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| author | Md Sadre Alam <quic_mdalam@quicinc.com> | 2025-04-10 13:00:18 +0300 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2025-04-29 12:05:35 +0300 |
| commit | 47bddabbf69da50999ec68be92b58356c687e1d6 (patch) | |
| tree | 23d87f554575529dc2144565083a77f667236d7a | |
| parent | ee000969f28bf579d3772bf7c0ae8aff86586e20 (diff) | |
| download | linux-47bddabbf69da50999ec68be92b58356c687e1d6.tar.xz | |
mtd: rawnand: qcom: Fix last codeword read in qcom_param_page_type_exec()
For QPIC V2 onwards there is a separate register to read
last code word "QPIC_NAND_READ_LOCATION_LAST_CW_n".
qcom_param_page_type_exec() is used to read only one code word
If it configures the number of code words to 1 in QPIC_NAND_DEV0_CFG0
register then QPIC controller thinks its reading the last code word,
since we are having separate register to read the last code word,
we have to configure "QPIC_NAND_READ_LOCATION_LAST_CW_n" register
to fetch data from QPIC buffer to system memory.
Without this change page read was failing with timeout error
/ # hexdump -C /dev/mtd1
[ 129.206113] qcom-nandc 1cc8000.nand-controller: failure to read page/oob
hexdump: /dev/mtd1: Connection timed out
This issue only seen on SDX targets since SDX target used QPICv2. But
same working on IPQ targets since IPQ used QPICv1.
Cc: stable@vger.kernel.org
Fixes: 89550beb098e ("mtd: rawnand: qcom: Implement exec_op()")
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Tested-by: Lakshmi Sowjanya D <quic_laksd@quicinc.com>
Signed-off-by: Md Sadre Alam <quic_mdalam@quicinc.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
| -rw-r--r-- | drivers/mtd/nand/raw/qcom_nandc.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/drivers/mtd/nand/raw/qcom_nandc.c b/drivers/mtd/nand/raw/qcom_nandc.c index ef2dd158ca34..a73bb154353f 100644 --- a/drivers/mtd/nand/raw/qcom_nandc.c +++ b/drivers/mtd/nand/raw/qcom_nandc.c @@ -1863,7 +1863,12 @@ static int qcom_param_page_type_exec(struct nand_chip *chip, const struct nand_ const struct nand_op_instr *instr = NULL; unsigned int op_id = 0; unsigned int len = 0; - int ret; + int ret, reg_base; + + reg_base = NAND_READ_LOCATION_0; + + if (nandc->props->qpic_version2) + reg_base = NAND_READ_LOCATION_LAST_CW_0; ret = qcom_parse_instructions(chip, subop, &q_op); if (ret) @@ -1915,7 +1920,10 @@ static int qcom_param_page_type_exec(struct nand_chip *chip, const struct nand_ op_id = q_op.data_instr_idx; len = nand_subop_get_data_len(subop, op_id); - nandc_set_read_loc(chip, 0, 0, 0, len, 1); + if (nandc->props->qpic_version2) + nandc_set_read_loc_last(chip, reg_base, 0, len, 1); + else + nandc_set_read_loc_first(chip, reg_base, 0, len, 1); if (!nandc->props->qpic_version2) { qcom_write_reg_dma(nandc, &nandc->regs->vld, NAND_DEV_CMD_VLD, 1, 0); |