diff options
| author | Jay Agarwal <jagarwal@nvidia.com> | 2012-08-16 18:08:12 +0530 |
|---|---|---|
| committer | Simone Willett <swillett@nvidia.com> | 2012-08-27 17:30:39 -0700 |
| commit | 812e6d344d35d7ef6df9ccbeed5f6a65c53e7977 (patch) | |
| tree | c457dd2721a4223ad988d962b5ee0fcf96ed6c24 /arch | |
| parent | ce8ef677d55d74149d75a0ccf8e3b493bf68e110 (diff) | |
arm: tegra: pcie: WAR to avoid hang on PCIe device
Setting DFPCI_RSPPASSPW bit in AFI_CONFIGURATION
register to avoid instant hang on CPU read/write
while gpu transfers are in progress.
Bug 1034443
Change-Id: I40c99588753b8b2cb2d418b54c6ac73f7b8ddc13
Signed-off-by: Jay Agarwal <jagarwal@nvidia.com>
Reviewed-on: http://git-master/r/124037
Reviewed-by: Simone Willett <swillett@nvidia.com>
Tested-by: Simone Willett <swillett@nvidia.com>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/arm/mach-tegra/pcie.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/arm/mach-tegra/pcie.c b/arch/arm/mach-tegra/pcie.c index eef215b00018..04d3a5db3f7e 100644 --- a/arch/arm/mach-tegra/pcie.c +++ b/arch/arm/mach-tegra/pcie.c @@ -105,6 +105,7 @@ #define AFI_CONFIGURATION 0xac #define AFI_CONFIGURATION_EN_FPCI (1 << 0) +#define AFI_CONFIGURATION_DFPCI_RSPPASSPW (1 << 2) #define AFI_FPCI_ERROR_MASKS 0xb0 @@ -876,8 +877,11 @@ static void tegra_pcie_enable_controller(void) /* Take the PCIe interface module out of reset */ tegra_periph_reset_deassert(tegra_pcie.pcie_xclk); + /* WAR avoid hang on CPU read/write while gpu transfers in progress */ + val = afi_readl(AFI_CONFIGURATION) | AFI_CONFIGURATION_DFPCI_RSPPASSPW; + /* Finally enable PCIe */ - val = afi_readl(AFI_CONFIGURATION) | AFI_CONFIGURATION_EN_FPCI; + val |= AFI_CONFIGURATION_EN_FPCI; afi_writel(val, AFI_CONFIGURATION); val = (AFI_INTR_EN_INI_SLVERR | AFI_INTR_EN_INI_DECERR | |