[coreboot-gerrit] Change in coreboot[master]: soc/intel/cmn/fast_spi: Add API to check if SPI Cycle In Progress

[Subrata Banik (Code Review)]

Subrata Banik has submitted this change. ( https://review.coreboot.org/c/coreboot/+/63624 )

Change subject: soc/intel/cmn/fast_spi: Add API to check if SPI Cycle In Progress
......................................................................

soc/intel/cmn/fast_spi: Add API to check if SPI Cycle In Progress

This patch creates a helper function to check if any SPI transaction
is pending.

As per Intel PCH BIOS spec section 3.6 Flash Security Recommendation,
it's important to ensure there is no pending SPI transaction before
setting SPI lock bits.

BUG=b:211954778
TEST=Able to build google/brya with this patch and no error msg seen
due to `SPI transaction is pending`.

Signed-off-by: Subrata Banik 
Change-Id: Ibd3f67ae60bfcb3610cd0950b057da97ff74b5b9
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63624
Tested-by: build bot (Jenkins) 
Reviewed-by: Werner Zeh 
---
M src/soc/intel/common/block/fast_spi/fast_spi_flash.c
M src/soc/intel/common/block/include/intelblocks/fast_spi.h
2 files changed, 14 insertions(+), 0 deletions(-)

Approvals:
  build bot (Jenkins): Verified
  Werner Zeh: Looks good to me, approved

diff --git a/src/soc/intel/common/block/fast_spi/fast_spi_flash.c b/src/soc/intel/common/block/fast_spi/fast_spi_flash.c
index 269db63..2bc7cf1 100644
--- a/src/soc/intel/common/block/fast_spi/fast_spi_flash.c
+++ b/src/soc/intel/common/block/fast_spi/fast_spi_flash.c
@@ -161,6 +161,18 @@
    return wait_for_hwseq_xfer(ctx, flash_addr);
 }

+int fast_spi_cycle_in_progress(void)
+{
+	BOILERPLATE_CREATE_CTX(ctx);
+
+	int ret = wait_for_hwseq_spi_cycle_complete(ctx);
+	if (ret != SUCCESS)
+		printk(BIOS_ERR, "SPI Transaction Timeout (Exceeded %d ms) due to prior"
+				" operation is pending\n", SPIBAR_HWSEQ_XFER_TIMEOUT_MS);
+
+	return ret;
+}
+
 /*
  * Ensure read/write xfer len is not greater than SPIBAR_FDATA_FIFO_SIZE and
  * that the operation does not cross page boundary.
diff --git a/src/soc/intel/common/block/include/intelblocks/fast_spi.h b/src/soc/intel/common/block/include/intelblocks/fast_spi.h
index a903ea83..eb3f2aa 100644
--- a/src/soc/intel/common/block/include/intelblocks/fast_spi.h
+++ b/src/soc/intel/common/block/include/intelblocks/fast_spi.h
@@ -5,6 +5,8 @@

#include <types.h>

+/* Check if SPI transaction is pending */
+int fast_spi_cycle_in_progress(void);
 /*
  * Disable the BIOS write protect and Enable Prefetching and Caching.
  */

3 is the latest approved patch-set.
No files were changed between the latest approved patch-set and the submitted one.