[PATCH] drm/amdgpu: use native mode for dp aux transfer

[kernel test robot]

Hi Zhenneng,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on drm-misc/drm-misc-next]
[also build test WARNING on linus/master v5.19 next-20220811]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Zhenneng-Li/drm-amdgpu-use-native-mode-for-dp-aux-transfer/20220811-193443
base:   git://anongit.freedesktop.org/drm/drm-misc drm-misc-next
config: i386-allyesconfig (https://download.01.org/0day-ci/archive/20220812/202208120737.JG7NkugC-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
        # https://github.com/intel-lab-lkp/linux/commit/1098c6fecb4292d634dbdccff9e720400dc7138d
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Zhenneng-Li/drm-amdgpu-use-native-mode-for-dp-aux-transfer/20220811-193443
        git checkout 1098c6fecb4292d634dbdccff9e720400dc7138d
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/gpu/drm/amd/amdgpu/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp at intel.com>

All warnings (new ones prefixed by >>):

>> drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c:73:10: warning: no previous prototype for 'venus_mm_rreg_slow' [-Wmissing-prototypes]
      73 | uint32_t venus_mm_rreg_slow(struct amdgpu_device *adev, uint32_t reg)
         |          ^~~~~~~~~~~~~~~~~~
>> drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c:84:6: warning: no previous prototype for 'venus_mm_wreg_slow' [-Wmissing-prototypes]
      84 | void venus_mm_wreg_slow(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
         |      ^~~~~~~~~~~~~~~~~~


vim +/venus_mm_rreg_slow +73 drivers/gpu/drm/amd/amdgpu/amdgpu_dp_auxch.c

    69	
    70	#define R100_MM_INDEX                   0x0000
    71	#define R100_MM_DATA                      0x0004
    72	#define AMDGPU_MIN_MMIO_SIZE 0x10000
  > 73	uint32_t venus_mm_rreg_slow(struct amdgpu_device *adev, uint32_t reg)
    74	{
    75	        unsigned long flags;
    76	        uint32_t ret;
    77	
    78	        spin_lock_irqsave(&adev->mmio_idx_lock, flags);
    79	        writel(reg, ((void __iomem *)adev->rmmio) + R100_MM_INDEX);
    80	        ret = readl(((void __iomem *)adev->rmmio) + R100_MM_DATA);
    81	        spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
    82	        return ret;
    83	}
  > 84	void venus_mm_wreg_slow(struct amdgpu_device *adev, uint32_t reg, uint32_t v)
    85	{
    86	        unsigned long flags;
    87	
    88	        spin_lock_irqsave(&adev->mmio_idx_lock, flags);
    89	        writel(reg, ((void __iomem *)adev->rmmio) + R100_MM_INDEX);
    90	        writel(v, ((void __iomem *)adev->rmmio) + R100_MM_DATA);
    91	        spin_unlock_irqrestore(&adev->mmio_idx_lock, flags);
    92	}
    93	static inline uint32_t venus_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
    94	                                    bool always_indirect)
    95	{
    96	        /* The mmio size is 64kb at minimum. Allows the if to be optimized out. */
    97	        if ((reg < adev->rmmio_size || reg < AMDGPU_MIN_MMIO_SIZE) && !always_indirect)
    98	                return readl(((void __iomem *)adev->rmmio) + reg);
    99	        else
   100	                return venus_mm_rreg_slow(adev, reg);
   101	}
   102	static inline void venus_mm_wreg(struct amdgpu_device *adev, uint32_t reg, uint32_t v,
   103	                                bool always_indirect)
   104	{
   105	        if ((reg < adev->rmmio_size || reg < AMDGPU_MIN_MMIO_SIZE) && !always_indirect)
   106	                writel(v, ((void __iomem *)adev->rmmio) + reg);
   107	        else
   108	                venus_mm_wreg_slow(adev, reg, v);
   109	}
   110	

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