Re: [PATCH 3/3] ufs: core: Optimize ufshcd_add_uic_command_trace()

[Bart Van Assche <bvanassche@acm.org>]

On 4/21/26 1:45 AM, Peter Wang (王信友) wrote:
> In the complete case, all these commands and arguments 1 to 3
> are filled by hardware. If we do not read them from the hardware,
> how can we be sure of the actual values written by the hardware?

Hi Peter,

Are we perhaps each interpreting the UFSHCI standard in a different way?
My understanding is that the UFSHCI command flow is as follows:
* First, UICCMDARG1, UICCMDARG2 and UICCMDARG3 are written by the host.
* Next, UICCMD is written by the host. This causes the host controller
   to execute the UIC command.
* Upon completion of the command, the host controller updates the lowest
   byte of UICCMDARG2. UICCMDARG3 is only updated after execution of the
   following commands has finished: DME_GET, DME_SET, DME_PEER_GET and
   DME_PEER_SET.

Thanks,

Bart.