linux-kernel - Re: [PATCH v5 05/15] USB: typec: Check for EEPROM present

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Message-ID: <ZQsGChGBq93Rh35U@primary>
Date:   Wed, 20 Sep 2023 10:47:38 -0400
From:   Abdel Alkuor <alkuor@...il.com>
To:     Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Cc:     krzysztof.kozlowski+dt@...aro.org, bryan.odonoghue@...aro.org,
        gregkh@...uxfoundation.org, robh+dt@...nel.org,
        linux-usb@...r.kernel.org, devicetree@...r.kernel.org,
        conor+dt@...nel.org, linux-kernel@...r.kernel.org,
        abdelalkuor@...tab.com
Subject: Re: [PATCH v5 05/15] USB: typec: Check for EEPROM present

On Mon, Sep 18, 2023 at 03:45:04PM +0300, Heikki Krogerus wrote:
> On Sun, Sep 17, 2023 at 11:26:29AM -0400, Abdel Alkuor wrote:
> > From: Abdel Alkuor <abdelalkuor@...tab.com>
> > 
> > When an EEPROM is present, tps25750 loads the binary configuration from
> > EEPROM. Hence, all we need to do is wait for the device to switch to APP
> > mode
> > 
> > Signed-off-by: Abdel Alkuor <abdelalkuor@...tab.com>
> > ---
> >  drivers/usb/typec/tipd/core.c     | 13 +++++++++++++
> >  drivers/usb/typec/tipd/tps6598x.h |  3 +++
> >  2 files changed, 16 insertions(+)
> > 
> > diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> > index fea139c72d6d..b3d4b2b5bf5f 100644
> > --- a/drivers/usb/typec/tipd/core.c
> > +++ b/drivers/usb/typec/tipd/core.c
> > @@ -37,6 +37,7 @@
> >  #define TPS_REG_STATUS			0x1a
> >  #define TPS_REG_SYSTEM_CONF		0x28
> >  #define TPS_REG_CTRL_CONF		0x29
> > +#define TPS_REG_BOOT_STATUS		0x2D
> >  #define TPS_REG_POWER_STATUS		0x3f
> >  #define TPS_REG_RX_IDENTITY_SOP		0x48
> >  #define TPS_REG_DATA_STATUS		0x5f
> > @@ -897,6 +898,17 @@ static int tps25750_apply_patch(struct tps6598x *tps)
> >  	int ret;
> >  	unsigned long timeout;
> >  	u8 mode;
> > +	u64 status = 0;
> > +
> > +	ret = tps6598x_block_read(tps, TPS_REG_BOOT_STATUS, &status, 5);
> > +	if (ret)
> > +		return ret;
> > +	/*
> > +	 * Nothing to be done if the configuration
> > +	 * is being loaded from EERPOM
> > +	 */
> > +	if (status & TPS25750_BOOT_STATUS_I2C_EEPROM_PRESENT)
> > +		goto wait_for_app;
> >  
> >  	ret = tps25750_start_patch_burst_mode(tps);
> >  	if (ret) {
> > @@ -908,6 +920,7 @@ static int tps25750_apply_patch(struct tps6598x *tps)
> >  	if (ret)
> >  		return ret;
> >  
> > +wait_for_app:
> >  	timeout = jiffies + msecs_to_jiffies(1000);
> >  
> >  	do {
> > diff --git a/drivers/usb/typec/tipd/tps6598x.h b/drivers/usb/typec/tipd/tps6598x.h
> > index 527857549d69..5e942c089c27 100644
> > --- a/drivers/usb/typec/tipd/tps6598x.h
> > +++ b/drivers/usb/typec/tipd/tps6598x.h
> > @@ -199,4 +199,7 @@
> >  #define TPS_DATA_STATUS_DP_SPEC_PIN_ASSIGNMENT_A    BIT(2)
> >  #define TPS_DATA_STATUS_DP_SPEC_PIN_ASSIGNMENT_B    (BIT(2) | BIT(1))
> >  
> > +/* BOOT STATUS REG*/
> > +#define TPS25750_BOOT_STATUS_I2C_EEPROM_PRESENT	BIT(3)
> 
> That's not TPS25750 specific bit, so please rename that to
> TPS_BOOT_STATUS_I2C_EEPROM_PRESENT
> 
I will fix it in v6.
> thanks,
> 
> -- 
> heikki

Thanks,
Abdel