Struct TxFfeRestrictions 

#[non_exhaustive]
pub struct TxFfeRestrictions {
    pub pre_shoot_only: bool,
    pub de_emphasis_only: bool,
    pub no_ffe: bool,
}

Restrictions on the TxFFE components, as a compliance tester sets them.

TxFFE combines two components: pre-shoot (pre-cursor) and de-emphasis (post-cursor). The sink’s Source_Test_Configuration register (SCDC 0x35, bits 1–3) can restrict them, and the three bits are carried here exactly as written, for the whole link. Each bit’s plain meaning:

• pre_shoot_only (TxFFE_Pre_Shoot_Only): pre-shoot only, no de-emphasis.
• de_emphasis_only (TxFFE_De_Emphasis_Only): de-emphasis only, no pre-shoot.
• no_ffe (TxFFE_No_FFE): neither.

The default (no bit set) restricts nothing. The bits accompany a compliance test: the reference drivers that act on them do so while the sink requests the DDE compliance pattern (LTP 4).

How to combine them is the PHY’s to decide, because the reference implementations disagree and the specification text is not available to this crate. The AMD display driver (dpcs30_program_eq_setting) treats each “only” bit as removing the other component, so both set gives no FFE, and no_ffe overrides both. The Rockchip HDPTX PHY driver treats bits 1–2 as enabling their component, so both set gives full FFE, and does not read no_ffe. A backend documents which it follows. The level in each lane’s LaneEqParams still applies within what the restrictions allow.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

pre_shoot_only: bool

TxFFE_Pre_Shoot_Only (bit 1): use pre-shoot only.

de_emphasis_only: bool

TxFFE_De_Emphasis_Only (bit 2): use de-emphasis only.

no_ffe: bool

TxFFE_No_FFE (bit 3): use no TxFFE.

Implementations

impl TxFfeRestrictions

pub const fn new( pre_shoot_only: bool, de_emphasis_only: bool, no_ffe: bool, ) -> TxFfeRestrictions

Constructs TxFfeRestrictions from the three bits, in register order.

Trait Implementations

impl Clone for TxFfeRestrictions

fn clone(&self) -> TxFfeRestrictions

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for TxFfeRestrictions

impl Debug for TxFfeRestrictions

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for TxFfeRestrictions

fn default() -> TxFfeRestrictions

Returns the “default value” for a type.

impl Eq for TxFfeRestrictions

impl Hash for TxFfeRestrictions

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TxFfeRestrictions

fn eq(&self, other: &TxFfeRestrictions) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TxFfeRestrictions