmail.com>

Added a Fixes: tag and applied with Kishon's ack (from v3, where the patch
is identical) to pci/host-dra7xx for v4.13, thanks!

> ---
>  drivers/pci/dwc/pci-dra7xx.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/dwc/pci-dra7xx.c b/drivers/pci/dwc/pci-dra7xx.c
> index 8decf46..668dc15 100644
> --- a/drivers/pci/dwc/pci-dra7xx.c
> +++ b/drivers/pci/dwc/pci-dra7xx.c
> @@ -174,7 +174,7 @@ static int dra7xx_pcie_establish_link(struct dw_pcie *pci)
>  static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
>  {
>  	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MSI,
> -			   ~LEG_EP_INTERRUPTS & ~MSI);
> +			   LEG_EP_INTERRUPTS | MSI);
>  
>  	dra7xx_pcie_writel(dra7xx,
>  			   PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MSI,
> @@ -184,7 +184,7 @@ static void dra7xx_pcie_enable_msi_interrupts(struct dra7xx_pcie *dra7xx)
>  static void dra7xx_pcie_enable_wrapper_interrupts(struct dra7xx_pcie *dra7xx)
>  {
>  	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN,
> -			   ~INTERRUPTS);
> +			   INTERRUPTS);
>  	dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN,
>  			   INTERRUPTS);
>  }
> -- 
> 1.9.1
>