Documentation/ABI/testing/sysfs-platform-hidma-mgmt

   1 What:           /sys/devices/platform/hidma-mgmt*/chanops/chan*/priority
   2                 /sys/devices/platform/QCOM8060:*/chanops/chan*/priority
   3 Date:           Nov 2015
   4 KernelVersion:  4.4
   5 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
   6 Description:
   7                 Contains either 0 or 1 and indicates if the DMA channel is a
   8                 low priority (0) or high priority (1) channel.
   9
  10 What:           /sys/devices/platform/hidma-mgmt*/chanops/chan*/weight
  11                 /sys/devices/platform/QCOM8060:*/chanops/chan*/weight
  12 Date:           Nov 2015
  13 KernelVersion:  4.4
  14 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  15 Description:
  16                 Contains 0..15 and indicates the weight of the channel among
  17                 equal priority channels during round robin scheduling.
  18
  19 What:           /sys/devices/platform/hidma-mgmt*/chreset_timeout_cycles
  20                 /sys/devices/platform/QCOM8060:*/chreset_timeout_cycles
  21 Date:           Nov 2015
  22 KernelVersion:  4.4
  23 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  24 Description:
  25                 Contains the platform specific cycle value to wait after a
  26                 reset command is issued. If the value is chosen too short,
  27                 then the HW will issue a reset failure interrupt. The value
  28                 is platform specific and should not be changed without
  29                 consultance.
  30
  31 What:           /sys/devices/platform/hidma-mgmt*/dma_channels
  32                 /sys/devices/platform/QCOM8060:*/dma_channels
  33 Date:           Nov 2015
  34 KernelVersion:  4.4
  35 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  36 Description:
  37                 Contains the number of dma channels supported by one instance
  38                 of HIDMA hardware. The value may change from chip to chip.
  39
  40 What:           /sys/devices/platform/hidma-mgmt*/hw_version_major
  41                 /sys/devices/platform/QCOM8060:*/hw_version_major
  42 Date:           Nov 2015
  43 KernelVersion:  4.4
  44 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  45 Description:
  46                 Version number major for the hardware.
  47
  48 What:           /sys/devices/platform/hidma-mgmt*/hw_version_minor
  49                 /sys/devices/platform/QCOM8060:*/hw_version_minor
  50 Date:           Nov 2015
  51 KernelVersion:  4.4
  52 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  53 Description:
  54                 Version number minor for the hardware.
  55
  56 What:           /sys/devices/platform/hidma-mgmt*/max_rd_xactions
  57                 /sys/devices/platform/QCOM8060:*/max_rd_xactions
  58 Date:           Nov 2015
  59 KernelVersion:  4.4
  60 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  61 Description:
  62                 Contains a value between 0 and 31. Maximum number of
  63                 read transactions that can be issued back to back.
  64                 Choosing a higher number gives better performance but
  65                 can also cause performance reduction to other peripherals
  66                 sharing the same bus.
  67
  68 What:           /sys/devices/platform/hidma-mgmt*/max_read_request
  69                 /sys/devices/platform/QCOM8060:*/max_read_request
  70 Date:           Nov 2015
  71 KernelVersion:  4.4
  72 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  73 Description:
  74                 Size of each read request. The value needs to be a power
  75                 of two and can be between 128 and 1024.
  76
  77 What:           /sys/devices/platform/hidma-mgmt*/max_wr_xactions
  78                 /sys/devices/platform/QCOM8060:*/max_wr_xactions
  79 Date:           Nov 2015
  80 KernelVersion:  4.4
  81 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  82 Description:
  83                 Contains a value between 0 and 31. Maximum number of
  84                 write transactions that can be issued back to back.
  85                 Choosing a higher number gives better performance but
  86                 can also cause performance reduction to other peripherals
  87                 sharing the same bus.
  88
  89
  90 What:           /sys/devices/platform/hidma-mgmt*/max_write_request
  91                 /sys/devices/platform/QCOM8060:*/max_write_request
  92 Date:           Nov 2015
  93 KernelVersion:  4.4
  94 Contact:        "Sinan Kaya <okaya@cudeaurora.org>"
  95 Description:
  96                 Size of each write request. The value needs to be a power
  97                 of two and can be between 128 and 1024.