linux-kernel - [PATCH 3/8] bus: fsl-mc: fully resume the firmware

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Date:   Thu, 15 Jul 2021 17:07:13 +0300
From:   laurentiu.tudor@....com
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Cc:     diana.craciun@....com, ioana.ciornei@....com, jon@...id-run.com,
        leoyang.li@....com, Laurentiu Tudor <laurentiu.tudor@....com>
Subject: [PATCH 3/8] bus: fsl-mc: fully resume the firmware

From: Laurentiu Tudor <laurentiu.tudor@....com>

The MC firmware has two execution units. Resume them both, as on some
Layerscape SoCs not doing so breaks the firmware.

Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
---
 drivers/bus/fsl-mc/fsl-mc-bus.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/fsl-mc/fsl-mc-bus.c b/drivers/bus/fsl-mc/fsl-mc-bus.c
index ffd7a1ff957a..2341de6bce67 100644
--- a/drivers/bus/fsl-mc/fsl-mc-bus.c
+++ b/drivers/bus/fsl-mc/fsl-mc-bus.c
@@ -63,6 +63,7 @@ struct fsl_mc_addr_translation_range {
 
 #define FSL_MC_GCR1	0x0
 #define GCR1_P1_STOP	BIT(31)
+#define GCR1_P2_STOP	BIT(30)
 
 #define FSL_MC_FAPR	0x28
 #define MC_FAPR_PL	BIT(18)
@@ -1118,7 +1119,8 @@ static int fsl_mc_bus_probe(struct platform_device *pdev)
 		 * At this point MC should have all its SMMU setup done so make
 		 * sure it is resumed.
 		 */
-		writel(readl(mc->fsl_mc_regs + FSL_MC_GCR1) & (~GCR1_P1_STOP),
+		writel(readl(mc->fsl_mc_regs + FSL_MC_GCR1) &
+			     (~(GCR1_P1_STOP | GCR1_P2_STOP)),
 		       mc->fsl_mc_regs + FSL_MC_GCR1);
 	}
 
-- 
2.17.1