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From 25f815f66a141436df8a4c45e5d2765272aea2ac Mon Sep 17 00:00:00 2001
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From: Boris Brezillon <boris.brezillon@free-electrons.com>
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Date: Thu, 30 Nov 2017 18:01:30 +0100
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Subject: [PATCH 5/7] mtd: nand: force drivers to explicitly send READ/PROG
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commands
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The core currently send the READ0 and SEQIN+PAGEPROG commands in
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nand_do_read/write_ops(). This is inconsistent with
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->read/write_oob[_raw]() hooks behavior which are expected to send
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these commands.
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There's already a flag (NAND_ECC_CUSTOM_PAGE_ACCESS) to inform the core
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that a specific controller wants to send the READ/SEQIN+PAGEPROG
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commands on its own, but it's an opt-in flag, and existing drivers are
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unlikely to be updated to pass it.
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Moreover, some controllers cannot dissociate the READ/PAGEPROG commands
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from the associated data transfer and ECC engine activation, and
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developers have to hack things in their ->cmdfunc() implementation to
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handle such complex cases, or have to accept the perf penalty of sending
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twice the same command.
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To address this problem we are planning on adding a new interface which
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is passed all information about a NAND operation (including the amount
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of data to transfer) and replacing all calls to ->cmdfunc() to calls to
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this new ->exec_op() hook. But, in order to do that, we need to have all
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->cmdfunc() calls placed near their associated ->read/write_buf/byte()
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calls.
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Modify the core and relevant drivers to make NAND_ECC_CUSTOM_PAGE_ACCESS
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the default case, and remove this flag.
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Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
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[miquel.raynal@free-electrons.com: tested, fixed and rebased on nand/next]
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Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
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Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
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---
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drivers/mtd/nand/qcom_nandc.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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--- a/drivers/mtd/nand/qcom_nandc.c
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+++ b/drivers/mtd/nand/qcom_nandc.c
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@@ -1727,6 +1727,7 @@ static int qcom_nandc_read_page(struct m
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u8 *data_buf, *oob_buf = NULL;
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int ret;
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+ nand_read_page_op(chip, page, 0, NULL, 0);
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data_buf = buf;
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oob_buf = oob_required ? chip->oob_poi : NULL;
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@@ -1752,6 +1753,7 @@ static int qcom_nandc_read_page_raw(stru
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int i, ret;
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int read_loc;
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+ nand_read_page_op(chip, page, 0, NULL, 0);
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data_buf = buf;
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oob_buf = chip->oob_poi;
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@@ -1852,6 +1854,8 @@ static int qcom_nandc_write_page(struct
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u8 *data_buf, *oob_buf;
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int i, ret;
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+ nand_prog_page_begin_op(chip, page, 0, NULL, 0);
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+
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clear_read_regs(nandc);
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clear_bam_transaction(nandc);
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@@ -1904,6 +1908,9 @@ static int qcom_nandc_write_page(struct
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free_descs(nandc);
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+ if (!ret)
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+ ret = nand_prog_page_end_op(chip);
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+
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return ret;
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}
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@@ -1918,6 +1925,7 @@ static int qcom_nandc_write_page_raw(str
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u8 *data_buf, *oob_buf;
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int i, ret;
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+ nand_prog_page_begin_op(chip, page, 0, NULL, 0);
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clear_read_regs(nandc);
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clear_bam_transaction(nandc);
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@@ -1972,6 +1980,9 @@ static int qcom_nandc_write_page_raw(str
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free_descs(nandc);
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+ if (!ret)
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+ ret = nand_prog_page_end_op(chip);
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+
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return ret;
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}
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