-----Original Message----- From: Z.q. Hou zhiqiang.hou@nxp.com Sent: Friday, March 5, 2021 12:33 PM To: u-boot@lists.denx.de Cc: sjg@chromium.org; rayagonda.kokatanur@broadcom.com; Priyanka Jain priyanka.jain@nxp.com; Z.q. Hou zhiqiang.hou@nxp.com Subject: [PATCHv3] arm64: gic-v3-its: Clear the Pending table before enabling LPIs

From: Hou Zhiqiang Zhiqiang.Hou@nxp.com

The GICv3 RM requires "The first 1KB of memory for the LPI Pending tables must contain only zeros on initial allocation, and this must be visible to the Redistributors, or else the effect is UNPREDICTABLE".

And as the following statement, we here clear the whole Pending tables instead of the first 1KB. "An LPI Pending table that contains only zeros, including in the first 1KB, indicates that there are no pending LPIs. The first 1KB of the LPI Pending table is IMPLEMENTATION DEFINED. However, if the first 1KB of the LPI Pending table and the rest of the table contain only zeros, this must indicate that there are no pending LPIs."

And there isn't any pending LPI under U-Boot, so it's unnecessary to load the contents of the Pending table during the enablement, then set the GICR_PENDBASER.PTZ flag.

Signed-off-by: Hou Zhiqiang Zhiqiang.Hou@nxp.com

V3:

• Fix a mistake code delete in v2.

arch/arm/lib/gic-v3-its.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm/lib/gic-v3-its.c b/arch/arm/lib/gic-v3-its.c index f5a921b3d1..2d3fdb600e 100644 --- a/arch/arm/lib/gic-v3-its.c +++ b/arch/arm/lib/gic-v3-its.c @@ -3,6 +3,7 @@

• Copyright 2019 Broadcom.

*/ #include <common.h> +#include <cpu_func.h> #include <dm.h> #include <regmap.h> #include <syscon.h> @@ -108,6 +109,8 @@ int gic_lpi_tables_init(void) int i; u64 redist_lpi_base; u64 pend_base;

• ulong pend_tab_total_sz;

• void *pend_tab_va;

  if (gic_v3_its_get_gic_addr(&priv)) return -EINVAL;

@@ -161,6 +164,12 @@ int gic_lpi_tables_init(void) }

redist_lpi_base = priv.lpi_base + LPI_PROPBASE_SZ;

• pend_tab_total_sz = priv.num_redist * LPI_PENDBASE_SZ;

• pend_tab_va = map_physmem(redist_lpi_base, pend_tab_total_sz,

• 		  MAP_NOCACHE);
  

• memset(pend_tab_va, 0, pend_tab_total_sz);

• flush_cache((ulong)pend_tab_va, pend_tab_total_sz);

• unmap_physmem(pend_tab_va, MAP_NOCACHE);

  pend_base = priv.gicr_base + GICR_PENDBASER; for (i = 0; i < priv.num_redist; i++) { @@ -168,7 +177,8 @@ int

gic_lpi_tables_init(void)

val = ((redist_lpi_base + (i * LPI_PENDBASE_SZ)) |
	GICR_PENDBASER_INNERSHAREABLE |

• 	GICR_PENDBASER_RAWAWB);
  

• 	GICR_PENDBASER_RAWAWB |
  

• 	GICR_PENDBASER_PTZ);
  
  

  writeq(val, (uintptr_t)(pend_base + offset)); tmp = readq((uintptr_t)(pend_base + offset));

-- 2.17.1

Reviewed-by: Priyanka Jain priyanka.jain@nxp.com

Tom,

Kindly help to merge this patch. This is required to fix boot issue on many of NXP fsl-qoriq platforms like lx2160ardb.

Thanks Priyanka