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SubjectRe: [PATCH AUTOSEL 5.5 219/542] ARM: OMAP2+: use separate IOMMU pdata to fix DRA7 IPU1 boot
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Hi Sasha,

On 2/14/20 9:43 AM, Sasha Levin wrote:
> From: Suman Anna <s-anna@ti.com>
>
> [ Upstream commit 4601832f40501efc3c2fd264a5a69bd1ac17d520 ]
>
> The IPU1 MMU has been using common IOMMU pdata quirks defined and
> used by all IPU IOMMU devices on OMAP4 and beyond. Separate out the
> pdata for IPU1 MMU with the additional .set_pwrdm_constraint ops
> plugged in, so that the IPU1 power domain can be restricted to ON
> state during the boot and active period of the IPU1 remote processor.
> This eliminates the pre-conditions for the IPU1 boot issue as
> described in commit afe518400bdb ("iommu/omap: fix boot issue on
> remoteprocs with AMMU/Unicache").
>
> NOTE:
> 1. RET is not a valid target power domain state on DRA7 platforms,
> and IPU power domain is normally programmed for OFF. The IPU1
> still fails to boot though, and an unclearable l3_noc error is
> thrown currently on 4.14 kernel without this fix. This behavior
> is slightly different from previous 4.9 LTS kernel.
> 2. The fix is currently applied only to IPU1 on DRA7xx SoC, as the
> other affected processors on OMAP4/OMAP5/DRA7 are in domains
> that are not entering RET. IPU2 on DRA7 is in CORE power domain
> which is only programmed for ON power state. The fix can be easily
> scaled if these domains do hit RET in the future.
> 3. The issue was not seen on current DRA7 platforms if any of the
> DSP remote processors were booted and using one of the GPTimers
> 5, 6, 7 or 8 on previous 4.9 LTS kernel. This was due to the
> errata fix for i874 implemented in commit 1cbabcb9807e ("ARM:
> DRA7: clockdomain: Implement timer workaround for errata i874")
> which keeps the IPU1 power domain from entering RET when the
> timers are active. But the timer workaround did not make any
> difference on 4.14 kernel, and an l3_noc error was seen still
> without this fix.
>
> Signed-off-by: Suman Anna <s-anna@ti.com>
> Signed-off-by: Tony Lindgren <tony@atomide.com>
> Signed-off-by: Sasha Levin <sashal@kernel.org>

And drop this one as well, since mainline doesn't yet boot
the processors, so this is not needed for stable queue.

regards
Suman

> ---
> arch/arm/mach-omap2/pdata-quirks.c | 21 +++++++++++++++++++++
> 1 file changed, 21 insertions(+)
>
> diff --git a/arch/arm/mach-omap2/pdata-quirks.c b/arch/arm/mach-omap2/pdata-quirks.c
> index 7a79bcc02a11b..c3be1db9685cd 100644
> --- a/arch/arm/mach-omap2/pdata-quirks.c
> +++ b/arch/arm/mach-omap2/pdata-quirks.c
> @@ -43,6 +43,17 @@ struct pdata_init {
> static struct of_dev_auxdata omap_auxdata_lookup[];
> static struct twl4030_gpio_platform_data twl_gpio_auxdata;
>
> +#if IS_ENABLED(CONFIG_OMAP_IOMMU)
> +int omap_iommu_set_pwrdm_constraint(struct platform_device *pdev, bool request,
> + u8 *pwrst);
> +#else
> +static inline int omap_iommu_set_pwrdm_constraint(struct platform_device *pdev,
> + bool request, u8 *pwrst)
> +{
> + return 0;
> +}
> +#endif
> +
> #ifdef CONFIG_MACH_NOKIA_N8X0
> static void __init omap2420_n8x0_legacy_init(void)
> {
> @@ -286,6 +297,10 @@ static void __init omap5_uevm_legacy_init(void)
> #endif
>
> #ifdef CONFIG_SOC_DRA7XX
> +static struct iommu_platform_data dra7_ipu1_dsp_iommu_pdata = {
> + .set_pwrdm_constraint = omap_iommu_set_pwrdm_constraint,
> +};
> +
> static struct omap_hsmmc_platform_data dra7_hsmmc_data_mmc1;
> static struct omap_hsmmc_platform_data dra7_hsmmc_data_mmc2;
> static struct omap_hsmmc_platform_data dra7_hsmmc_data_mmc3;
> @@ -517,6 +532,12 @@ static struct of_dev_auxdata omap_auxdata_lookup[] = {
> &dra7_hsmmc_data_mmc2),
> OF_DEV_AUXDATA("ti,dra7-hsmmc", 0x480ad000, "480ad000.mmc",
> &dra7_hsmmc_data_mmc3),
> + OF_DEV_AUXDATA("ti,dra7-dsp-iommu", 0x40d01000, "40d01000.mmu",
> + &dra7_ipu1_dsp_iommu_pdata),
> + OF_DEV_AUXDATA("ti,dra7-dsp-iommu", 0x41501000, "41501000.mmu",
> + &dra7_ipu1_dsp_iommu_pdata),
> + OF_DEV_AUXDATA("ti,dra7-iommu", 0x58882000, "58882000.mmu",
> + &dra7_ipu1_dsp_iommu_pdata),
> #endif
> /* Common auxdata */
> OF_DEV_AUXDATA("ti,sysc", 0, NULL, &ti_sysc_pdata),
>

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