From: Martin Blumenstingl <martin.blumenstingl@googlemail.com>
To: Anand Moon <linux.amoon@gmail.com>
Cc: Kishon Vijay Abraham I <kishon@ti.com>,
Vinod Koul <vkoul@kernel.org>,
Neil Armstrong <narmstrong@baylibre.com>,
Kevin Hilman <khilman@baylibre.com>,
Jerome Brunet <jbrunet@baylibre.com>,
Philipp Zabel <p.zabel@pengutronix.de>,
linux-phy@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: Re: [RFCv1 7/8] phy: amlogic: meson8b-usb2: Power off the PHY by putting it into reset mode.
Date: Fri, 18 Jun 2021 00:37:02 +0200 [thread overview]
Message-ID: <CAFBinCC0KScn6cJ36ZB_=TRncOOCXJHWwR3s=o3TobH=yOrGJA@mail.gmail.com> (raw)
In-Reply-To: <20210617194154.2397-8-linux.amoon@gmail.com>
Hi Anand,
On Thu, Jun 17, 2021 at 9:44 PM Anand Moon <linux.amoon@gmail.com> wrote:
[...]
> @@ -245,8 +250,6 @@ static int phy_meson8b_usb2_power_on(struct phy *phy)
> regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_FSEL_MASK,
> 0x5 << REG_CTRL_FSEL_SHIFT);
> /* reset the PHY */
> - regmap_update_bits(priv->regmap, REG_CTRL, REG_CTRL_POWER_ON_RESET,
> - REG_CTRL_POWER_ON_RESET);
The vendor driver uses the following sequence for the power on reset:
- set the power on reset bit
- wait 500us
- clear the power on reset bit
- wait 500us
With your change we now:
- wait 500us
- clear the power on reset bit
- wait 500us
I don't know if this is sufficient to bring the PHY into a well-defined state.
Maybe it works, maybe it doesn't reset at all in this case - I don't
know how to verify this though.
Best regards,
Martin
next prev parent reply other threads:[~2021-06-17 22:37 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-17 19:41 [RFCv1 0/8] Meson-8b and Meson-gxbb USB phy code re-structure Anand Moon
2021-06-17 19:41 ` [RFCv1 1/8] phy: amlogic: meson8b-usb2: Use clock bulk to get clocks for phy Anand Moon
2021-06-17 22:33 ` Martin Blumenstingl
2021-06-18 15:32 ` Anand Moon
2021-06-17 19:41 ` [RFCv1 2/8] phy: amlogic: meson8b-usb2: Use phy init callback function Anand Moon
2021-06-18 12:26 ` Martin Blumenstingl
2021-06-18 13:17 ` Anand Moon
2021-06-17 19:41 ` [RFCv1 3/8] phy: amlogic: meson8b-usb2: Use phy exit " Anand Moon
2021-06-17 19:41 ` [RFCv1 4/8] phy: amlogic: meson8b-usb2: Use phy set_mode " Anand Moon
2021-06-17 22:16 ` Martin Blumenstingl
2021-06-18 13:19 ` Anand Moon
2021-06-18 20:01 ` Martin Blumenstingl
2021-06-21 7:20 ` Anand Moon
2021-06-22 20:27 ` Martin Blumenstingl
2021-06-17 19:41 ` [RFCv1 5/8] phy: amlogic: meson8b-usb2: Reorder phy poweroff " Anand Moon
2021-06-17 22:16 ` Martin Blumenstingl
2021-06-18 15:33 ` Anand Moon
2021-06-17 19:41 ` [RFCv1 6/8] phy: amlogic: meson8b-usb2: Use phy reset " Anand Moon
2021-06-17 22:24 ` Martin Blumenstingl
2021-06-18 15:33 ` Anand Moon
2021-06-18 20:06 ` Martin Blumenstingl
2021-06-21 7:15 ` Anand Moon
2021-06-22 20:11 ` Martin Blumenstingl
2021-06-24 14:54 ` Anand Moon
2021-06-27 20:07 ` Anand Moon
2021-06-27 20:25 ` Martin Blumenstingl
2021-07-02 19:13 ` Anand Moon
2021-06-17 19:41 ` [RFCv1 7/8] phy: amlogic: meson8b-usb2: Power off the PHY by putting it into reset mode Anand Moon
2021-06-17 22:37 ` Martin Blumenstingl [this message]
2021-06-21 7:15 ` Anand Moon
2021-06-22 20:00 ` Martin Blumenstingl
2021-06-17 19:41 ` [RFCv1 8/8] phy: amlogic: meson8b-usb2: don't log an error on -EPROBE_DEFER Anand Moon
2021-06-17 22:26 ` Martin Blumenstingl
2021-06-17 22:11 ` [RFCv1 0/8] Meson-8b and Meson-gxbb USB phy code re-structure Martin Blumenstingl
2021-06-18 13:20 ` Anand Moon
2021-06-18 20:16 ` Martin Blumenstingl
2021-06-21 7:21 ` Anand Moon
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