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programmer.h: Guard against sending spi commands on non-spi mst

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Validate (flash->chip->bustype == BUS_SPI) as ich copies the
chip flags in the opaque master and tries incorrectly
to issue 4BA commands which results in failure.

The issue was detected only in the case of chips >16MB, in
this case 'W25Q256FV' that has the feature bits:
```
 .feature_bits   = FEATURE_WRSR_WREN | FEATURE_OTP | FEATURE_4BA_ENTER_WREN |
                   FEATURE_4BA_EAR_C5C8 | FEATURE_4BA_READ | FEATURE_4BA_FAST_READ |
                   FEATURE_WRSR2,
```
The regression was noticed from,
commit 0741727925b841c2479b993204ce58c5eb75185a ichspi.c: Read chip ID and use it to populate `flash->chip`

TEST=In the case of 'W25Q256FV' on TigerLake.

Change-Id: I7cce4f9c032d33c01bf616e27a50b9727a40fe1b
Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Reviewed-on: https://review.coreboot.org/c/flashrom/+/71269
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jonathon Hall <jonathon.hall@puri.sm>
Reviewed-by: Sam McNally <sammc@google.com>
This commit is contained in:
Edward O'Callaghan 2022-12-25 11:06:10 +11:00 committed by Edward O'Callaghan
parent e4c51439ac
commit c1fb4bd9fd
2 changed files with 7 additions and 1 deletions
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2
flashrom.c
View File

@ -1944,7 +1944,7 @@ int prepare_flash_access(struct flashctx *const flash,
}
/* Enable/disable 4-byte addressing mode if flash chip supports it */
if (flash->chip->feature_bits & (FEATURE_4BA_ENTER | FEATURE_4BA_ENTER_WREN | FEATURE_4BA_ENTER_EAR7)) {
if (spi_chip_4ba(flash)) {
int ret;
if (spi_master_4ba(flash))
ret = spi_enter_4ba(flash);

6
include/programmer.h
View File

@ -513,6 +513,12 @@ static inline bool spi_master_no_4ba_modes(const struct flashctx *const flash)
return flash->mst->buses_supported & BUS_SPI &&
flash->mst->spi.features & SPI_MASTER_NO_4BA_MODES;
}
/* spi_chip feature checks */
static inline bool spi_chip_4ba(const struct flashctx *const flash)
{
return flash->chip->bustype == BUS_SPI &&
(flash->chip->feature_bits & (FEATURE_4BA_ENTER | FEATURE_4BA_ENTER_WREN | FEATURE_4BA_ENTER_EAR7));
}
/* usbdev.c */
struct libusb_device_handle;