6.12-stable review patch. If anyone has any objections, please let me know.
------------------
From: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
[ Upstream commit 3fbe3fe28764455e4fc3578afb9765f46f9ce93d ]
The checks for vrtual registers in the cy8c95x0_readable_register()
and cy8c95x0_writeable_register() are not aligned and broken.
Fix that by explicitly avoiding reserved registers to be accessed.
Fixes: 71e4001a0455 ("pinctrl: pinctrl-cy8c95x0: Fix regcache")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/20250203131506.3318201-3-andriy.shevchenko@xxxxxxxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/pinctrl/pinctrl-cy8c95x0.c | 16 ++++++++++------
1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/pinctrl/pinctrl-cy8c95x0.c b/drivers/pinctrl/pinctrl-cy8c95x0.c
index 5096ccdd459ea..05224808d92be 100644
--- a/drivers/pinctrl/pinctrl-cy8c95x0.c
+++ b/drivers/pinctrl/pinctrl-cy8c95x0.c
@@ -330,14 +330,14 @@ static int cypress_get_pin_mask(struct cy8c95x0_pinctrl *chip, unsigned int pin)
static bool cy8c95x0_readable_register(struct device *dev, unsigned int reg)
{
/*
- * Only 12 registers are present per port (see Table 6 in the
- * datasheet).
+ * Only 12 registers are present per port (see Table 6 in the datasheet).
*/
- if (reg >= CY8C95X0_VIRTUAL && (reg % MUXED_STRIDE) < 12)
- return true;
+ if (reg >= CY8C95X0_VIRTUAL && (reg % MUXED_STRIDE) >= 12)
+ return false;
switch (reg) {
case 0x24 ... 0x27:
+ case 0x31 ... 0x3f:
return false;
default:
return true;
@@ -346,8 +346,11 @@ static bool cy8c95x0_readable_register(struct device *dev, unsigned int reg)
static bool cy8c95x0_writeable_register(struct device *dev, unsigned int reg)
{
- if (reg >= CY8C95X0_VIRTUAL)
- return true;
+ /*
+ * Only 12 registers are present per port (see Table 6 in the datasheet).
+ */
+ if (reg >= CY8C95X0_VIRTUAL && (reg % MUXED_STRIDE) >= 12)
+ return false;
switch (reg) {
case CY8C95X0_INPUT_(0) ... CY8C95X0_INPUT_(7):
@@ -355,6 +358,7 @@ static bool cy8c95x0_writeable_register(struct device *dev, unsigned int reg)
case CY8C95X0_DEVID:
return false;
case 0x24 ... 0x27:
+ case 0x31 ... 0x3f:
return false;
default:
return true;
--
2.39.5
