From: "Martinez, Ricardo" <ricardo.martinez@linux.intel.com>
To: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>
Cc: Netdev <netdev@vger.kernel.org>,
linux-wireless@vger.kernel.org, kuba@kernel.org,
davem@davemloft.net, johannes@sipsolutions.net,
ryazanov.s.a@gmail.com, loic.poulain@linaro.org,
m.chetan.kumar@intel.com, chandrashekar.devegowda@intel.com,
linuxwwan@intel.com, chiranjeevi.rapolu@linux.intel.com,
haijun.liu@mediatek.com, amir.hanania@intel.com,
Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
dinesh.sharma@intel.com, eliot.lee@intel.com,
moises.veleta@intel.com, pierre-louis.bossart@intel.com,
muralidharan.sethuraman@intel.com,
Soumya.Prakash.Mishra@intel.com, sreehari.kancharla@intel.com
Subject: Re: [PATCH net-next v4 02/13] net: wwan: t7xx: Add control DMA interface
Date: Wed, 19 Jan 2022 11:04:18 -0800 [thread overview]
Message-ID: <e600686e-5f63-d1df-c7ae-4bc7c7a8403c@linux.intel.com> (raw)
In-Reply-To: <cb33ee41-b885-6523-199-b8a339c1a531@linux.intel.com>
On 1/19/2022 1:52 AM, Ilpo Järvinen wrote:
> On Tue, 18 Jan 2022, Martinez, Ricardo wrote:
>
>> On 1/18/2022 6:13 AM, Ilpo Järvinen wrote:
>>> On Thu, 13 Jan 2022, Ricardo Martinez wrote:
...
>>> +static bool t7xx_cldma_qs_are_active(struct t7xx_cldma_hw *hw_info)
>>> +{
>>> + unsigned int tx_active;
>>> + unsigned int rx_active;
>>> +
>>> + tx_active = t7xx_cldma_hw_queue_status(hw_info, CLDMA_ALL_Q, MTK_TX);
>>> + rx_active = t7xx_cldma_hw_queue_status(hw_info, CLDMA_ALL_Q, MTK_RX);
>>> + if (tx_active == CLDMA_INVALID_STATUS || rx_active ==
>>> CLDMA_INVALID_STATUS)
>>> These cannot ever be true because of mask in t7xx_cldma_hw_queue_status().
>> t7xx_cldma_hw_queue_status() shouldn't apply the mask for CLDMA_ALL_Q.
> I guess it shouldn't but it currently does apply 0xff (CLDMA_ALL_Q) as
> mask in that case. However, this now raises another question, if
> 0xffffffff (CLDMA_INVALID_STATUS) means status is invalid, should all
> callers both single Q and CLDMA_ALL_Q be returned/check/handle that value?
>
> Why would CLDMA_ALL_Q be special in this respect that the INVALID_STATUS
> means invalid only with it?
Reading 0xffffffff is used to detect if the PCI link was disconnected,
it is relevant in t7xx_cldma_qs_are_active() because it is a helper function
polled by t7xx_cldma_stop() to wait until the queues are not active anymore.
I think a cleaner implementation would be to use pci_device_is_present()
instead of the CLDMA_INVALID_STATUS check inside t7xx_cldma_qs_are_active()
and keep t7xx_cldma_hw_queue_status() free of that logic.
...
next prev parent reply other threads:[~2022-01-19 19:25 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-01-14 1:06 [PATCH net-next v4 00/13] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem Ricardo Martinez
2022-01-14 1:06 ` [PATCH net-next v4 01/13] list: Add list_next_entry_circular() and list_prev_entry_circular() Ricardo Martinez
2022-01-14 13:42 ` Andy Shevchenko
2022-01-14 1:06 ` [PATCH net-next v4 02/13] net: wwan: t7xx: Add control DMA interface Ricardo Martinez
2022-01-14 14:13 ` Andy Shevchenko
2022-01-18 14:13 ` Ilpo Järvinen
2022-01-18 22:22 ` Martinez, Ricardo
2022-01-19 9:52 ` Ilpo Järvinen
2022-01-19 19:04 ` Martinez, Ricardo [this message]
2022-02-11 0:25 ` Sergey Ryazanov
2022-02-16 2:24 ` Martinez, Ricardo
2022-02-10 13:50 ` Ilpo Järvinen
2022-01-14 1:06 ` [PATCH net-next v4 03/13] net: wwan: t7xx: Add core components Ricardo Martinez
2022-01-16 15:37 ` kernel test robot
2022-01-24 14:51 ` Ilpo Järvinen
2022-01-25 19:13 ` Martinez, Ricardo
2022-01-26 10:45 ` Ilpo Järvinen
2022-01-27 17:36 ` Ilpo Järvinen
2022-01-14 1:06 ` [PATCH net-next v4 04/13] net: wwan: t7xx: Add port proxy infrastructure Ricardo Martinez
2022-01-25 13:38 ` Ilpo Järvinen
2022-02-10 13:34 ` Ilpo Järvinen
2022-01-14 1:06 ` [PATCH net-next v4 05/13] net: wwan: t7xx: Add control port Ricardo Martinez
2022-01-27 10:40 ` Ilpo Järvinen
2022-01-27 14:53 ` Andy Shevchenko
2022-01-14 1:06 ` [PATCH net-next v4 06/13] net: wwan: t7xx: Add AT and MBIM WWAN ports Ricardo Martinez
2022-01-27 11:56 ` Ilpo Järvinen
2022-01-14 1:06 ` [PATCH net-next v4 07/13] net: wwan: t7xx: Data path HW layer Ricardo Martinez
2022-02-01 9:08 ` Ilpo Järvinen
2022-02-01 10:13 ` Ilpo Järvinen
2022-02-03 2:30 ` Martinez, Ricardo
2022-01-14 1:06 ` [PATCH net-next v4 08/13] net: wwan: t7xx: Add data path interface Ricardo Martinez
2022-02-03 14:23 ` Ilpo Järvinen
2022-02-08 8:19 ` Ilpo Järvinen
2022-02-16 2:17 ` Martinez, Ricardo
2022-02-16 14:36 ` Ilpo Järvinen
2022-02-22 18:40 ` Martinez, Ricardo
2022-01-14 1:06 ` [PATCH net-next v4 09/13] net: wwan: t7xx: Add WWAN network interface Ricardo Martinez
2022-02-10 10:45 ` Ilpo Järvinen
2022-01-14 1:06 ` [PATCH net-next v4 10/13] net: wwan: t7xx: Introduce power management support Ricardo Martinez
2022-02-10 10:58 ` Ilpo Järvinen
2022-01-14 1:06 ` [PATCH net-next v4 11/13] net: wwan: t7xx: Runtime PM Ricardo Martinez
2022-01-14 1:06 ` [PATCH net-next v4 12/13] net: wwan: t7xx: Device deep sleep lock/unlock Ricardo Martinez
2022-01-14 1:06 ` [PATCH net-next v4 13/13] net: wwan: t7xx: Add maintainers and documentation Ricardo Martinez
2022-01-15 14:53 ` [PATCH net-next v4 00/13] net: wwan: t7xx: PCIe driver for MediaTek M.2 modem Loic Poulain
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