On 5/1/2026 9:16 PM, Can Guo wrote:
> Add a quirk to support TX Equalization Training (EQTR) using Adapt L0L1L2L3
> length which is larger than what is allowed by M-PHY spec ver 6.0.
>
> Signed-off-by: Can Guo <can.guo@oss.qualcomm.com>

Reviewed-by: Ziqi Chen <ziqi.chen@oss.qualcomm.com>

> ---
>   drivers/ufs/core/ufs-txeq.c | 8 ++++++--
>   include/ufs/ufshcd.h        | 7 +++++++
>   2 files changed, 13 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/ufs/core/ufs-txeq.c b/drivers/ufs/core/ufs-txeq.c
> index b2dc89124353..fe647450a7a1 100644
> --- a/drivers/ufs/core/ufs-txeq.c
> +++ b/drivers/ufs/core/ufs-txeq.c
> @@ -740,7 +740,9 @@ static int ufshcd_setup_tx_eqtr_adapt_length(struct ufs_hba *hba,
>   		if (adapt_l0l1l2l3_cap_local > ADAPT_L0L1L2L3_LENGTH_MAX) {
>   			dev_err(hba->dev, "local RX_HS_G%u_ADAPT_INITIAL_L0L1L2L3_CAP (0x%x) exceeds MAX\n",
>   				gear, adapt_l0l1l2l3_cap_local);
> -			return -EINVAL;
> +
> +			if (!(hba->quirks & UFSHCD_QUIRK_EXTENDED_TX_EQTR_ADAPT_LENGTH_L0L1L2L3))
> +				return -EINVAL;
>   		}
> 
>   		ret = ufshcd_dme_get(hba, UIC_ARG_MIB(PA_PEERRXHSG6ADAPTINITIALL0L1L2L3),
> @@ -751,7 +753,9 @@ static int ufshcd_setup_tx_eqtr_adapt_length(struct ufs_hba *hba,
>   		if (adapt_l0l1l2l3_cap_peer > ADAPT_L0L1L2L3_LENGTH_MAX) {
>   			dev_err(hba->dev, "peer RX_HS_G%u_ADAPT_INITIAL_L0L1L2L3_CAP (0x%x) exceeds MAX\n",
>   				gear, adapt_l0l1l2l3_cap_peer);
> -			return -EINVAL;
> +
> +			if (!(hba->quirks & UFSHCD_QUIRK_EXTENDED_TX_EQTR_ADAPT_LENGTH_L0L1L2L3))
> +				return -EINVAL;
>   		}
> 
>   		t_adapt_l0l1l2l3_local = adapt_cap_to_t_adapt_l0l1l2l3(adapt_l0l1l2l3_cap_local);
> diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h
> index cfbc75d8df83..7a7c07636cf7 100644
> --- a/include/ufs/ufshcd.h
> +++ b/include/ufs/ufshcd.h
> @@ -804,6 +804,13 @@ enum ufshcd_quirks {
>   	 * delay after enabling VCC to ensure it's stable.
>   	 */
>   	UFSHCD_QUIRK_VCC_ON_DELAY			= 1 << 27,
> +
> +	/*
> +	 * This quirk indicates that Host supports TX Equalization Training
> +	 * (EQTR) using Adapt L0L1L2L3 length which is larger than what is
> +	 * allowed by M-PHY spec ver 6.0.
> +	 */
> +	UFSHCD_QUIRK_EXTENDED_TX_EQTR_ADAPT_LENGTH_L0L1L2L3	= 1 << 28,
>   };
> 
>   enum ufshcd_caps {