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Bottomley" , "Martin K. Petersen" , Matthias Brugger , AngeloGioacchino Del Regno CC: , , , , , , , Ed Tsai , Subject: [PATCH v2 2/2] ufs: host: mediatek: Add VCC on delay for stability Date: Tue, 10 Mar 2026 08:52:30 +0800 Message-ID: <20260310005230.4001904-6-ed.tsai@mediatek.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260310005230.4001904-2-ed.tsai@mediatek.com> References: <20260310005230.4001904-2-ed.tsai@mediatek.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-MTK: N Content-Type: text/plain; charset="utf-8" From: Ed Tsai Introduce a delay after enabling UFS5 VCC for MT6995 to ensure voltage stability before refclk activation. Signed-off-by: Ed Tsai Reviewed-by: Bart Van Assche --- drivers/ufs/host/ufs-mediatek.c | 11 +++++++++++ drivers/ufs/host/ufs-mediatek.h | 4 ++++ 2 files changed, 15 insertions(+) diff --git a/drivers/ufs/host/ufs-mediatek.c b/drivers/ufs/host/ufs-mediate= k.c index b3daaa07e925..4618d7834414 100644 --- a/drivers/ufs/host/ufs-mediatek.c +++ b/drivers/ufs/host/ufs-mediatek.c @@ -1960,6 +1960,8 @@ static int ufs_mtk_apply_dev_quirks(struct ufs_hba *h= ba) =20 static void ufs_mtk_fixup_dev_quirks(struct ufs_hba *hba) { + struct ufs_mtk_host *host =3D ufshcd_get_variant(hba); + ufshcd_fixup_dev_quirks(hba, ufs_mtk_dev_fixups); =20 if (ufs_mtk_is_broken_vcc(hba) && hba->vreg_info.vcc) { @@ -1971,6 +1973,15 @@ static void ufs_mtk_fixup_dev_quirks(struct ufs_hba = *hba) hba->dev_quirks &=3D ~UFS_DEVICE_QUIRK_DELAY_BEFORE_LPM; } =20 + /* + * Add a delay after enabling UFS5 VCC to ensure the voltage + * is stable before the refclk is enabled. + */ + if (hba->dev_info.wspecversion >=3D 0x0500 && + (host->ip_ver =3D=3D IP_VER_MT6995_A0 || + host->ip_ver =3D=3D IP_VER_MT6995_B0)) + hba->quirks |=3D UFSHCD_QUIRK_VCC_ON_DELAY; + ufs_mtk_vreg_fix_vcc(hba); ufs_mtk_vreg_fix_vccqx(hba); ufs_mtk_fix_ahit(hba); diff --git a/drivers/ufs/host/ufs-mediatek.h b/drivers/ufs/host/ufs-mediate= k.h index 9747277f11e8..8547a6f04990 100644 --- a/drivers/ufs/host/ufs-mediatek.h +++ b/drivers/ufs/host/ufs-mediatek.h @@ -220,6 +220,10 @@ enum { IP_VER_MT6991_B0 =3D 0x10470000, IP_VER_MT6993 =3D 0x10480000, =20 + /* UFSHCI 5.0 */ + IP_VER_MT6995_A0 =3D 0x10490000, + IP_VER_MT6995_B0 =3D 0x10500000, + IP_VER_NONE =3D 0xFFFFFFFF }; =20 --=20 2.45.2