bus: ti-sysc: Fix reset status check for modules with quirks

Commit d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and
wait for softreset bit") started showing a "OCP softreset timed out"
warning on enable if the interconnect target module is not out of reset.
This caused the warning to be often triggered for i2c and hdq while the
devices are working properly.

Turns out that some interconnect target modules seem to have an unusable
reset status bits unless the module specific reset quirks are activated.

Let's just skip the reset status check for those modules as we only want
to activate the reset quirks when doing a reset, and not on enable. This
way we don't see the bogus "OCP softreset timed out" warnings during boot.

Fixes: d46f9fbec719 ("bus: ti-sysc: Use optional clocks on for enable and wait for softreset bit")
Signed-off-by: Tony Lindgren <tony@atomide.com>

diff --git a/drivers/bus/ti-sysc.c b/drivers/bus/ti-sysc.c
index efb088d..88a751c 100644 (file)
--- a/drivers/bus/ti-sysc.c
+++ b/drivers/bus/ti-sysc.c
@@ -970,9 +970,15 @@ static int sysc_enable_module(struct device *dev)
                        return error;
                }
        }
-       error = sysc_wait_softreset(ddata);
-       if (error)
-               dev_warn(ddata->dev, "OCP softreset timed out\n");
+       /*
+        * Some modules like i2c and hdq1w have unusable reset status unless
+        * the module reset quirk is enabled. Skip status check on enable.
+        */
+       if (!(ddata->cfg.quirks & SYSC_MODULE_QUIRK_ENA_RESETDONE)) {
+               error = sysc_wait_softreset(ddata);
+               if (error)
+                       dev_warn(ddata->dev, "OCP softreset timed out\n");
+       }
        if (ddata->cfg.quirks & SYSC_QUIRK_OPT_CLKS_IN_RESET)
                sysc_disable_opt_clocks(ddata);
 
@@ -1373,17 +1379,17 @@ static const struct sysc_revision_quirk sysc_revision_quirks[] = {
        SYSC_QUIRK("hdmi", 0, 0, 0x10, -ENODEV, 0x50030200, 0xffffffff,
                   SYSC_QUIRK_OPT_CLKS_NEEDED),
        SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x00000006, 0xffffffff,
-                  SYSC_MODULE_QUIRK_HDQ1W),
+                  SYSC_MODULE_QUIRK_HDQ1W | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("hdq1w", 0, 0, 0x14, 0x18, 0x0000000a, 0xffffffff,
-                  SYSC_MODULE_QUIRK_HDQ1W),
+                  SYSC_MODULE_QUIRK_HDQ1W | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000036, 0x000000ff,
-                  SYSC_MODULE_QUIRK_I2C),
+                  SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x0000003c, 0x000000ff,
-                  SYSC_MODULE_QUIRK_I2C),
+                  SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x20, 0x10, 0x00000040, 0x000000ff,
-                  SYSC_MODULE_QUIRK_I2C),
+                  SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("i2c", 0, 0, 0x10, 0x90, 0x5040000a, 0xfffff0f0,
-                  SYSC_MODULE_QUIRK_I2C),
+                  SYSC_MODULE_QUIRK_I2C | SYSC_MODULE_QUIRK_ENA_RESETDONE),
        SYSC_QUIRK("gpu", 0x50000000, 0x14, -ENODEV, -ENODEV, 0x00010201, 0xffffffff, 0),
        SYSC_QUIRK("gpu", 0x50000000, 0xfe00, 0xfe10, -ENODEV, 0x40000000 , 0xffffffff,
                   SYSC_MODULE_QUIRK_SGX),

diff --git a/include/linux/platform_data/ti-sysc.h b/include/linux/platform_data/ti-sysc.h
index c59999c..240dce5 100644 (file)
--- a/include/linux/platform_data/ti-sysc.h
+++ b/include/linux/platform_data/ti-sysc.h
@@ -50,6 +50,7 @@ struct sysc_regbits {
        s8 emufree_shift;
 };
 
+#define SYSC_MODULE_QUIRK_ENA_RESETDONE        BIT(25)
 #define SYSC_MODULE_QUIRK_PRUSS                BIT(24)
 #define SYSC_MODULE_QUIRK_DSS_RESET    BIT(23)
 #define SYSC_MODULE_QUIRK_RTC_UNLOCK   BIT(22)