diff options
Diffstat (limited to 'src/drivers/spi')
| -rw-r--r-- | src/drivers/spi/cbfs_spi.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/src/drivers/spi/cbfs_spi.c b/src/drivers/spi/cbfs_spi.c index 1895b9df1e..46e7346379 100644 --- a/src/drivers/spi/cbfs_spi.c +++ b/src/drivers/spi/cbfs_spi.c @@ -23,14 +23,44 @@ #include <spi_flash.h> #include <symbols.h> #include <cbmem.h> +#include <timer.h> static struct spi_flash *spi_flash_info; +/* + * Set this to 1 to debug SPI speed, 0 to disable it + * The format is: + * + * read SPI 62854 7db7: 10416 us, 3089 KB/s, 24.712 Mbps + * + * The important number is the last one. It should roughly match your SPI + * clock. If it doesn't, your driver might need a little tuning. + */ +#define SPI_SPEED_DEBUG 0 + static ssize_t spi_readat(const struct region_device *rd, void *b, size_t offset, size_t size) { + struct stopwatch sw; + bool show = SPI_SPEED_DEBUG && size >= 4 * KiB; + + if (show) + stopwatch_init(&sw); if (spi_flash_info->read(spi_flash_info, offset, size, b)) return -1; + if (show) { + long usecs; + + usecs = stopwatch_duration_usecs(&sw); + u64 speed; /* KiB/s */ + int bps; /* Bits per second */ + + speed = (u64)size * 1000 / usecs; + bps = speed * 8; + + printk(BIOS_DEBUG, "read SPI %#zx %#zx: %ld us, %lld KB/s, %d.%03d Mbps\n", + offset, size, usecs, speed, bps / 1000, bps % 1000); + } return size; } |