linux-kernel - Re: [PATCH SPI for-next] spi: microchip: pci1xxxx: Fix minor bugs in spi-pci1xxxx driver

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Date:   Tue, 28 Mar 2023 14:43:50 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Tharun Kumar P <tharunkumar.pasumarthi@...rochip.com>
Cc:     linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH SPI for-next] spi: microchip: pci1xxxx: Fix minor bugs in
 spi-pci1xxxx driver

On Tue, Mar 28, 2023 at 11:12:12AM +0530, Tharun Kumar P wrote:
> Following bugs are fixed in this patch:
> 1. pci1xxxx_spi_resume API masks SPI interrupt bit which prohibits
> firing of interrupt to the host at the end of the transaction after
> suspend-resume. This patch unmasks this bit at resume.
> 2. In pci1xxxx_spi_transfer_one API, length of SPI transaction gets
> cleared by unmasking length field. Set length of transaction after
> unmasking length field.
> 3. Remove support for disabling chip select as hardware does not support
> the same.

As covered in submitting-patches.rst you should send one patch per
change, this makes things much easier to review.

>  drivers/spi/spi-pci1xxxx.c | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)

The subject says this is a patch for the microchip driver...

>  	/* Set the DEV_SEL bits of the SPI_MST_CTL_REG */
>  	regval = readl(par->reg_base + SPI_MST_CTL_REG_OFFSET(p->hw_inst));
> -	if (enable) {
> +	if (!enable) {
>  		regval &= ~SPI_MST_CTL_DEVSEL_MASK;
>  		regval |= (spi_get_chipselect(spi, 0) << 25);
>  		writel(regval,
>  		       par->reg_base + SPI_MST_CTL_REG_OFFSET(p->hw_inst));
> -	} else {
> -		regval &= ~(spi_get_chipselect(spi, 0) << 25);
> -		writel(regval,
> -		       par->reg_base + SPI_MST_CTL_REG_OFFSET(p->hw_inst));
> -

I am unclear how chip select will ever be asserted with this change?
Now the value is only written if we are disabling.

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