From: Xiaolei Li <xiaolei.li@mediatek.com>
To: <miquel.raynal@bootlin.com>, <richard@nod.at>
Cc: linux-mediatek@lists.infradead.org, xiaolei.li@mediatek.com,
linux-mtd@lists.infradead.org, srv_heupstream@mediatek.com
Subject: [PATCH 5/5] mtd: rawnand: mtk: Setup empty page threshold correctly
Date: Mon, 29 Apr 2019 14:38:34 +0800 [thread overview]
Message-ID: <20190429063834.45967-6-xiaolei.li@mediatek.com> (raw)
In-Reply-To: <20190429063834.45967-1-xiaolei.li@mediatek.com>
MTK NAND Controller has the ability to check whether read data are
mostly 0xff by comparing zero bit conut of read data with empty
threshold automatically.
But now we never set this threshold and always make it be default value
which is 10.
This patch fixes this problem by setting empty threshold as the product
of read sector count and ecc strength.
Fixes: 93db446a424c ("mtd: nand: move raw NAND related code to the raw/ subdir")
Signed-off-by: Xiaolei Li <xiaolei.li@mediatek.com>
---
drivers/mtd/nand/raw/mtk_nand.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/nand/raw/mtk_nand.c b/drivers/mtd/nand/raw/mtk_nand.c
index cf5e50e704ae..675d4faa3480 100644
--- a/drivers/mtd/nand/raw/mtk_nand.c
+++ b/drivers/mtd/nand/raw/mtk_nand.c
@@ -94,6 +94,7 @@
#define NFI_MASTER_STA (0x224)
#define MASTER_STA_MASK (0x0FFF)
#define NFI_EMPTY_THRESH (0x23C)
+#define EMPTY_THRESH_MASK GENMASK(7, 0)
#define MTK_NAME "mtk-nand"
#define KB(x) ((x) * 1024UL)
@@ -931,6 +932,10 @@ static int mtk_nfc_read_subpage(struct mtd_info *mtd, struct nand_chip *chip,
return -EINVAL;
}
+ /* Setup empty threshold */
+ reg = max(sectors * chip->ecc.strength, EMPTY_THRESH_MASK);
+ nfi_writel(nfc, reg, NFI_EMPTY_THRESH);
+
reg = nfi_readw(nfc, NFI_CNFG);
reg |= CNFG_READ_EN | CNFG_DMA_BURST_EN | CNFG_AHB;
if (!raw) {
--
2.18.0
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next prev parent reply other threads:[~2019-04-29 6:43 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-29 6:38 [PATCH 0/5] MTK NAND driver improvements and fixes Xiaolei Li
2019-04-29 6:38 ` [PATCH 1/5] mtd: rawnand: mtk: Correct low level time calculation of r/w cycle Xiaolei Li
2019-04-29 9:03 ` Miquel Raynal
2019-04-29 9:35 ` xiaolei li
2019-04-29 10:02 ` Miquel Raynal
2019-04-30 0:59 ` xiaolei li
2019-04-29 6:38 ` [PATCH 2/5] mtd: rawnand: mtk: Improve data sampling timing for read cycle Xiaolei Li
2019-04-29 9:10 ` Miquel Raynal
2019-04-29 9:49 ` xiaolei li
2019-04-29 6:38 ` [PATCH 3/5] mtd: rawnand: mtk: Add validity check for CE# pin setting Xiaolei Li
2019-04-29 9:11 ` Miquel Raynal
2019-04-29 6:38 ` [PATCH 4/5] mtd: rawnand: mtk: Fix wrongly assigned oob buffer pointer issue Xiaolei Li
2019-04-29 9:14 ` Miquel Raynal
2019-04-29 9:52 ` xiaolei li
2019-04-29 6:38 ` Xiaolei Li [this message]
2019-04-29 9:22 ` [PATCH 5/5] mtd: rawnand: mtk: Setup empty page threshold correctly Miquel Raynal
2019-04-29 9:57 ` xiaolei li
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