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SubjectRE: [Patch V8 2/3] tpm_tis-spi: Add hardware wait polling
Date
> -----Original Message-----
> From: Jarkko Sakkinen <jarkko@kernel.org>
> Sent: 19 March 2023 19:13
> To: Krishna Yarlagadda <kyarlagadda@nvidia.com>
> Cc: robh+dt@kernel.org; broonie@kernel.org; peterhuewe@gmx.de;
> jgg@ziepe.ca; krzysztof.kozlowski+dt@linaro.org; linux-spi@vger.kernel.org;
> linux-tegra@vger.kernel.org; linux-integrity@vger.kernel.org; linux-
> kernel@vger.kernel.org; thierry.reding@gmail.com; Jonathan Hunter
> <jonathanh@nvidia.com>; Sowjanya Komatineni
> <skomatineni@nvidia.com>; Laxman Dewangan <ldewangan@nvidia.com>
> Subject: Re: [Patch V8 2/3] tpm_tis-spi: Add hardware wait polling
>
> External email: Use caution opening links or attachments
>
>
> On Wed, Mar 15, 2023 at 03:47:33PM +0000, Krishna Yarlagadda wrote:
> >
> > > -----Original Message-----
> > > From: Jarkko Sakkinen <jarkko@kernel.org>
> > > Sent: 12 March 2023 03:19
> > > To: Krishna Yarlagadda <kyarlagadda@nvidia.com>; robh+dt@kernel.org;
> > > broonie@kernel.org; peterhuewe@gmx.de; jgg@ziepe.ca;
> > > krzysztof.kozlowski+dt@linaro.org; linux-spi@vger.kernel.org; linux-
> > > tegra@vger.kernel.org; linux-integrity@vger.kernel.org; linux-
> > > kernel@vger.kernel.org
> > > Cc: thierry.reding@gmail.com; Jonathan Hunter
> <jonathanh@nvidia.com>;
> > > Sowjanya Komatineni <skomatineni@nvidia.com>; Laxman Dewangan
> > > <ldewangan@nvidia.com>
> > > Subject: Re: [Patch V8 2/3] tpm_tis-spi: Add hardware wait polling
> > >
> > > External email: Use caution opening links or attachments
> > >
> > >
> > > On Thu, 2023-03-02 at 09:48 +0530, Krishna Yarlagadda wrote:
> > > > +int tpm_tis_spi_transfer(struct tpm_tis_data *data, u32 addr, u16
> > > > len,
> > > > + u8 *in, const u8 *out)
> > > > +{
> > > > + struct tpm_tis_spi_phy *phy = to_tpm_tis_spi_phy(data);
> > > > + struct spi_controller *ctlr = phy->spi_device->controller;
> > > > +
> > > > + /*
> > > > + * TPM flow control over SPI requires full duplex support.
> > > > + * Send entire message to a half duplex controller to handle
> > > > + * wait polling in controller.
> > > > + * Set TPM HW flow control flag..
> > > > + */
> > > > + if (ctlr->flags & SPI_CONTROLLER_HALF_DUPLEX)
> > > > + return tpm_tis_spi_hw_flow_transfer(data, addr, len,
> > > > in,
> > > > + out);
> > > > + else
> > > > + return tpm_tis_spi_sw_flow_transfer(data, addr, len,
> > > > in,
> > > > + out);
> > > > +}
> > > > +
> > >
> > > Based on the condition, better names would be
> > Though condition is based on half duplex, functions are implementing
> > HW or SW flow of the transfer.
>
> Both are hardwaw flows in the sense that you are controlling a piece of
> hardware.
>
> BR, Jarkko
Yes. I will push new version with naming suggested.
KY

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