From 9e53481eea26891011ef7aa28e7990769fb6cf50 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Wed, 7 May 2014 12:20:58 +0100 Subject: [PATCH] MIPS: Malta: Let PIIX4 respond to PCI special cycles This patch enables the PIIX4 to respond to special cycles on the PCI bus. One such special cycle must be used in order to enter a suspend state, and if response to it is not enabled then the suspend state will never be entered. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/6904/ Signed-off-by: Ralf Baechle --- arch/mips/pci/fixup-malta.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/mips/pci/fixup-malta.c b/arch/mips/pci/fixup-malta.c index 2f9e52a1a750..40e920c653cc 100644 --- a/arch/mips/pci/fixup-malta.c +++ b/arch/mips/pci/fixup-malta.c @@ -68,6 +68,7 @@ static void malta_piix_func0_fixup(struct pci_dev *pdev) { unsigned char reg_val; u32 reg_val32; + u16 reg_val16; /* PIIX PIRQC[A:D] irq mappings */ static int piixirqmap[PIIX4_FUNC0_PIRQRC_IRQ_ROUTING_MAX] = { 0, 0, 0, 3, @@ -107,6 +108,11 @@ static void malta_piix_func0_fixup(struct pci_dev *pdev) pci_read_config_byte(pdev, PIIX4_FUNC0_SERIRQC, ®_val); reg_val |= PIIX4_FUNC0_SERIRQC_EN | PIIX4_FUNC0_SERIRQC_CONT; pci_write_config_byte(pdev, PIIX4_FUNC0_SERIRQC, reg_val); + + /* Enable response to special cycles */ + pci_read_config_word(pdev, PCI_COMMAND, ®_val16); + pci_write_config_word(pdev, PCI_COMMAND, + reg_val16 | PCI_COMMAND_SPECIAL); } DECLARE_PCI_FIXUP_HEADER(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_INTEL_82371AB_0, -- 2.20.1