Hi, > At approximately line 41 of nvidia driver file nv-i2c.c, in function > nv_i2c_algo_master_transfer(), there's an if-test for symbol I2C_M_DMA_SAFE. > If the symbol is not defined, a call to the function with the bit set fails > with error -EINVAL. The file includes "linux/i2c.h", so apparently there are > versions of I2c.h in which the flag is undefined. I2C_M_DMA_SAFE is a hint for controller drivers that the buffer is DMA capable. It is not something the controller driver needs to support actively. Bailing out on this flag is wrong. Do I need to mention that such misconceptions are the super-downside of out-of-tree drivers? (I know that you are only a user of this driver, so not your fault) Happy hacking, Wolfram
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