54b275c8ed
Signed-off-by: Christian Lamparter <chunkeey@gmail.com> Signed-off-by: Mathias Kresin <dev@kresin.me> Signed-off-by: John Crispin <john@phrozen.org>
94 lines
3 KiB
Diff
94 lines
3 KiB
Diff
From 25f815f66a141436df8a4c45e5d2765272aea2ac Mon Sep 17 00:00:00 2001
|
|
From: Boris Brezillon <boris.brezillon@free-electrons.com>
|
|
Date: Thu, 30 Nov 2017 18:01:30 +0100
|
|
Subject: [PATCH 5/7] mtd: nand: force drivers to explicitly send READ/PROG
|
|
commands
|
|
|
|
The core currently send the READ0 and SEQIN+PAGEPROG commands in
|
|
nand_do_read/write_ops(). This is inconsistent with
|
|
->read/write_oob[_raw]() hooks behavior which are expected to send
|
|
these commands.
|
|
|
|
There's already a flag (NAND_ECC_CUSTOM_PAGE_ACCESS) to inform the core
|
|
that a specific controller wants to send the READ/SEQIN+PAGEPROG
|
|
commands on its own, but it's an opt-in flag, and existing drivers are
|
|
unlikely to be updated to pass it.
|
|
|
|
Moreover, some controllers cannot dissociate the READ/PAGEPROG commands
|
|
from the associated data transfer and ECC engine activation, and
|
|
developers have to hack things in their ->cmdfunc() implementation to
|
|
handle such complex cases, or have to accept the perf penalty of sending
|
|
twice the same command.
|
|
To address this problem we are planning on adding a new interface which
|
|
is passed all information about a NAND operation (including the amount
|
|
of data to transfer) and replacing all calls to ->cmdfunc() to calls to
|
|
this new ->exec_op() hook. But, in order to do that, we need to have all
|
|
->cmdfunc() calls placed near their associated ->read/write_buf/byte()
|
|
calls.
|
|
|
|
Modify the core and relevant drivers to make NAND_ECC_CUSTOM_PAGE_ACCESS
|
|
the default case, and remove this flag.
|
|
|
|
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
|
|
[miquel.raynal@free-electrons.com: tested, fixed and rebased on nand/next]
|
|
Signed-off-by: Miquel Raynal <miquel.raynal@free-electrons.com>
|
|
Acked-by: Masahiro Yamada <yamada.masahiro@socionext.com>
|
|
---
|
|
drivers/mtd/nand/qcom_nandc.c | 11 +++++++++++
|
|
1 file changed, 11 insertions(+)
|
|
|
|
--- a/drivers/mtd/nand/qcom_nandc.c
|
|
+++ b/drivers/mtd/nand/qcom_nandc.c
|
|
@@ -1725,6 +1725,7 @@ static int qcom_nandc_read_page(struct m
|
|
u8 *data_buf, *oob_buf = NULL;
|
|
int ret;
|
|
|
|
+ nand_read_page_op(chip, page, 0, NULL, 0);
|
|
data_buf = buf;
|
|
oob_buf = oob_required ? chip->oob_poi : NULL;
|
|
|
|
@@ -1750,6 +1751,7 @@ static int qcom_nandc_read_page_raw(stru
|
|
int i, ret;
|
|
int read_loc;
|
|
|
|
+ nand_read_page_op(chip, page, 0, NULL, 0);
|
|
data_buf = buf;
|
|
oob_buf = chip->oob_poi;
|
|
|
|
@@ -1850,6 +1852,8 @@ static int qcom_nandc_write_page(struct
|
|
u8 *data_buf, *oob_buf;
|
|
int i, ret;
|
|
|
|
+ nand_prog_page_begin_op(chip, page, 0, NULL, 0);
|
|
+
|
|
clear_read_regs(nandc);
|
|
clear_bam_transaction(nandc);
|
|
|
|
@@ -1902,6 +1906,9 @@ static int qcom_nandc_write_page(struct
|
|
|
|
free_descs(nandc);
|
|
|
|
+ if (!ret)
|
|
+ ret = nand_prog_page_end_op(chip);
|
|
+
|
|
return ret;
|
|
}
|
|
|
|
@@ -1916,6 +1923,7 @@ static int qcom_nandc_write_page_raw(str
|
|
u8 *data_buf, *oob_buf;
|
|
int i, ret;
|
|
|
|
+ nand_prog_page_begin_op(chip, page, 0, NULL, 0);
|
|
clear_read_regs(nandc);
|
|
clear_bam_transaction(nandc);
|
|
|
|
@@ -1970,6 +1978,9 @@ static int qcom_nandc_write_page_raw(str
|
|
|
|
free_descs(nandc);
|
|
|
|
+ if (!ret)
|
|
+ ret = nand_prog_page_end_op(chip);
|
|
+
|
|
return ret;
|
|
}
|
|
|