linux-kernel - [PATCH] soc: ti: omap-prm: Fix reboot issue with invalid pcie reset map for dra7

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Message-Id: <20210210083751.19202-1-tony@atomide.com>
Date:   Wed, 10 Feb 2021 10:37:51 +0200
From:   Tony Lindgren <tony@...mide.com>
To:     linux-omap@...r.kernel.org
Cc:     Dave Gerlach <d-gerlach@...com>, Faiz Abbas <faiz_abbas@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        Suman Anna <s-anna@...com>, Tero Kristo <kristo@...nel.org>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Kishon Vijay Abraham I <kishon@...com>,
        Yongqin Liu <yongqin.liu@...aro.org>
Subject: [PATCH] soc: ti: omap-prm: Fix reboot issue with invalid pcie reset map for dra7

Yongqin Liu <yongqin.liu@...aro.org> reported an issue where reboot hangs
on beagleboard-x15. This started happening after commit 7078a5ba7a58
("soc: ti: omap-prm: Fix boot time errors for rst_map_012 bits 0 and 1").

We now assert any 012 type resets on init to prevent unconfigured
accelerator MMUs getting enabled on init depending on the bootloader or
kexec configured state.

Turns out that we now also wrongly assert dra7 l3init domain PCIe reset
bits causing a hang during reboot. Let's fix the l3init reset bits to
use a 01 map instead of 012 map. There are only two rstctrl bits and not
three. This is documented in TRM "Table 3-1647. RM_PCIESS_RSTCTRL".

Fixes: 5a68c87afde0 ("soc: ti: omap-prm: dra7: add genpd support for remaining PRM instances")
Fixes: 7078a5ba7a58 ("soc: ti: omap-prm: Fix boot time errors for rst_map_012 bits 0 and 1")
Cc: Kishon Vijay Abraham I <kishon@...com>
Reported-by: Yongqin Liu <yongqin.liu@...aro.org>
Signed-off-by: Tony Lindgren <tony@...mide.com>
---
 drivers/soc/ti/omap_prm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/soc/ti/omap_prm.c b/drivers/soc/ti/omap_prm.c
--- a/drivers/soc/ti/omap_prm.c
+++ b/drivers/soc/ti/omap_prm.c
@@ -332,7 +332,7 @@ static const struct omap_prm_data dra7_prm_data[] = {
 	{
 		.name = "l3init", .base = 0x4ae07300,
 		.pwrstctrl = 0x0, .pwrstst = 0x4, .dmap = &omap_prm_alwon,
-		.rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_012,
+		.rstctrl = 0x10, .rstst = 0x14, .rstmap = rst_map_01,
 		.clkdm_name = "pcie"
 	},
 	{
-- 
2.30.1