From: Tony Lindgren <tony@atomide.com> To: Ulf Hansson <ulf.hansson@linaro.org> Cc: Kalle Valo <kvalo@codeaurora.org>, Eyal Reizer <eyalr@ti.com>, Kishon Vijay Abraham I <kishon@ti.com>, Guy Mishol <guym@ti.com>, linux-wireless@vger.kernel.org, linux-omap <linux-omap@vger.kernel.org>, Anders Roxell <anders.roxell@linaro.org>, John Stultz <john.stultz@linaro.org>, Ricardo Salveti <rsalveti@rsalveti.net> Subject: Re: [PATCH] wlcore: Fix bringing up wlan0 again if powered down briefly Date: Tue, 18 Dec 2018 07:54:39 -0800 [thread overview] Message-ID: <20181218155439.GB6707@atomide.com> (raw) In-Reply-To: <CAPDyKFoLnNWsBfaUwqwL31J=zb0UOQjXUKi7Sj0AUsnNoC6bYg@mail.gmail.com> Hi, * Ulf Hansson <ulf.hansson@linaro.org> [181218 12:34]: > Instead, it looks like what you need, is a way to keep track of > whether the SDIO card, became power cycled or if it stayed powered on, > when "ifconfig wlan0 up" is done. In case of a power cycle, you need > to re-program the firmware, right? Yeah mostly. But we also need to ensure things do get powered down properly after ifconfig wlan0 down :) IMO after ifconfig wlan0 down returns, there should be no waiting needed. > Would it be possible to re-program the firmware, even if the SDIO card > stayed powered-on? That might help for some cases, but the problem of how to ensure the card is powered down after ifconfig wlan0 down returns still exists. > In regards to delays needed due to a capacitance. If that really is > the case, that shall be the managed by the mmc core, as it's there the > power cycle sequence is being done. As a matter of fact, you should be > able to use drivers/mmc/core/pwrseq_simple.c and extend > "power-off-delay-us" in the DTB for Hikey if that is needed. Hmm I do have a mostly done wlcore pwrseq driver here somewhere that I have not had a chance to finish again. But that's not going to work for a fix and needs updating of the related dts files too. Regards, Tony
WARNING: multiple messages have this Message-ID (diff)
From: Tony Lindgren <tony-4v6yS6AI5VpBDgjK7y7TUQ@public.gmane.org> To: Ulf Hansson <ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> Cc: Kalle Valo <kvalo-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>, Eyal Reizer <eyalr-l0cyMroinI0@public.gmane.org>, Kishon Vijay Abraham I <kishon-l0cyMroinI0@public.gmane.org>, Guy Mishol <guym-l0cyMroinI0@public.gmane.org>, linux-wireless-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-omap <linux-omap-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>, Anders Roxell <anders.roxell-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, John Stultz <john.stultz-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>, Ricardo Salveti <rsalveti-3fX5ma9fJBTk1uMJSBkQmQ@public.gmane.org> Subject: Re: [PATCH] wlcore: Fix bringing up wlan0 again if powered down briefly Date: Tue, 18 Dec 2018 07:54:39 -0800 [thread overview] Message-ID: <20181218155439.GB6707@atomide.com> (raw) In-Reply-To: <CAPDyKFoLnNWsBfaUwqwL31J=zb0UOQjXUKi7Sj0AUsnNoC6bYg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org> Hi, * Ulf Hansson <ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org> [181218 12:34]: > Instead, it looks like what you need, is a way to keep track of > whether the SDIO card, became power cycled or if it stayed powered on, > when "ifconfig wlan0 up" is done. In case of a power cycle, you need > to re-program the firmware, right? Yeah mostly. But we also need to ensure things do get powered down properly after ifconfig wlan0 down :) IMO after ifconfig wlan0 down returns, there should be no waiting needed. > Would it be possible to re-program the firmware, even if the SDIO card > stayed powered-on? That might help for some cases, but the problem of how to ensure the card is powered down after ifconfig wlan0 down returns still exists. > In regards to delays needed due to a capacitance. If that really is > the case, that shall be the managed by the mmc core, as it's there the > power cycle sequence is being done. As a matter of fact, you should be > able to use drivers/mmc/core/pwrseq_simple.c and extend > "power-off-delay-us" in the DTB for Hikey if that is needed. Hmm I do have a mostly done wlcore pwrseq driver here somewhere that I have not had a chance to finish again. But that's not going to work for a fix and needs updating of the related dts files too. Regards, Tony
next prev parent reply other threads:[~2018-12-18 15:54 UTC|newest] Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-12-17 16:42 [PATCH] wlcore: Fix bringing up wlan0 again if powered down briefly Tony Lindgren 2018-12-17 16:42 ` Tony Lindgren 2018-12-18 1:06 ` Ricardo Salveti 2018-12-18 1:06 ` Ricardo Salveti 2018-12-18 12:34 ` Ulf Hansson 2018-12-18 12:34 ` Ulf Hansson 2018-12-18 15:54 ` Tony Lindgren [this message] 2018-12-18 15:54 ` Tony Lindgren 2018-12-20 10:14 ` Ulf Hansson 2018-12-20 10:14 ` Ulf Hansson 2018-12-20 23:14 ` Tony Lindgren 2018-12-20 23:14 ` Tony Lindgren 2018-12-23 7:38 ` [EXTERNAL] " Reizer, Eyal 2018-12-23 7:38 ` Reizer, Eyal 2018-12-23 16:02 ` Tony Lindgren 2018-12-23 16:02 ` Tony Lindgren 2018-12-28 11:01 ` Ulf Hansson 2018-12-28 11:01 ` Ulf Hansson 2018-12-28 19:59 ` Tony Lindgren 2018-12-28 19:59 ` Tony Lindgren 2019-01-02 12:01 ` Ulf Hansson 2019-01-02 12:01 ` Ulf Hansson 2019-01-07 15:18 ` Tony Lindgren 2019-01-07 15:18 ` Tony Lindgren 2019-01-07 16:12 ` Kalle Valo 2019-01-07 16:12 ` Kalle Valo 2019-01-14 13:47 ` Ulf Hansson 2019-01-14 13:47 ` Ulf Hansson 2018-12-28 9:48 ` Ulf Hansson 2018-12-28 9:48 ` Ulf Hansson
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