crypto: caam - limit AXI pipeline to a depth of 1 (33d69455) · Commits · 戴 / test

Some i.MX6 devices (imx6D, imx6Q, imx6DL, imx6S, imx6DP and imx6DQ) have an issue wherein AXI bus transactions may not occur in the correct order. This isn't a problem running single descriptors, but can be if running multiple concurrent descriptors. Reworking the CAAM driver to throttle to single requests is impractical, so this patch limits the AXI pipeline to a depth of one (from a default of 4) to preclude this situation from occurring. This patch applies to known affected platforms. Signed-off-by:

Radu Solea <radu.solea@nxp.com> Signed-off-by:

Iuliana Prodan <iuliana.prodan@nxp.com> Reviewed-by:

Horia Geantă <horia.geanta@nxp.com> Signed-off-by:

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

drivers/crypto/caam/ctrl.c

+20 −0

Original line number	Diff line number	Diff line
		@@ -468,6 +468,24 @@ static int caam_get_era(struct caam_ctrl __iomem *ctrl)
		return caam_get_era_from_hw(ctrl);
		}

		/*
		* ERRATA: imx6 devices (imx6D, imx6Q, imx6DL, imx6S, imx6DP and imx6DQ)
		* have an issue wherein AXI bus transactions may not occur in the correct
		* order. This isn't a problem running single descriptors, but can be if
		* running multiple concurrent descriptors. Reworking the driver to throttle
		* to single requests is impractical, thus the workaround is to limit the AXI
		* pipeline to a depth of 1 (from it's default of 4) to preclude this situation
		* from occurring.
		*/
		static void handle_imx6_err005766(u32 *mcr)
		{
		if (of_machine_is_compatible("fsl,imx6q") \|\|
		of_machine_is_compatible("fsl,imx6dl") \|\|
		of_machine_is_compatible("fsl,imx6qp"))
		clrsetbits_32(mcr, MCFGR_AXIPIPE_MASK,
		1 << MCFGR_AXIPIPE_SHIFT);
		}

		static const struct of_device_id caam_match[] = {
		{
		.compatible = "fsl,sec-v4.0",
		@@ -640,6 +658,8 @@ static int caam_probe(struct platform_device *pdev)
		(sizeof(dma_addr_t) == sizeof(u64) ?
		MCFGR_LONG_PTR : 0));

		handle_imx6_err005766(&ctrl->mcr);

		/*
		* Read the Compile Time paramters and SCFGR to determine
		* if Virtualization is enabled for this platform

Admin message