diff mbox series

[v1,2/5] mtd: rawnand: meson: replace GENMASK() macro with define

Message ID 20230412061700.1492474-3-AVKrasnov@sberdevices.ru (mailing list archive)
State Superseded
Headers show
Series refactoring and fix for Meson NAND | expand

Commit Message

Arseniy Krasnov April 12, 2023, 6:16 a.m. UTC 
Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
---
 drivers/mtd/nand/raw/meson_nand.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

Comments

Neil Armstrong April 12, 2023, 7:37 a.m. UTC | #1 
Hi,

On 12/04/2023 08:16, Arseniy Krasnov wrote:

Please add a commit message

> Signed-off-by: Arseniy Krasnov <AVKrasnov@sberdevices.ru>
> ---
>   drivers/mtd/nand/raw/meson_nand.c | 8 +++++---
>   1 file changed, 5 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
> index 256c37c76526..45b53d420aed 100644
> --- a/drivers/mtd/nand/raw/meson_nand.c
> +++ b/drivers/mtd/nand/raw/meson_nand.c
> @@ -110,6 +110,8 @@
>   
>   #define PER_INFO_BYTE		8
>   
> +#define NFC_CMD_RAW_LEN		(GENMASK(13, 0))

Drop the () around GENMASK(13, 0)

> +
>   struct meson_nfc_nand_chip {
>   	struct list_head node;
>   	struct nand_chip nand;
> @@ -300,7 +302,7 @@ static void meson_nfc_cmd_access(struct nand_chip *nand, int raw, bool dir,
>   
>   	if (raw) {
>   		len = mtd->writesize + mtd->oobsize;
> -		cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir);
> +		cmd = (len & NFC_CMD_RAW_LEN) | scrambler | DMA_DIR(dir);
>   		writel(cmd, nfc->reg_base + NFC_REG_CMD);
>   		return;
>   	}
> @@ -550,7 +552,7 @@ static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len)
>   	if (ret)
>   		goto out;
>   
> -	cmd = NFC_CMD_N2M | (len & GENMASK(13, 0));
> +	cmd = NFC_CMD_N2M | (len & NFC_CMD_RAW_LEN);
>   	writel(cmd, nfc->reg_base + NFC_REG_CMD);
>   
>   	meson_nfc_drain_cmd(nfc);
> @@ -574,7 +576,7 @@ static int meson_nfc_write_buf(struct nand_chip *nand, u8 *buf, int len)
>   	if (ret)
>   		return ret;
>   
> -	cmd = NFC_CMD_M2N | (len & GENMASK(13, 0));
> +	cmd = NFC_CMD_M2N | (len & NFC_CMD_RAW_LEN);
>   	writel(cmd, nfc->reg_base + NFC_REG_CMD);
>   
>   	meson_nfc_drain_cmd(nfc);

Thanks,
Neil
David Laight April 12, 2023, 10:06 a.m. UTC | #2 
From: Arseniy Krasnov
> Sent: 12 April 2023 07:17
> Subject: [PATCH v1 2/5] mtd: rawnand: meson: replace GENMASK() macro with define
> 
...
>  		len = mtd->writesize + mtd->oobsize;
> -		cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir);
> +		cmd = (len & NFC_CMD_RAW_LEN) | scrambler | DMA_DIR(dir);
>  		writel(cmd, nfc->reg_base + NFC_REG_CMD);

What is the point of the mask?
If the length is too big it just generates a different
'hard to debug' error.
If the length can't be too bit there is no point masking it.

	David

-
Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
Registration No: 1397386 (Wales)
Arseniy Krasnov April 12, 2023, 10:11 a.m. UTC | #3 
On 12.04.2023 13:06, David Laight wrote:
> From: Arseniy Krasnov
>> Sent: 12 April 2023 07:17
>> Subject: [PATCH v1 2/5] mtd: rawnand: meson: replace GENMASK() macro with define
>>
> ...
>>  		len = mtd->writesize + mtd->oobsize;
>> -		cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir);
>> +		cmd = (len & NFC_CMD_RAW_LEN) | scrambler | DMA_DIR(dir);
>>  		writel(cmd, nfc->reg_base + NFC_REG_CMD);
> 
> What is the point of the mask?
> If the length is too big it just generates a different
> 'hard to debug' error.
> If the length can't be too bit there is no point masking it.

Exactly, thanks for pointing!

Thanks, Arseniy

> 
> 	David
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK
> Registration No: 1397386 (Wales)
>
diff mbox series

Patch

diff --git a/drivers/mtd/nand/raw/meson_nand.c b/drivers/mtd/nand/raw/meson_nand.c
index 256c37c76526..45b53d420aed 100644
--- a/drivers/mtd/nand/raw/meson_nand.c
+++ b/drivers/mtd/nand/raw/meson_nand.c
@@ -110,6 +110,8 @@ 
 
 #define PER_INFO_BYTE		8
 
+#define NFC_CMD_RAW_LEN		(GENMASK(13, 0))
+
 struct meson_nfc_nand_chip {
 	struct list_head node;
 	struct nand_chip nand;
@@ -300,7 +302,7 @@  static void meson_nfc_cmd_access(struct nand_chip *nand, int raw, bool dir,
 
 	if (raw) {
 		len = mtd->writesize + mtd->oobsize;
-		cmd = (len & GENMASK(13, 0)) | scrambler | DMA_DIR(dir);
+		cmd = (len & NFC_CMD_RAW_LEN) | scrambler | DMA_DIR(dir);
 		writel(cmd, nfc->reg_base + NFC_REG_CMD);
 		return;
 	}
@@ -550,7 +552,7 @@  static int meson_nfc_read_buf(struct nand_chip *nand, u8 *buf, int len)
 	if (ret)
 		goto out;
 
-	cmd = NFC_CMD_N2M | (len & GENMASK(13, 0));
+	cmd = NFC_CMD_N2M | (len & NFC_CMD_RAW_LEN);
 	writel(cmd, nfc->reg_base + NFC_REG_CMD);
 
 	meson_nfc_drain_cmd(nfc);
@@ -574,7 +576,7 @@  static int meson_nfc_write_buf(struct nand_chip *nand, u8 *buf, int len)
 	if (ret)
 		return ret;
 
-	cmd = NFC_CMD_M2N | (len & GENMASK(13, 0));
+	cmd = NFC_CMD_M2N | (len & NFC_CMD_RAW_LEN);
 	writel(cmd, nfc->reg_base + NFC_REG_CMD);
 
 	meson_nfc_drain_cmd(nfc);