linux-kernel - [PATCH 3/5] PCI: mt7621: avoid custom MIPS code in driver code

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Message-Id: <20211115070809.15529-4-sergio.paracuellos@gmail.com>
Date:   Mon, 15 Nov 2021 08:08:07 +0100
From:   Sergio Paracuellos <sergio.paracuellos@...il.com>
To:     linux-pci@...r.kernel.org
Cc:     linux-mips@...r.kernel.org, tsbogend@...ha.franken.de,
        john@...ozen.org, lorenzo.pieralisi@....com, bhelgaas@...gle.com,
        arnd@...db.de, linux-kernel@...r.kernel.org,
        kernel test robot <lkp@...el.com>
Subject: [PATCH 3/5] PCI: mt7621: avoid custom MIPS code in driver code

Driver code is setting up MIPS specific I/O coherency units addresses config.
This MIPS specific thing has been moved to be done when PCI code call the
'pcibios_root_bridge_prepare()' function which has been implemented for MIPS
ralink mt7621 platform. Hence, remove MIPS specific code from driver code.
After this changes there is also no need to add any MIPS specific includes
to avoid some errors reported by Kernet Tets Robot with W=1 builds.

Reported-by: kernel test robot <lkp@...el.com>
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@...il.com>
---
 drivers/pci/controller/pcie-mt7621.c | 37 ----------------------------
 1 file changed, 37 deletions(-)

diff --git a/drivers/pci/controller/pcie-mt7621.c b/drivers/pci/controller/pcie-mt7621.c
index b60dfb45ef7b..9cf541f5de9c 100644
--- a/drivers/pci/controller/pcie-mt7621.c
+++ b/drivers/pci/controller/pcie-mt7621.c
@@ -208,37 +208,6 @@ static inline void mt7621_control_deassert(struct mt7621_pcie_port *port)
 		reset_control_assert(port->pcie_rst);
 }
 
-static int setup_cm_memory_region(struct pci_host_bridge *host)
-{
-	struct mt7621_pcie *pcie = pci_host_bridge_priv(host);
-	struct device *dev = pcie->dev;
-	struct resource_entry *entry;
-	resource_size_t mask;
-
-	entry = resource_list_first_type(&host->windows, IORESOURCE_MEM);
-	if (!entry) {
-		dev_err(dev, "cannot get memory resource\n");
-		return -EINVAL;
-	}
-
-	if (mips_cps_numiocu(0)) {
-		/*
-		 * FIXME: hardware doesn't accept mask values with 1s after
-		 * 0s (e.g. 0xffef), so it would be great to warn if that's
-		 * about to happen
-		 */
-		mask = ~(entry->res->end - entry->res->start);
-
-		write_gcr_reg1_base(entry->res->start);
-		write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
-		dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
-			 (unsigned long long)read_gcr_reg1_base(),
-			 (unsigned long long)read_gcr_reg1_mask());
-	}
-
-	return 0;
-}
-
 static int mt7621_pcie_parse_port(struct mt7621_pcie *pcie,
 				  struct device_node *node,
 				  int slot)
@@ -557,12 +526,6 @@ static int mt7621_pci_probe(struct platform_device *pdev)
 		goto remove_resets;
 	}
 
-	err = setup_cm_memory_region(bridge);
-	if (err) {
-		dev_err(dev, "error setting up iocu mem regions\n");
-		goto remove_resets;
-	}
-
 	return mt7621_pcie_register_host(bridge);
 
 remove_resets:
-- 
2.33.0