mtd: rawnand: gpmi: Fix suspend/resume problem

On system resume, the gpmi clock must be enabled before accessing gpmi
block.  Without this, resume causes something like

[  661.348790] gpmi_reset_block(5cbb0f7e): module reset timeout
[  661.348889] gpmi-nand 1806000.gpmi-nand: Error setting GPMI : -110
[  661.348928] PM: dpm_run_callback(): platform_pm_resume+0x0/0x44 returns -110
[  661.348961] PM: Device 1806000.gpmi-nand failed to resume: error -110

Fixes: ef347c0cfd61 ("mtd: rawnand: gpmi: Implement exec_op")
Cc: stable@vger.kernel.org
Signed-off-by: Esben Haabendal <esben@geanix.com>
Acked-by: Han Xu <han.xu@nxp.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>

diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
index 334fe31..879df84 100644 (file)
--- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
+++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
@@ -148,6 +148,10 @@ static int gpmi_init(struct gpmi_nand_data *this)
        struct resources *r = &this->resources;
        int ret;
 
+       ret = pm_runtime_get_sync(this->dev);
+       if (ret < 0)
+               return ret;
+
        ret = gpmi_reset_block(r->gpmi_regs, false);
        if (ret)
                goto err_out;
@@ -179,8 +183,9 @@ static int gpmi_init(struct gpmi_nand_data *this)
         */
        writel(BM_GPMI_CTRL1_DECOUPLE_CS, r->gpmi_regs + HW_GPMI_CTRL1_SET);
 
-       return 0;
 err_out:
+       pm_runtime_mark_last_busy(this->dev);
+       pm_runtime_put_autosuspend(this->dev);
        return ret;
 }