[v2,16/17] crypto: qce: Defer probe in case interconnect is not yet initialized

Message ID 20210505213731.538612-17-bhupesh.sharma@linaro.org
State New
Headers show
Series
  • Enable Qualcomm Crypto Engine on sm8250
Related show

Commit Message

Bhupesh Sharma May 5, 2021, 9:37 p.m.
On some Qualcomm parts the qce crypto driver needs the interconnect between
the crypto block and main memory to be initialized first before the crypto
registers can be accessed. So it makes sense to defer the qce crypto driver
probing in case the interconnect driver is not yet probed.

This fixes the qce probe failure issues when both qce and
interconnect drivers are compiled as static part of the kernel.

Cc: Thara Gopinath <thara.gopinath@linaro.org>
Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: Andy Gross <agross@kernel.org>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: David S. Miller <davem@davemloft.net>
Cc: Stephen Boyd <sboyd@kernel.org>
Cc: Michael Turquette <mturquette@baylibre.com>
Cc: Vinod Koul <vkoul@kernel.org>
Cc: dmaengine@vger.kernel.org
Cc: linux-clk@vger.kernel.org
Cc: linux-crypto@vger.kernel.org
Cc: devicetree@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: bhupesh.linux@gmail.com
Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
---
 drivers/crypto/qce/core.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

Comments

Thara Gopinath May 10, 2021, 1:23 p.m. | #1
On 5/5/21 5:37 PM, Bhupesh Sharma wrote:
> On some Qualcomm parts the qce crypto driver needs the interconnect between

> the crypto block and main memory to be initialized first before the crypto

> registers can be accessed. So it makes sense to defer the qce crypto driver

> probing in case the interconnect driver is not yet probed.

> 

> This fixes the qce probe failure issues when both qce and

> interconnect drivers are compiled as static part of the kernel.

> 

> Cc: Thara Gopinath <thara.gopinath@linaro.org>

> Cc: Bjorn Andersson <bjorn.andersson@linaro.org>

> Cc: Rob Herring <robh+dt@kernel.org>

> Cc: Andy Gross <agross@kernel.org>

> Cc: Herbert Xu <herbert@gondor.apana.org.au>

> Cc: David S. Miller <davem@davemloft.net>

> Cc: Stephen Boyd <sboyd@kernel.org>

> Cc: Michael Turquette <mturquette@baylibre.com>

> Cc: Vinod Koul <vkoul@kernel.org>

> Cc: dmaengine@vger.kernel.org

> Cc: linux-clk@vger.kernel.org

> Cc: linux-crypto@vger.kernel.org

> Cc: devicetree@vger.kernel.org

> Cc: linux-kernel@vger.kernel.org

> Cc: bhupesh.linux@gmail.com

> Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>

> ---

>   drivers/crypto/qce/core.c | 14 ++++++++++++++

>   1 file changed, 14 insertions(+)

> 

> diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c

> index 3e742e9911fa..9915b184f780 100644

> --- a/drivers/crypto/qce/core.c

> +++ b/drivers/crypto/qce/core.c

> @@ -222,6 +222,20 @@ static int qce_crypto_probe(struct platform_device *pdev)

>   		return ret;

>   

>   	qce->mem_path = of_icc_get(qce->dev, "memory");

> +

> +	/* Check for NULL return path, which indicates

> +	 * interconnect API is disabled or the "interconnects"

> +	 * DT property is missing.

> +	 */

> +	if (!qce->mem_path)

> +		/* On some qcom parts, the qce crypto block needs interconnect

> +		 * paths to be configured before the registers can be accessed.

> +		 * Check here for the same.

> +		 */

> +		if (!strcmp(of_id->compatible, "qcom,ipq6018-qce") ||

> +		    !strcmp(of_id->compatible, "qcom,sdm845-qce"))

> +			return -EPROBE_DEFER;

> +


Hi Bhupesh,

You don't need this here. of_icc_get returns -EPROBE_DEFER if the 
interconnect provider is not initialized yet.

-- 
Warm Regards
Thara

>   	if (IS_ERR(qce->mem_path))

>   		return PTR_ERR(qce->mem_path);

>   

>
Rafael Reinoldes May 10, 2021, 1:58 p.m. | #2
unsubscribe
Bhupesh Sharma May 18, 2021, 2:39 p.m. | #3
Hi Thara,

On Mon, 10 May 2021 at 18:53, Thara Gopinath <thara.gopinath@linaro.org> wrote:
>
>
>
> On 5/5/21 5:37 PM, Bhupesh Sharma wrote:
> > On some Qualcomm parts the qce crypto driver needs the interconnect between
> > the crypto block and main memory to be initialized first before the crypto
> > registers can be accessed. So it makes sense to defer the qce crypto driver
> > probing in case the interconnect driver is not yet probed.
> >
> > This fixes the qce probe failure issues when both qce and
> > interconnect drivers are compiled as static part of the kernel.
> >
> > Cc: Thara Gopinath <thara.gopinath@linaro.org>
> > Cc: Bjorn Andersson <bjorn.andersson@linaro.org>
> > Cc: Rob Herring <robh+dt@kernel.org>
> > Cc: Andy Gross <agross@kernel.org>
> > Cc: Herbert Xu <herbert@gondor.apana.org.au>
> > Cc: David S. Miller <davem@davemloft.net>
> > Cc: Stephen Boyd <sboyd@kernel.org>
> > Cc: Michael Turquette <mturquette@baylibre.com>
> > Cc: Vinod Koul <vkoul@kernel.org>
> > Cc: dmaengine@vger.kernel.org
> > Cc: linux-clk@vger.kernel.org
> > Cc: linux-crypto@vger.kernel.org
> > Cc: devicetree@vger.kernel.org
> > Cc: linux-kernel@vger.kernel.org
> > Cc: bhupesh.linux@gmail.com
> > Signed-off-by: Bhupesh Sharma <bhupesh.sharma@linaro.org>
> > ---
> >   drivers/crypto/qce/core.c | 14 ++++++++++++++
> >   1 file changed, 14 insertions(+)
> >
> > diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
> > index 3e742e9911fa..9915b184f780 100644
> > --- a/drivers/crypto/qce/core.c
> > +++ b/drivers/crypto/qce/core.c
> > @@ -222,6 +222,20 @@ static int qce_crypto_probe(struct platform_device *pdev)
> >               return ret;
> >
> >       qce->mem_path = of_icc_get(qce->dev, "memory");
> > +
> > +     /* Check for NULL return path, which indicates
> > +      * interconnect API is disabled or the "interconnects"
> > +      * DT property is missing.
> > +      */
> > +     if (!qce->mem_path)
> > +             /* On some qcom parts, the qce crypto block needs interconnect
> > +              * paths to be configured before the registers can be accessed.
> > +              * Check here for the same.
> > +              */
> > +             if (!strcmp(of_id->compatible, "qcom,ipq6018-qce") ||
> > +                 !strcmp(of_id->compatible, "qcom,sdm845-qce"))
> > +                     return -EPROBE_DEFER;
> > +
>
> Hi Bhupesh,
>
> You don't need this here. of_icc_get returns -EPROBE_DEFER if the
> interconnect provider is not initialized yet.

Thanks for the review.

Yes, I finished testing all the possible combinations with qce, bam
dma and interconnect drivers compiled as modules v/s as static parts
of the kernel and we don't need this extra check for the interconnect
here. We should be fine with checking just the qce_dma_request()
return value and returning early in the qce probe() flow if no dma
channels are yet available from the bam dma driver.

I have made the changes in v3 and will post it for review shortly.

Regards,
Bhupesh

Patch

diff --git a/drivers/crypto/qce/core.c b/drivers/crypto/qce/core.c
index 3e742e9911fa..9915b184f780 100644
--- a/drivers/crypto/qce/core.c
+++ b/drivers/crypto/qce/core.c
@@ -222,6 +222,20 @@  static int qce_crypto_probe(struct platform_device *pdev)
 		return ret;
 
 	qce->mem_path = of_icc_get(qce->dev, "memory");
+
+	/* Check for NULL return path, which indicates
+	 * interconnect API is disabled or the "interconnects"
+	 * DT property is missing.
+	 */
+	if (!qce->mem_path)
+		/* On some qcom parts, the qce crypto block needs interconnect
+		 * paths to be configured before the registers can be accessed.
+		 * Check here for the same.
+		 */
+		if (!strcmp(of_id->compatible, "qcom,ipq6018-qce") ||
+		    !strcmp(of_id->compatible, "qcom,sdm845-qce"))
+			return -EPROBE_DEFER;
+
 	if (IS_ERR(qce->mem_path))
 		return PTR_ERR(qce->mem_path);