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Message-ID: <2269063.vFx2qVVIhK@latitude-fedora>
Date: Wed, 14 Aug 2024 11:47:09 +0300
From: Alexey Charkov <alchark@...il.com>
To: Jacobe Zang <jacobe.zang@...ion.com>, robh@...nel.org, krzk+dt@...nel.org,
heiko@...ech.de, kvalo@...nel.org, davem@...emloft.net, edumazet@...gle.com,
kuba@...nel.org, pabeni@...hat.com, conor+dt@...nel.org,
linux-rockchip@...ts.infradead.org
Cc: efectn@...tonmail.com, dsimic@...jaro.org, jagan@...eble.ai,
devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
linux-rockchip@...ts.infradead.org, linux-kernel@...r.kernel.org,
arend@...adcom.com, linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
megi@....cz, duoming@....edu.cn, bhelgaas@...gle.com, minipli@...ecurity.net,
brcm80211@...ts.linux.dev, brcm80211-dev-list.pdl@...adcom.com,
nick@...das.com, Sai Krishna <saikrishnag@...vell.com>,
Arend van Spriel <arend.vanspriel@...adcom.com>
Subject:
Re: [PATCH v10 4/5] wifi: brcmfmac: Add optional lpo clock enable support
Hi Arend, Jacobe,
On Tuesday, August 13, 2024 2:57:28 PM GMT+3 Arend van Spriel wrote:
> On 8/13/2024 10:20 AM, Jacobe Zang wrote:
> > WiFi modules often require 32kHz clock to function. Add support to
> > enable the clock to PCIe driver and move "brcm,bcm4329-fmac" check
> > to the top of brcmf_of_probe. Change function prototypes from void
> > to int and add appropriate errno's for return values that will be
> > send to bus when error occurred.
>
> I was going to say it looks good to me, but....
>
> > Co-developed-by: Ondrej Jirman <megi@....cz>
> > Signed-off-by: Ondrej Jirman <megi@....cz>
> > Co-developed-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> > Signed-off-by: Arend van Spriel <arend.vanspriel@...adcom.com>
> > Reviewed-by: Sai Krishna <saikrishnag@...vell.com>
> > Signed-off-by: Jacobe Zang <jacobe.zang@...ion.com>
> > ---
> >
> > .../broadcom/brcm80211/brcmfmac/bcmsdh.c | 4 +-
> > .../broadcom/brcm80211/brcmfmac/common.c | 3 +-
> > .../wireless/broadcom/brcm80211/brcmfmac/of.c | 53 +++++++++++--------
> > .../wireless/broadcom/brcm80211/brcmfmac/of.h | 9 ++--
> > .../broadcom/brcm80211/brcmfmac/pcie.c | 3 ++
> > .../broadcom/brcm80211/brcmfmac/sdio.c | 22 +++++---
> > .../broadcom/brcm80211/brcmfmac/usb.c | 3 ++
> > 7 files changed, 61 insertions(+), 36 deletions(-)
>
> [...]
>
> > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
> > b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c index
> > e406e11481a62..f19dc7355e0e8 100644
> > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
> > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/of.c
>
> [...]
>
> > @@ -113,33 +118,39 @@ void brcmf_of_probe(struct device *dev, enum
> > brcmf_bus_type bus_type,>
> > of_node_put(root);
> >
> > }
> >
> > - if (!np || !of_device_is_compatible(np, "brcm,bcm4329-fmac"))
> > - return;
> > -
> >
> > err = brcmf_of_get_country_codes(dev, settings);
> > if (err)
> >
> > brcmf_err("failed to get OF country code map (err=%d)
\n", err);
> >
> > of_get_mac_address(np, settings->mac);
> >
> > - if (bus_type != BRCMF_BUSTYPE_SDIO)
> > - return;
> > + if (bus_type == BRCMF_BUSTYPE_SDIO) {
>
> Don't like the fact that this now has an extra indentation level and it
> offers no extra benefit. Just keep the original if-statement and return
> 0. Consequently the LPO clock code should move just before the if-statement.
> > + if (of_property_read_u32(np, "brcm,drive-strength",
&val) == 0)
> > + sdio->drive_strength = val;
> >
> > - if (of_property_read_u32(np, "brcm,drive-strength", &val) == 0)
> > - sdio->drive_strength = val;
> > + /* make sure there are interrupts defined in the node */
> > + if (!of_property_present(np, "interrupts"))
> > + return 0;
> >
> > - /* make sure there are interrupts defined in the node */
> > - if (!of_property_present(np, "interrupts"))
> > - return;
> > + irq = irq_of_parse_and_map(np, 0);
> > + if (!irq) {
> > + brcmf_err("interrupt could not be
mapped\n");
> > + return 0;
> > + }
> > + irqf = irqd_get_trigger_type(irq_get_irq_data(irq));
> > +
> > + sdio->oob_irq_supported = true;
> > + sdio->oob_irq_nr = irq;
> > + sdio->oob_irq_flags = irqf;
> > + }
> >
> > - irq = irq_of_parse_and_map(np, 0);
> > - if (!irq) {
> > - brcmf_err("interrupt could not be mapped\n");
> > - return;
> > + clk = devm_clk_get_optional_enabled(dev, "lpo");
> > + if (!IS_ERR_OR_NULL(clk)) {
> > + brcmf_dbg(INFO, "enabling 32kHz clock\n");
> > + return clk_set_rate(clk, 32768);
> > + } else {
> > + return PTR_ERR_OR_ZERO(clk);
> >
> > }
>
> Change this to:
> > + clk = devm_clk_get_optional_enabled(dev, "lpo");
> > + if (IS_ERR_OR_NULL(clk)) {
> > + return PTR_ERR_OR_ZERO(clk);
Perhaps in this case we should go for IS_ERR and PTR_ERR respectively.
devm_clk_get_optional_enabled would return NULL when the optional clock is not
found, so NULL is not an error state but serves as a dummy clock that can be
used with clk_set_rate.
This way we won't skip over the interrupts initialization below in case the
clock is absent.
> > + }
> > + brcmf_dbg(INFO, "enabling 32kHz clock\n");
> > + clk_set_rate(clk, 32768);
>
> As said above this should be moved before the if-statement:
> > - if (bus_type != BRCMF_BUSTYPE_SDIO)
> > - return 0;
> >
> > - irqf = irqd_get_trigger_type(irq_get_irq_data(irq));
> >
> > - sdio->oob_irq_supported = true;
> > - sdio->oob_irq_nr = irq;
> > - sdio->oob_irq_flags = irqf;
> > + return 0;
> >
> > }
Best regards,
Alexey
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