mtd: rawnand: qcom: Fix clock sequencing in qcom_nandc_probe()

commit 5c23b3f965bc9ee696bf2ed4bdc54d339dd9a455 upstream.

Interacting with a NAND chip on an IPQ6018 I found that the qcomsmem NAND
partition parser was returning -EPROBE_DEFER waiting for the main smem
driver to load.

This caused the board to reset. Playing about with the probe() function
shows that the problem lies in the core clock being switched off before the
nandc_unalloc() routine has completed.

If we look at how qcom_nandc_remove() tears down allocated resources we see
the expected order is

qcom_nandc_unalloc(nandc);

clk_disable_unprepare(nandc->aon_clk);
clk_disable_unprepare(nandc->core_clk);

dma_unmap_resource(&pdev->dev, nandc->base_dma, resource_size(res),
		   DMA_BIDIRECTIONAL, 0);

Tweaking probe() to both bring up and tear-down in that order removes the
reset if we end up deferring elsewhere.

Fixes: c76b78d8ec05 ("mtd: nand: Qualcomm NAND controller driver")
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220103030316.58301-2-bryan.odonoghue@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c
index 148c7a16f3188ce03f898217a95c7fd73de82a59..c64b408f080a9ca637e2fcde27b8fa4b10839ff8 100644 (file)
--- a/drivers/mtd/nand/raw/qcom_nandc.c
+++ b/drivers/mtd/nand/raw/qcom_nandc.c
@@ -10,7 +10,6 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */
-
 #include <linux/clk.h>
 #include <linux/slab.h>
 #include <linux/bitops.h>
@@ -2959,10 +2958,6 @@ static int qcom_nandc_probe(struct platform_device *pdev)
        if (!nandc->base_dma)
                return -ENXIO;
 
-       ret = qcom_nandc_alloc(nandc);
-       if (ret)
-               goto err_nandc_alloc;
-
        ret = clk_prepare_enable(nandc->core_clk);
        if (ret)
                goto err_core_clk;
@@ -2971,6 +2966,10 @@ static int qcom_nandc_probe(struct platform_device *pdev)
        if (ret)
                goto err_aon_clk;
 
+       ret = qcom_nandc_alloc(nandc);
+       if (ret)
+               goto err_nandc_alloc;
+
        ret = qcom_nandc_setup(nandc);
        if (ret)
                goto err_setup;
@@ -2982,15 +2981,14 @@ static int qcom_nandc_probe(struct platform_device *pdev)
        return 0;
 
 err_setup:
+       qcom_nandc_unalloc(nandc);
+err_nandc_alloc:
        clk_disable_unprepare(nandc->aon_clk);
 err_aon_clk:
        clk_disable_unprepare(nandc->core_clk);
 err_core_clk:
-       qcom_nandc_unalloc(nandc);
-err_nandc_alloc:
        dma_unmap_resource(dev, res->start, resource_size(res),
                           DMA_BIDIRECTIONAL, 0);
-
        return ret;
 }