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From: Marcel Holtmann <marcel@holtmann.org>
To: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Cc: Andy Gross <agross@kernel.org>,
	Bjorn Andersson <bjorn.andersson@linaro.org>,
	Ulf Hansson <ulf.hansson@linaro.org>,
	Johan Hedberg <johan.hedberg@gmail.com>,
	Luiz Augusto von Dentz <luiz.dentz@gmail.com>,
	Kalle Valo <kvalo@codeaurora.org>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Stanimir Varbanov <svarbanov@mm-sol.com>,
	MSM <linux-arm-msm@vger.kernel.org>,
	linux-mmc@vger.kernel.org,
	open list <linux-kernel@vger.kernel.org>,
	"open list:BLUETOOTH SUBSYSTEM" <linux-bluetooth@vger.kernel.org>,
	ath10k@lists.infradead.org, linux-wireless@vger.kernel.org,
	netdev@vger.kernel.org
Subject: Re: [RFC PATCH 00/15] create power sequencing subsystem
Date: Sat, 21 Aug 2021 08:50:40 +0200	[thread overview]
Message-ID: <551758F2-0B00-4DEB-92C9-37472E46B75D@holtmann.org> (raw)
In-Reply-To: <CAA8EJpoOxerwmwQozL3gp1nX-+oxLMFUFjVPvRy-MoVfPuvqrw@mail.gmail.com>

Hi Dmitry,

>>> This is an RFC of the proposed power sequencer subsystem. This is a
>>> generification of the MMC pwrseq code. The subsystem tries to abstract
>>> the idea of complex power-up/power-down/reset of the devices.
>>> 
>>> The primary set of devices that promted me to create this patchset is
>>> the Qualcomm BT+WiFi family of chips. They reside on serial+platform
>>> interfaces (older generations) or on serial+PCIe (newer generations).
>>> They require a set of external voltage regulators to be powered on and
>>> (some of them) have separate WiFi and Bluetooth enable GPIOs.
>>> 
>>> This patchset being an RFC tries to demonstrate the approach, design and
>>> usage of the pwrseq subsystem. Following issues are present in the RFC
>>> at this moment but will be fixed later if the overall approach would be
>>> viewed as acceptable:
>>> 
>>> - No documentation
>>> While the code tries to be self-documenting proper documentation
>>> would be required.
>>> 
>>> - Minimal device tree bindings changes
>>> There are no proper updates for the DT bindings (thus neither Rob
>>> Herring nor devicetree are included in the To/Cc lists). The dt
>>> schema changes would be a part of v1.
>>> 
>>> - Lack of proper PCIe integration
>>> At this moment support for PCIe is hacked up to be able to test the
>>> PCIe part of qca6390. Proper PCIe support would require automatically
>>> powering up the devices before the scan basing on the proper device
>>> structure in the device tree.
>>> 
>>> ----------------------------------------------------------------
>>> Dmitry Baryshkov (15):
>>>    power: add power sequencer subsystem
>>>    pwrseq: port MMC's pwrseq drivers to new pwrseq subsystem
>>>    mmc: core: switch to new pwrseq subsystem
>>>    ath10k: add support for pwrseq sequencing
>>>    Bluetooth: hci_qca: merge qca_power into qca_serdev
>>>    Bluetooth: hci_qca: merge init paths
>>>    Bluetooth: hci_qca: merge qca_power_on with qca_regulators_init
>>>    Bluetooth: hci_qca: futher rework of power on/off handling
>>>    Bluetooth: hci_qca: add support for pwrseq
>> 
>> any chance you can try to abandon patching hci_qca. The serdev support in hci_uart is rather hacking into old line discipline code and it is not aging well. It is really becoming a mess.
> 
> I wanted to stay away from rewriting the BT code. But... New driver
> would have a bonus point that I don't have to be compatible with old
> bindings. In fact we can even make it the other way around: let the
> old driver always use regulators and make the new driver support only
> the pwrseq. Then it should be possible to drop the old hci_qca driver
> together with dropping the old bindings.
> 
>> I would say that the Qualcomm serial devices could use a separate standalone serdev driver. A while I send an RFC for a new serdev driver.
>> 
>> https://www.spinics.net/lists/linux-bluetooth/msg74918.html
> 
> Any reason why your driver stayed as an RFC and never made it into the
> kernel? Do you plan to revive your old RFCs on H:4 and H:5?

I was missing enough hardware to test it on and frankly I hoped that someone would pick up this work. The HCI line discipline “hack” needs to be removed soon. It is complicated, cumbersome and has a bunch of issues with locking. Mind you that originated in 2.4.6 kernel and is at its core bit-rotting.

If you manage to put QCA support into a separate btqcauart driver, that would be awesome. The btmtkuart driver is another example where Mediatek got its own serdev based driver.

Regards

Marcel


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      parent reply	other threads:[~2021-08-21  6:51 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-17  0:54 Dmitry Baryshkov
2021-08-17  0:54 ` [RFC PATCH 01/15] power: add power sequencer subsystem Dmitry Baryshkov
2021-08-19 23:37   ` Bjorn Andersson
2021-08-17  0:54 ` [RFC PATCH 02/15] pwrseq: port MMC's pwrseq drivers to new pwrseq subsystem Dmitry Baryshkov
2021-08-17  0:54 ` [RFC PATCH 03/15] mmc: core: switch " Dmitry Baryshkov
2021-08-17  0:54 ` [RFC PATCH 04/15] ath10k: add support for pwrseq sequencing Dmitry Baryshkov
2021-08-17  0:54 ` [RFC PATCH 05/15] Bluetooth: hci_qca: merge qca_power into qca_serdev Dmitry Baryshkov
2021-08-17  0:54 ` [RFC PATCH 06/15] Bluetooth: hci_qca: merge init paths Dmitry Baryshkov
2021-08-17  0:54 ` [RFC PATCH 07/15] Bluetooth: hci_qca: merge qca_power_on with qca_regulators_init Dmitry Baryshkov
2021-08-17  0:55 ` [RFC PATCH 08/15] Bluetooth: hci_qca: futher rework of power on/off handling Dmitry Baryshkov
2021-08-17  0:55 ` [RFC PATCH 09/15] Bluetooth: hci_qca: add support for pwrseq Dmitry Baryshkov
2021-08-17  0:55 ` [RFC PATCH 10/15] pwrseq: add support for QCA BT+WiFi power sequencer Dmitry Baryshkov
2021-08-19 23:18   ` Bjorn Andersson
2021-08-20  8:10     ` Dmitry Baryshkov
2021-08-20 16:35       ` Bjorn Andersson
2021-08-17  0:55 ` [RFC PATCH 11/15] arm64: dts: qcom: sdm845-db845c: switch bt+wifi to qca " Dmitry Baryshkov
2021-08-19 23:40   ` Bjorn Andersson
2021-08-17  0:55 ` [RFC PATCH 12/15] arm64: dts: qcom: qrb5165-rb5: add bluetooth support Dmitry Baryshkov
2021-08-17  0:55 ` [RFC PATCH 13/15] arm64: dts: qcom: sdm845-db845c: add second channel support to qca power sequencer Dmitry Baryshkov
2021-08-17  0:55 ` [RFC PATCH 14/15] WIP: PCI: qcom: use pwrseq to power up bus devices Dmitry Baryshkov
2021-08-19 23:44   ` Bjorn Andersson
2021-08-20  8:50     ` Dmitry Baryshkov
2021-08-17  0:55 ` [RFC PATCH 15/15] WIP: arm64: dts: qcom: qrb5165-rb5: add bus-pwrseq property to pcie0 Dmitry Baryshkov
2021-08-19 15:23 ` [RFC PATCH 00/15] create power sequencing subsystem Marcel Holtmann
2021-08-20 13:08   ` Dmitry Baryshkov
2021-08-20 17:02     ` Bjorn Andersson
2021-08-20 18:06       ` Dmitry Baryshkov
2021-08-21  6:50     ` Marcel Holtmann [this message]

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