Re: [PATCH v2 00/11] scsi: ufs: Add TX Equalization support for UFS 5.0

[Bean Huo]

Can, 

On Wed, 2026-03-04 at 05:53 -0800, Can Guo wrote:
> Hi,
> 
> The UFS 5.0 standard was published today, 

Myabe replace time sensitive wording “published today” with stable wording?


> introducing support for HS-G6
> (23.2 Gbps per lane) through the new UniPro V3.0 interconnect layer and
> M-PHY V6.0 physical layer specifications. To achieve reliable operation
> at these higher speeds, UniPro V3.0 introduces TX Equalization and
> Pre-Coding mechanisms that are essential for signal integrity.
> 
> This patch series implements TX Equalization support in the UFS core
> driver as specified in UFSHCI v5.0, along with the necessary vendor
> operations and a reference implementation for Qualcomm UFS host
> controllers.
> 
> Background
> ==========
> 
> TX Equalization is a signal conditioning technique that compensates for
> channel impairments at high data rates (HS-G4 through HS-G6). It works
> by adjusting two key parameters:
> 
> - PreShoot: Pre-emphasis applied before the main signal transition
> - DeEmphasis: De-emphasis applied after the main signal transition
> 
> UniPro V3.0 defines TX Equalization Training (EQTR) procedure to
> automatically discover optimal TX Equalization settings. The EQTR
> procedure:
> 
> 1. Starts from the most reliable link state (HS-G1)
> 2. Iterates through all possible PreShoot and DeEmphasis combinations
> 3. Evaluates signal quality using Figure of Merit (FOM) measurements
> 4. Selects the best settings for both host and device TX lanes
> 

what happens when EQTR fails, mabye you have this comments in the patch.

Kind regards,
Bean