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mtd: qcom: write NAND_CTRL only once

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Currently NAND_CTRL register write generates error.
Register writes to operational registers should always be done
through command descriptors if BAM_MODE is already enabled.
For NAND boot, bootloader already enables BAM_MODE so read the
NAND_CTRL register value and write only if BAM_MODE is not set.

Change-Id: Iabc3e06dc7d8d8b36cdf35907217e1c4d7cc960a
Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
This commit is contained in:
Abhishek Sahu 2018-05-04 14:11:03 +05:30
parent 290e544e19
commit 3edd3544f0
1 changed files with 10 additions and 2 deletions
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12
drivers/mtd/nand/qpic_nand.c
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@ -381,8 +381,16 @@ qpic_bam_init(struct qpic_nand_init_config *config)
bam_ret = NANDC_RESULT_FAILURE;
goto qpic_nand_bam_init_error;
}
/* Enable BAM Mode in QPIC */
writel(BAM_MODE_EN, QPIC_NAND_CTRL);
/*
* Once BAM_MODE_EN bit is set then QPIC_NAND_CTRL register
* should be written with BAM instead of writel.
* Check if BAM_MODE_EN is already set by bootloader and write only
* if this bit is not set.
*/
if (!(readl(QPIC_NAND_CTRL) & BAM_MODE_EN))
writel(BAM_MODE_EN, QPIC_NAND_CTRL);
qpic_nand_bam_init_error:
return bam_ret;
}