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mtd: rawnand: Ensure the nand chip supports cached reads

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Both the JEDEC and ONFI specification say that read cache sequential
support is an optional command. This means that we not only need to
check whether the individual controller supports the command, we also
need to check the parameter pages for both ONFI and JEDEC NAND flashes
before enabling sequential cache reads.

This fixes support for NAND flashes which don't support enabling cache
reads, i.e. Samsung K9F4G08U0F or Toshiba TC58NVG0S3HTA00.

Sequential cache reads are now only available for ONFI and JEDEC
devices, if individual vendors implement this, it needs to be enabled
per vendor.

Tested on i.MX6Q with a Samsung NAND flash chip that doesn't support
sequential reads.

Fixes: 003fe4b954 ("mtd: rawnand: Support for sequential cache reads")
Cc: stable@vger.kernel.org
Signed-off-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20230922141717.35977-1-r.czerwinski@pengutronix.de
This commit is contained in:
Rouven Czerwinski
2023-09-22 16:17:16 +02:00
committed by Miquel Raynal
parent 5279f4a9ee
commit f6ca3fb697
6 changed files with 15 additions and 0 deletions
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2
include/linux/mtd/rawnand.h
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@@ -225,6 +225,7 @@ struct gpio_desc;
* struct nand_parameters - NAND generic parameters from the parameter page
* @model: Model name
* @supports_set_get_features: The NAND chip supports setting/getting features
* @supports_read_cache: The NAND chip supports read cache operations
* @set_feature_list: Bitmap of features that can be set
* @get_feature_list: Bitmap of features that can be get
* @onfi: ONFI specific parameters
@@ -233,6 +234,7 @@ struct nand_parameters {
/* Generic parameters */
const char *model;
bool supports_set_get_features;
bool supports_read_cache;
DECLARE_BITMAP(set_feature_list, ONFI_FEATURE_NUMBER);
DECLARE_BITMAP(get_feature_list, ONFI_FEATURE_NUMBER);