RE: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI NOR flash memories

Yogesh Narayan Gaur
2018-10-22T11:46:55Z

Hi,

> -----Original Message-----
> From: Boris Brezillon [mailto:boris.brezillon@bootlin.com]
> Sent: Monday, October 22, 2018 5:13 PM
> To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>
> Cc: Cristian.Birsan@microchip.com; Tudor Ambarus
> <tudor.ambarus@microchip.com>; richard@nod.at; Mark Brown
> <broonie@kernel.org>; linux-kernel@vger.kernel.org;
> nicolas.ferre@microchip.com; marek.vasut@gmail.com;
> cyrille.pitchen@microchip.com; linux-mtd@lists.infradead.org; Cyrille Pitchen
> <cyrille.pitchen@wedev4u.fr>; computersforpeace@gmail.com;
> dwmw2@infradead.org; linux-arm-kernel@lists.infradead.org
> Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform SFDP SPI
> NOR flash memories
>
> On Mon, 22 Oct 2018 11:03:09 +0000
> Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com> wrote:
>
> > Hi,
> >
> > > -----Original Message-----
> > > From: Boris Brezillon [mailto:boris.brezillon@bootlin.com]
> > > Sent: Monday, October 22, 2018 4:23 PM
> > > To: Yogesh Narayan Gaur <yogeshnarayan.gaur@nxp.com>;
> > > Cristian.Birsan@microchip.com
> > > Cc: Tudor Ambarus <tudor.ambarus@microchip.com>; richard@nod.at;
> > > Mark Brown <broonie@kernel.org>; linux-kernel@vger.kernel.org;
> > > nicolas.ferre@microchip.com; marek.vasut@gmail.com;
> > > cyrille.pitchen@microchip.com; linux-mtd@lists.infradead.org;
> > > Cyrille Pitchen <cyrille.pitchen@wedev4u.fr>;
> > > computersforpeace@gmail.com; dwmw2@infradead.org;
> > > linux-arm-kernel@lists.infradead.org
> > > Subject: Re: [PATCH v3 1/2] mtd: spi-nor: add support to non-uniform
> > > SFDP SPI NOR flash memories
> > >
> > > On Mon, 22 Oct 2018 12:46:27 +0200
> > > Boris Brezillon <boris.brezillon@bootlin.com> wrote:
> > >
> > > > On Mon, 22 Oct 2018 10:39:48 +0000 Yogesh Narayan Gaur
> > > > <yogeshnarayan.gaur@nxp.com> wrote:
> > > >
Patch used

--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -2863,26 +2863,39 @@ static u8 spi_nor_smpt_read_dummy(const struct spi_nor *nor, const u32 settings)
* @nor: pointer to a 'struct spi_nor'
* @smpt: pointer to the sector map parameter table
*/
-static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
+static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt, u32 smpt_len)
{
const u32 *ret = NULL;
- u32 i, addr;
+ u32 i, addr, nmaps;
int err;
u8 addr_width, read_opcode, read_dummy;
u8 read_data_mask, data_byte, map_id;
+ bool map_id_is_valid = false;

addr_width = nor->addr_width;
read_dummy = nor->read_dummy;
read_opcode = nor->read_opcode;

+ pr_info("Start [addr_width:%08x, read_dumy:%08x, read_opcode:%08x]\n", nor->addr_width, nor->read_dummy, nor->read_opcode);
+
+ for (i = 0; i<smpt_len; i++)
+ pr_info("%s:%i smpt[%d]=%08x\n", __func__, __LINE__, i, smpt[i]);
+
map_id = 0;
- i = 0;
/* Determine if there are any optional Detection Command Descriptors */
- while (!(smpt[i] & SMPT_DESC_TYPE_MAP)) {
+ for (i = 0; i< smpt_len; i++) {
+ if ((smpt[i] & SMPT_DESC_TYPE_MAP))
+ break;
+
read_data_mask = SMPT_CMD_READ_DATA(smpt[i]);
nor->addr_width = spi_nor_smpt_addr_width(nor, smpt[i]);
- nor->read_dummy = spi_nor_smpt_read_dummy(nor, smpt[i]);
+ if (!nor->addr_width)
+ nor->addr_width = 3;
+
+ nor->read_dummy = 8; //spi_nor_smpt_read_dummy(nor, smpt[i]);
nor->read_opcode = SMPT_CMD_OPCODE(smpt[i]);
+ pr_info("smpt[%d]=[addr_width:%08x, read_dumy:%08x, read_opcode:%08x]\n", i, nor->addr_width, nor->read_dummy, nor->read_opcode);
+
addr = smpt[i + 1];

err = spi_nor_read_raw(nor, addr, 1, &data_byte);
@@ -2894,18 +2907,37 @@ static const u32 *spi_nor_get_map_in_use(struct spi_nor *nor, const u32 *smpt)
* Configuration that is currently in use.
*/
map_id = map_id << 1 | !!(data_byte & read_data_mask);
- i = i + 2;
+ map_id_is_valid = true;
}

- /* Find the matching configuration map */
- while (SMPT_MAP_ID(smpt[i]) != map_id) {
- if (smpt[i] & SMPT_DESC_END)
- goto out;
+ if (map_id_is_valid)
+ pr_info("%s:%i map_id=%d smpt_len:%d i=:%d\n", __func__, __LINE__, map_id, smpt_len, i);
+ else
+ pr_info("%s:%i NO map_id\n", __func__, __LINE__);
+
+ for (nmaps = 0; i< smpt_len; nmaps++) {
+ if(!(smpt[i] & SMPT_DESC_TYPE_MAP)) {
+ i += 2;
+ continue;
+ }
+
+ if(!map_id_is_valid) {
+ if (nmaps) {
+ ret = NULL;
+ break;
+ }
+
+ ret = smpt+i;
+ } else if (map_id == SMPT_MAP_ID(smpt[i])) {
+ ret = smpt+i;
+ break;
+ }
+
/* increment the table index to the next map */
i += SMPT_MAP_REGION_COUNT(smpt[i]) + 1;
}

- ret = smpt + i;
+ pr_info("End [addr_width:%08x, read_dumy:%08x, read_opcode:%08x]\n", nor->addr_width, nor->read_dummy, nor->read_opcode);
/* fall through */
out:
nor->addr_width = addr_width;
@@ -3027,8 +3059,9 @@ static int spi_nor_parse_smpt(struct spi_nor *nor,
for (i = 0; i < smpt_header->length; i++)
smpt[i] = le32_to_cpu(smpt[i]);

- sector_map = spi_nor_get_map_in_use(nor, smpt);
+ sector_map = spi_nor_get_map_in_use(nor, smpt, smpt_header->length);
if (!sector_map) {
+ pr_info("%s:%i\n", __func__, __LINE__);
ret = -EINVAL;
goto out;
}