Patch "bus: ti-sysc: Fix SYSC_QUIRK_SWSUP_SIDLE_ACT handling for uart wake-up" has been added to the 5.15-stable tree

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This is a note to let you know that I've just added the patch titled

    bus: ti-sysc: Fix SYSC_QUIRK_SWSUP_SIDLE_ACT handling for uart wake-up

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     bus-ti-sysc-fix-sysc_quirk_swsup_sidle_act-handling-.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 7ce13a962b979700d0065a8ef490843e93827f2c
Author: Tony Lindgren <tony@xxxxxxxxxxx>
Date:   Thu Sep 7 08:53:28 2023 +0300

    bus: ti-sysc: Fix SYSC_QUIRK_SWSUP_SIDLE_ACT handling for uart wake-up
    
    [ Upstream commit e5deb8f76e64d94ccef715e75ebafffd0c312d80 ]
    
    The uarts should be tagged with SYSC_QUIRK_SWSUP_SIDLE instead of
    SYSC_QUIRK_SWSUP_SIDLE_ACT. The difference is that SYSC_QUIRK_SWSUP_SIDLE
    is used to force idle target modules rather than block idle during usage.
    
    The SYSC_QUIRK_SWSUP_SIDLE_ACT should disable autoidle and wake-up when
    a target module is active, and configure autoidle and wake-up when a
    target module is inactive. We are missing configuring the target module
    on sysc_disable_module(), and missing toggling of the wake-up bit.
    
    Let's fix the issue to allow uart wake-up to work.
    
    Fixes: fb685f1c190e ("bus: ti-sysc: Handle swsup idle mode quirks")
    Tested-by: Dhruva Gole <d-gole@xxxxxx>
    Tested-by: Kevin Hilman <khilman@xxxxxxxxxxxx>
    Signed-off-by: Tony Lindgren <tony@xxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index 8b0fe4b7b9c19..0a159989c899a 100644
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -1118,6 +1118,11 @@ static int sysc_enable_module(struct device *dev)
 	if (ddata->cfg.quirks & (SYSC_QUIRK_SWSUP_SIDLE |
 				 SYSC_QUIRK_SWSUP_SIDLE_ACT)) {
 		best_mode = SYSC_IDLE_NO;
+
+		/* Clear WAKEUP */
+		if (regbits->enwkup_shift >= 0 &&
+		    ddata->cfg.sysc_val & BIT(regbits->enwkup_shift))
+			reg &= ~BIT(regbits->enwkup_shift);
 	} else {
 		best_mode = fls(ddata->cfg.sidlemodes) - 1;
 		if (best_mode > SYSC_IDLE_MASK) {
@@ -1238,6 +1243,13 @@ static int sysc_disable_module(struct device *dev)
 		}
 	}
 
+	if (ddata->cfg.quirks & SYSC_QUIRK_SWSUP_SIDLE_ACT) {
+		/* Set WAKEUP */
+		if (regbits->enwkup_shift >= 0 &&
+		    ddata->cfg.sysc_val & BIT(regbits->enwkup_shift))
+			reg |= BIT(regbits->enwkup_shift);
+	}
+
 	reg &= ~(SYSC_IDLE_MASK << regbits->sidle_shift);
 	reg |= best_mode << regbits->sidle_shift;
 	if (regbits->autoidle_shift >= 0 &&
@@ -1497,16 +1509,16 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
 	SYSC_QUIRK("sham", 0, 0x100, 0x110, 0x114, 0x40000c03, 0xffffffff,
 		   SYSC_QUIRK_LEGACY_IDLE),
 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000046, 0xffffffff,
-		   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
+		   SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x00000052, 0xffffffff,
-		   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
+		   SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
 	/* Uarts on omap4 and later */
 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x50411e03, 0xffff00ff,
-		   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
+		   SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47422e03, 0xffffffff,
-		   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
+		   SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
 	SYSC_QUIRK("uart", 0, 0x50, 0x54, 0x58, 0x47424e03, 0xffffffff,
-		   SYSC_QUIRK_SWSUP_SIDLE | SYSC_QUIRK_LEGACY_IDLE),
+		   SYSC_QUIRK_SWSUP_SIDLE_ACT | SYSC_QUIRK_LEGACY_IDLE),
 
 	/* Quirks that need to be set based on the module address */
 	SYSC_QUIRK("mcpdm", 0x40132000, 0, 0x10, -ENODEV, 0x50000800, 0xffffffff,



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