On 3/5/2026 11:04 PM, Bean Huo wrote:

Can,

On Wed, 2026-03-04 at 05:53 -0800, Can Guo wrote:

quoted

Hi,

The UFS 5.0 standard was published today,

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

That is also my plan for next version, thanks!

quoted

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.

This is a good question. In this version, once TX EQTR fails, 
ufshcd_config_pwr_mode()
would bail with error before calling ufshcd_change_power_mode(). But I 
am planning
to loosen it in next version, that is, if TX EQTR fails the TX 
Equalization settings will remain
unchanged and ufshcd_config_pwr_mode() would anyways go ahead change 
power mode.

Thanks,
Can Guo.

Kind regards,
Bean