[RFC PATCH] dmaengine: xilinx_dma: Fix per-channel direction reporting via device_caps

[Rahul Navale]

From: Rahul Navale <rahul.navale at ifm.com>

>Please undo the latest Xilinx DMA patch I sent.
>To get some more data, could you apply the following patch (keep RFC
>patch and debug stuff) and rerun with 7e01511443c3 a) applied and b)
>reverted and post logs for both cases:

I have applied provided patch (with kept RFC patch and debug stuff) and with
7e01511443c3 applied. logs:

root at pdm3:~# dmesg | grep xilinx_dma_device_caps                                                                                                                                         
[    0.285057] xilinx_dma_device_caps: caps->directions = 0x00000001
[    0.285060] xilinx_dma_device_caps: caps->directions = 0x00000001
[    0.285759] xilinx_dma_device_caps: caps->directions = 0x00000002
[    0.285763] xilinx_dma_device_caps: caps->directions = 0x00000002
[    7.535143] xilinx_dma_device_caps: caps->directions = 0x00000001
[    7.535147] xilinx_dma_device_caps: caps->directions = 0x00000001
root at pdm3:~# dmesg | grep ptr_res
root at pdm3:~# aplay closetoyou.wav 
Playing WAVE 'closetoyou.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
^CAborted by signal Interrupt...
aplay: pcm_write:2178: write error: Interrupted system call
root at pdm3:~# 
root at pdm3:~# dmesg | grep ptr_res
[  198.997591] ptr_res: ptr = 0x00000000
[  199.002885] ptr_res: ptr = 0x00000000
[  199.002900] ptr_res: ptr = 0x00000000
[  199.002925] ptr_res: ptr = 0x00000000
[  199.002946] ptr_res: ptr = 0x00000000
[  199.117775] ptr_res: ptr = 0x00000000
[  199.117818] ptr_res: ptr = 0x00000000
[  199.117839] ptr_res: ptr = 0x00000000
[  199.242766] ptr_res: ptr = 0x00000000
[  199.242800] ptr_res: ptr = 0x00000000
[  199.242820] ptr_res: ptr = 0x00000000


Also I have applied provided patch (with kept RFC patch and debug stuff) and with
7e01511443c3 reverted. logs:

root at pdm3:~# dmesg | grep xilinx_dma_device_caps
root at pdm3:~# dmesg | grep ptr_res
root at pdm3:~# aplay closetoyou.wav 
Playing WAVE 'closetoyou.wav' : Signed 16 bit Little Endian, Rate 48000 Hz, Stereo
^CAborted by signal Interrupt...
aplay: pcm_write:2178: write error: Interrupted system call
root at pdm3:~# 
root at pdm3:~# dmesg | grep ptr_res
[   60.480754] ptr_res_no: ptr = 0x00000000
[   60.486058] ptr_res_no: ptr = 0x00000000
[   60.486070] ptr_res_no: ptr = 0x00000000
[   60.486094] ptr_res_no: ptr = 0x00000000
[   60.486113] ptr_res_no: ptr = 0x00000000
[   60.600877] ptr_res_no: ptr = 0x00001770
[   60.600920] ptr_res_no: ptr = 0x00001770
[   60.600939] ptr_res_no: ptr = 0x00001770
[   60.600948] ptr_res_no: ptr = 0x00001770
[   60.600968] ptr_res_no: ptr = 0x00001770
[   60.602739] ptr_res_no: ptr = 0x00001770
[   60.602750] ptr_res_no: ptr = 0x00001770
[   60.725869] ptr_res_no: ptr = 0x00002ee0
[   60.725904] ptr_res_no: ptr = 0x00002ee0
[   60.725921] ptr_res_no: ptr = 0x00002ee0
[   60.725931] ptr_res_no: ptr = 0x00002ee0
[   60.725949] ptr_res_no: ptr = 0x00002ee0
[   60.727667] ptr_res_no: ptr = 0x00002ee0
[   60.727677] ptr_res_no: ptr = 0x00002ee0
[   60.850877] ptr_res_no: ptr = 0x00000000
[   60.850939] ptr_res_no: ptr = 0x00000000
[   60.850960] ptr_res_no: ptr = 0x00000000
[   60.850969] ptr_res_no: ptr = 0x00000000
[   60.851000] ptr_res_no: ptr = 0x00000000
[   60.852750] ptr_res_no: ptr = 0x00000000
[   60.852760] ptr_res_no: ptr = 0x00000000
[   60.975869] ptr_res_no: ptr = 0x00001770
[   60.975905] ptr_res_no: ptr = 0x00001770
[   60.975923] ptr_res_no: ptr = 0x00001770
...
...