remoteproc: stm32: track the coprocessor state in a backup register

Update the dedicated backup register to track the coprocessor state and
rely on that register to compute the .is_running() value (which expects
a return value of 0 -not 1- if the processor is running).

Signed-off-by: Fabien Dessenne <fabien.dessenne@st.com>
Acked-by: Patrick Delaunay <patrick.delaunay@st.com>

diff --git a/drivers/remoteproc/stm32_copro.c b/drivers/remoteproc/stm32_copro.c
index 40bba37..dcafa54 100644 (file)
--- a/drivers/remoteproc/stm32_copro.c
+++ b/drivers/remoteproc/stm32_copro.c
@@ -22,14 +22,12 @@
  * @hold_boot_regmap:  regmap for remote processor reset hold boot
  * @hold_boot_offset:  offset of the register controlling the hold boot setting
  * @hold_boot_mask:    bitmask of the register for the hold boot field
- * @is_running:                is the remote processor running
  */
 struct stm32_copro_privdata {
        struct reset_ctl reset_ctl;
        struct regmap *hold_boot_regmap;
        uint hold_boot_offset;
        uint hold_boot_mask;
-       bool is_running;
 };
 
 /**
@@ -165,11 +163,8 @@ static int stm32_copro_load(struct udevice *dev, ulong addr, ulong size)
  */
 static int stm32_copro_start(struct udevice *dev)
 {
-       struct stm32_copro_privdata *priv;
        int ret;
 
-       priv = dev_get_priv(dev);
-
        /* move hold boot from true to false start the copro */
        ret = stm32_copro_set_hold_boot(dev, false);
        if (ret)
@@ -180,7 +175,8 @@ static int stm32_copro_start(struct udevice *dev)
         * rebooting autonomously
         */
        ret = stm32_copro_set_hold_boot(dev, true);
-       priv->is_running = !ret;
+       writel(ret ? TAMP_COPRO_STATE_OFF : TAMP_COPRO_STATE_CRUN,
+              TAMP_COPRO_STATE);
        return ret;
 }
 
@@ -206,7 +202,7 @@ static int stm32_copro_reset(struct udevice *dev)
                return ret;
        }
 
-       priv->is_running = false;
+       writel(TAMP_COPRO_STATE_OFF, TAMP_COPRO_STATE);
 
        return 0;
 }
@@ -224,14 +220,11 @@ static int stm32_copro_stop(struct udevice *dev)
 /**
  * stm32_copro_is_running() - Is the STM32 remote processor running
  * @dev:       corresponding STM32 remote processor device
- * @return 1 if the remote processor is running, 0 otherwise
+ * @return 0 if the remote processor is running, 1 otherwise
  */
 static int stm32_copro_is_running(struct udevice *dev)
 {
-       struct stm32_copro_privdata *priv;
-
-       priv = dev_get_priv(dev);
-       return priv->is_running;
+       return (readl(TAMP_COPRO_STATE) == TAMP_COPRO_STATE_OFF);
 }
 
 static const struct dm_rproc_ops stm32_copro_ops = {