[PATCH] PCI: mt7621: Fix the compile error in cross complication

[weirongguang]

When I was compile the latest kernel in x86 platform and
the build environment like this:

Compiler: gcc
Compiler version: 10
Compiler string: mips-linux-gnu-gcc (Debian 10.2.1-6) 10.2.1 20210110
Cross-compile: mips-linux-gnu-

It make a compile error:

drivers/pci/controller/pcie-mt7621.c: In function 'setup_cm_memory_region':
drivers/pci/controller/pcie-mt7621.c:224:6: error: implicit declaration of function 'mips_cps_numiocu' [-Werror=implicit-function-declaration]
  224 |  if (mips_cps_numiocu(0)) {
      |      ^~~~~~~~~~~~~~~~
drivers/pci/controller/pcie-mt7621.c:232:3: error: implicit declaration of function 'write_gcr_reg1_base'; did you mean 'write_gc0_ebase'? [-Werror=implicit-function-declaration]
  232 |   write_gcr_reg1_base(entry->res->start);
      |   ^~~~~~~~~~~~~~~~~~~
      |   write_gc0_ebase
drivers/pci/controller/pcie-mt7621.c:233:3: error: implicit declaration of function 'write_gcr_reg1_mask'; did you mean 'write_gc0_pagemask'? [-Werror=implicit-function-declaration]
  233 |   write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
      |   ^~~~~~~~~~~~~~~~~~~
      |   write_gc0_pagemask
drivers/pci/controller/pcie-mt7621.c:233:30: error: 'CM_GCR_REGn_MASK_CMTGT_IOCU0' undeclared (first use in this function)
  233 |   write_gcr_reg1_mask(mask | CM_GCR_REGn_MASK_CMTGT_IOCU0);
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/pci/controller/pcie-mt7621.c:233:30: note: each undeclared identifier is reported only once for each function it appears in
In file included from ./include/linux/device.h:15,
                 from ./include/linux/of_platform.h:9,
                 from drivers/pci/controller/pcie-mt7621.c:26:
drivers/pci/controller/pcie-mt7621.c:235:25: error: implicit declaration of function 'read_gcr_reg1_base'; did you mean 'read_gc0_ebase'? [-Werror=implicit-function-declaration]
  235 |     (unsigned long long)read_gcr_reg1_base(),
      |                         ^~~~~~~~~~~~~~~~~~
./include/linux/dev_printk.h:110:23: note: in definition of macro 'dev_printk_index_wrap'
  110 |   _p_func(dev, fmt, ##__VA_ARGS__);   \
      |                       ^~~~~~~~~~~
drivers/pci/controller/pcie-mt7621.c:234:3: note: in expansion of macro 'dev_info'
  234 |   dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
      |   ^~~~~~~~
drivers/pci/controller/pcie-mt7621.c:236:25: error: implicit declaration of function 'read_gcr_reg1_mask'; did you mean 'read_gc0_pagemask'? [-Werror=implicit-function-declaration]
  236 |     (unsigned long long)read_gcr_reg1_mask());
      |                         ^~~~~~~~~~~~~~~~~~
./include/linux/dev_printk.h:110:23: note: in definition of macro 'dev_printk_index_wrap'
  110 |   _p_func(dev, fmt, ##__VA_ARGS__);   \
      |                       ^~~~~~~~~~~
drivers/pci/controller/pcie-mt7621.c:234:3: note: in expansion of macro 'dev_info'
  234 |   dev_info(dev, "PCI coherence region base: 0x%08llx, mask/settings: 0x%08llx\n",
      |   ^~~~~~~~
cc1: all warnings being treated as errors

The problem is that the <asm/mips-cps.h> head file was missing
and it can resolved when include the file.

Fix: <2bdd5238e756> ("PCI: mt7621: Add MediaTek MT7621 PCIe host controller driver")
Signed-off-by: weirongguang <weirongguang at kylinos.cn>
---
 drivers/pci/controller/pcie-mt7621.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/pci/controller/pcie-mt7621.c b/drivers/pci/controller/pcie-mt7621.c
index b60dfb45ef7b..8a009e427a25 100644
--- a/drivers/pci/controller/pcie-mt7621.c
+++ b/drivers/pci/controller/pcie-mt7621.c
@@ -29,6 +29,7 @@
 #include <linux/platform_device.h>
 #include <linux/reset.h>
 #include <linux/sys_soc.h>
+#include <asm/mips-cps.h>
 
 /* MediaTek-specific configuration registers */
 #define PCIE_FTS_NUM			0x70c
-- 
2.25.1


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