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Tue, 30 Jan 2024 10:19:43 -0800 (PST) Received: from thinkpad ([103.28.246.123]) by smtp.gmail.com with ESMTPSA id s10-20020a63e80a000000b005cf5bf78b74sm8464001pgh.17.2024.01.30.10.19.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 30 Jan 2024 10:19:42 -0800 (PST) Date: Tue, 30 Jan 2024 23:49:38 +0530 From: Manivannan Sadhasivam To: Kalle Valo Cc: mhi@lists.linux.dev, ath11k@lists.infradead.org, linux-wireless@vger.kernel.org Subject: Re: [PATCH RFC v2 2/8] bus: mhi: host: add new interfaces to handle MHI channels directly Message-ID: <20240130181938.GB4218@thinkpad> References: <20231127162022.518834-1-kvalo@kernel.org> <20231127162022.518834-3-kvalo@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20231127162022.518834-3-kvalo@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240130_101945_397153_D22A7F35 X-CRM114-Status: GOOD ( 29.81 ) X-BeenThere: ath11k@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "ath11k" Errors-To: ath11k-bounces+ath11k=archiver.kernel.org@lists.infradead.org On Mon, Nov 27, 2023 at 06:20:16PM +0200, Kalle Valo wrote: > From: Baochen Qiang > > When using mhi_power_down_no_destroy() MHI hosts need to unprepare MHI channels > by themselves. Similarly, MHI stack will also not create new MHI device since > old devices were not destroyed, so MHI hosts need to prepare channels as well. > Hence add these two interfaces to make that possible. > > Tested-on: WCN6855 hw2.0 PCI WLAN.HSP.1.1-03125-QCAHSPSWPL_V1_V2_SILICONZ_LITE-3.6510.30 > > Signed-off-by: Baochen Qiang > Signed-off-by: Kalle Valo > --- > drivers/bus/mhi/host/main.c | 107 ++++++++++++++++++++++++++++++++++++ > include/linux/mhi.h | 20 ++++++- > 2 files changed, 126 insertions(+), 1 deletion(-) > > diff --git a/drivers/bus/mhi/host/main.c b/drivers/bus/mhi/host/main.c > index d80975f4bba8..3f677fc628ad 100644 > --- a/drivers/bus/mhi/host/main.c > +++ b/drivers/bus/mhi/host/main.c > @@ -1669,6 +1669,58 @@ int mhi_prepare_for_transfer_autoqueue(struct mhi_device *mhi_dev) > } > EXPORT_SYMBOL_GPL(mhi_prepare_for_transfer_autoqueue); > > +static int ____mhi_prepare_for_transfer(struct device *dev, void *data) "__mhi_prepare_all_for_transfer" > +{ > + struct mhi_device *mhi_dev; > + struct mhi_chan *ul_chan, *dl_chan; > + enum mhi_ee_type ee = MHI_EE_MAX; Reverse Xmas order, please. > + > + if (dev->bus != &mhi_bus_type) > + return 0; > + > + mhi_dev = to_mhi_device(dev); > + > + /* Only prepare virtual devices that are attached to bus */ "Only prepare virtual devices for the channels". Here and below. > + if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER) > + return 0; > + > + /* There are cases where there is no MHI client driver matches > + * this device, we are not allowed to do prepare for it. > + */ Use the preferred style for comment: /* * ... */ > + if (!mhi_dev->id) > + return 0; > + > + ul_chan = mhi_dev->ul_chan; > + dl_chan = mhi_dev->dl_chan; > + > + /* > + * If execution environment is specified, remove only those devices that > + * started in them based on ee_mask for the channels as we move on to a > + * different execution environment > + */ > + if (data) > + ee = *(enum mhi_ee_type *)data; > + > + if (ul_chan && ee != MHI_EE_MAX && !(ul_chan->ee_mask & BIT(ee))) > + return 0; > + > + Remove extra newline. > + if (dl_chan && ee != MHI_EE_MAX && !(dl_chan->ee_mask & BIT(ee))) > + return 0; > + > + if (dl_chan->pre_alloc) > + return mhi_prepare_for_transfer_autoqueue(mhi_dev); > + else > + return mhi_prepare_for_transfer(mhi_dev); > +} > + > +int mhi_prepare_all_for_transfer(struct mhi_controller *mhi_cntrl) > +{ > + return device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, > + ____mhi_prepare_for_transfer); > +} > +EXPORT_SYMBOL_GPL(mhi_prepare_all_for_transfer); > + > void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev) > { > struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; > @@ -1684,3 +1736,58 @@ void mhi_unprepare_from_transfer(struct mhi_device *mhi_dev) > } > } > EXPORT_SYMBOL_GPL(mhi_unprepare_from_transfer); > + > +static int ____mhi_unprepare_from_transfer(struct device *dev, void *data) __mhi_unprepare_all_from_transfer > +{ > + struct mhi_device *mhi_dev; > + struct mhi_chan *ul_chan, *dl_chan; > + enum mhi_ee_type ee = MHI_EE_MAX; > + > + if (dev->bus != &mhi_bus_type) > + return 0; > + > + mhi_dev = to_mhi_device(dev); > + > + /* Only unprepare virtual devices that are attached to bus */ > + if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER) > + return 0; > + > + /* There are cases where there is no MHI client driver matches > + * this device, so it is not probed or prepared, no need to > + * do unprepare for it. > + */ > + if (!mhi_dev->id) > + return 0; > + > + ul_chan = mhi_dev->ul_chan; > + dl_chan = mhi_dev->dl_chan; > + > + /* > + * If execution environment is specified, remove only those devices that > + * started in them based on ee_mask for the channels as we move on to a > + * different execution environment > + */ > + if (data) > + ee = *(enum mhi_ee_type *)data; > + > + if (ul_chan) { > + if (ee != MHI_EE_MAX && !(ul_chan->ee_mask & BIT(ee))) > + return 0; > + } > + > + if (dl_chan) { > + if (ee != MHI_EE_MAX && !(dl_chan->ee_mask & BIT(ee))) > + return 0; > + } > + > + mhi_unprepare_from_transfer(mhi_dev); > + > + return 0; > +} > + > +int mhi_unprepare_all_from_transfer(struct mhi_controller *mhi_cntrl) > +{ > + return device_for_each_child(&mhi_cntrl->mhi_dev->dev, NULL, > + ____mhi_unprepare_from_transfer); > +} > +EXPORT_SYMBOL_GPL(mhi_unprepare_all_from_transfer); > diff --git a/include/linux/mhi.h b/include/linux/mhi.h > index ae092bc8b97e..dcf62a57056a 100644 > --- a/include/linux/mhi.h > +++ b/include/linux/mhi.h > @@ -668,7 +668,7 @@ static inline void mhi_power_down(struct mhi_controller *mhi_cntrl, bool gracefu > * destroy struct devices. This is a variant for mhi_power_down() and is a > * workaround to make it possible to use mhi_power_up() in a resume > * handler. When using this variant the caller must also call > - * mhi_prepare_all_for_transfer_autoqueue() and > + * mhi_prepare_all_for_transfer() and This change belongs to previous patch. > * mhi_unprepare_all_from_transfer(). > * > * @mhi_cntrl: MHI controller > @@ -842,4 +842,22 @@ int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, > */ > bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir); > > +/** > + * mhi_prepare_all_for_transfer - if you are using > + * mhi_power_down_no_destroy() variant this needs to be called after > + * calling mhi_power_up(). Add info about what this API does also. > + * > + * @mhi_cntrl: MHI controller > + */ > +int mhi_prepare_all_for_transfer(struct mhi_controller *mhi_cntrl); > + > +/** > + * mhi_unprepare_all_from_transfer - if you are using > + * mhi_power_down_no_destroy() variant this function needs to be called > + * before calling mhi_power_down_no_destroy(). Same as above. - Mani > + * > + * @mhi_cntrl: MHI controller > + */ > +int mhi_unprepare_all_from_transfer(struct mhi_controller *mhi_cntrl); > + > #endif /* _MHI_H_ */ > -- > 2.39.2 > > -- மணிவண்ணன் சதாசிவம்