From: Tejas Bhumkar Date: Sun, 28 Jan 2024 06:37:46 +0000 (+0530) Subject: spi: cadence_qspi: Address the comparison failure for 0-8 bytes of data X-Git-Url: http://git.dujemihanovic.xyz/html/%7B%7B%20.Permalink%20%7D%7D?a=commitdiff_plain;h=b4b0228db8408af56472ceeae279693073ed2204;p=u-boot.git spi: cadence_qspi: Address the comparison failure for 0-8 bytes of data The current implementation encounters issues when testing data ranging from 0 to 8 bytes. This was confirmed through testing with both ISSI (IS25WX256) and Micron (MT35XU02G) Flash exclusively in SDR mode. Upon investigation, it was observed that utilizing the "SPI_NOR_OCTAL_READ" flag and attempting to read less than 8 bytes in STIG mode results in a read failure, leading to a compare test failure. To resolve this issue, the CMD_4BYTE_FAST_READ opcode is now utilized instead of CMD_4BYTE_OCTAL_READ, specifically in SDR mode. This is based on patch series: https://lore.kernel.org/all/cover.1701853668.git.tejas.arvind.bhumkar@amd.com/ Signed-off-by: Tejas Bhumkar Reviewed-by: Jagan Teki --- diff --git a/drivers/spi/cadence_ospi_versal.c b/drivers/spi/cadence_ospi_versal.c index e02a3b3de3..c2be307f1d 100644 --- a/drivers/spi/cadence_ospi_versal.c +++ b/drivers/spi/cadence_ospi_versal.c @@ -18,9 +18,6 @@ #include "cadence_qspi.h" #include -#define CMD_4BYTE_READ 0x13 -#define CMD_4BYTE_FAST_READ 0x0C - int cadence_qspi_apb_dma_read(struct cadence_spi_priv *priv, const struct spi_mem_op *op) { diff --git a/drivers/spi/cadence_qspi.h b/drivers/spi/cadence_qspi.h index 12825f8911..693474a287 100644 --- a/drivers/spi/cadence_qspi.h +++ b/drivers/spi/cadence_qspi.h @@ -33,6 +33,10 @@ #define CQSPI_DUMMY_BYTES_MAX 4 #define CQSPI_DUMMY_CLKS_MAX 31 +#define CMD_4BYTE_FAST_READ 0x0C +#define CMD_4BYTE_OCTAL_READ 0x7c +#define CMD_4BYTE_READ 0x13 + /**************************************************************************** * Controller's configuration and status register (offset from QSPI_BASE) ****************************************************************************/ diff --git a/drivers/spi/cadence_qspi_apb.c b/drivers/spi/cadence_qspi_apb.c index d033184aa4..fb90532217 100644 --- a/drivers/spi/cadence_qspi_apb.c +++ b/drivers/spi/cadence_qspi_apb.c @@ -469,6 +469,9 @@ int cadence_qspi_apb_command_read(struct cadence_spi_priv *priv, else opcode = op->cmd.opcode; + if (opcode == CMD_4BYTE_OCTAL_READ && !priv->dtr) + opcode = CMD_4BYTE_FAST_READ; + reg = opcode << CQSPI_REG_CMDCTRL_OPCODE_LSB; /* Set up dummy cycles. */