[RFC PATCH 11/11] HACK: pci: controller: dra7xx: disable smart idle
From: Kishon Vijay Abraham I <hidden>
Date: 2016-09-14 05:15:04
Also in:
linux-devicetree, linux-omap, linux-pci, lkml
Subsystem:
pci native host bridge and endpoint drivers, pci subsystem, the rest · Maintainers:
Lorenzo Pieralisi, Krzysztof Wilczyński, Manivannan Sadhasivam, Bjorn Helgaas, Linus Torvalds
Smart idle prevents RC to access the memory space of this controller. Set the idle mode to smart idle wakeup. This should ideally be done in hwmod. Till it's figured out how to configure it in hwmod, mark this as HACK. Signed-off-by: Kishon Vijay Abraham I <redacted> --- drivers/pci/controller/pci-dra7xx.c | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/drivers/pci/controller/pci-dra7xx.c b/drivers/pci/controller/pci-dra7xx.c
index 5b49367..31211e6 100644
--- a/drivers/pci/controller/pci-dra7xx.c
+++ b/drivers/pci/controller/pci-dra7xx.c@@ -30,6 +30,14 @@ /* PCIe controller wrapper DRA7XX configuration registers */ +#define PCIECTRL_DRA7XX_CONF_SYSCONFIG 0x0010 +#define SIDLE_MASK 3 +#define SIDLE_SHIFT 2 +#define SIDLE_FORCE 0x0 +#define SIDLE_NO 0x1 +#define SIDLE_SMART 0x2 +#define SIDLE_SMART_WKUP 0x3 + #define PCIECTRL_DRA7XX_CONF_IRQSTATUS_MAIN 0x0024 #define PCIECTRL_DRA7XX_CONF_IRQENABLE_SET_MAIN 0x0028 #define ERR_SYS BIT(0)
@@ -606,6 +614,10 @@ static int __init dra7xx_pcie_probe(struct platform_device *pdev) goto err_gpio; break; case DW_PCIE_EP_TYPE: + reg = dra7xx_pcie_readl(dra7xx, PCIECTRL_DRA7XX_CONF_SYSCONFIG); + reg &= ~(SIDLE_MASK << SIDLE_SHIFT); + reg |= SIDLE_SMART_WKUP << SIDLE_SHIFT; + dra7xx_pcie_writel(dra7xx, PCIECTRL_DRA7XX_CONF_SYSCONFIG, reg); dra7xx_pcie_writel(dra7xx, PCIECTRL_TI_CONF_DEVICE_TYPE, DEVICE_TYPE_EP); ret = dra7xx_add_pcie_ep(dra7xx, pdev);
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1.7.9.5