[PATCH] spi: spi-qpic-snand: avoid writing QPIC_EBI2_ECC_BUF_CFG register

[Gabor Juhos]

The description of commit bfb34eced559 ("mtd: rawnand: qcom: avoid writing
to obsolete register") says this:

  "QPIC_EBI2_ECC_BUF_CFG register got obsolete from QPIC V2.0 onwards.
  Avoid writing this register if QPIC version is V2.0 or newer."

Although the referenced commit is related to the 'qcom-nandc' driver,
however the hardware supported by the current driver is also based on
QPIC v2.0 so we should avoid writing that register here as well.

Remove the register writing code to avoid undefined behaviour.

Fixes: 7304d1909080 ("spi: spi-qpic: add driver for QCOM SPI NAND flash Interface")
Signed-off-by: Gabor Juhos <j4g8y7@xxxxxxxxx>
---
 drivers/spi/spi-qpic-snand.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/spi/spi-qpic-snand.c b/drivers/spi/spi-qpic-snand.c
index 61b1f2eb19ce..05efe6313b7f 100644
--- a/drivers/spi/spi-qpic-snand.c
+++ b/drivers/spi/spi-qpic-snand.c
@@ -765,8 +765,6 @@ static int qcom_spi_read_cw_raw(struct qcom_nand_controller *snandc, u8 *data_bu
 
 	qcom_write_reg_dma(snandc, &snandc->regs->addr0, NAND_ADDR0, 2, 0);
 	qcom_write_reg_dma(snandc, &snandc->regs->cfg0, NAND_DEV0_CFG0, 3, 0);
-	qcom_write_reg_dma(snandc, &snandc->regs->ecc_buf_cfg, NAND_EBI2_ECC_BUF_CFG, 1, 0);
-
 	qcom_write_reg_dma(snandc, &snandc->regs->erased_cw_detect_cfg_clr,
 			   NAND_ERASED_CW_DETECT_CFG, 1, 0);
 	qcom_write_reg_dma(snandc, &snandc->regs->erased_cw_detect_cfg_set,
@@ -1104,8 +1102,6 @@ static void qcom_spi_config_page_write(struct qcom_nand_controller *snandc)
 {
 	qcom_write_reg_dma(snandc, &snandc->regs->addr0, NAND_ADDR0, 2, 0);
 	qcom_write_reg_dma(snandc, &snandc->regs->cfg0, NAND_DEV0_CFG0, 3, 0);
-	qcom_write_reg_dma(snandc, &snandc->regs->ecc_buf_cfg, NAND_EBI2_ECC_BUF_CFG,
-			   1, NAND_BAM_NEXT_SGL);
 }
 
 static void qcom_spi_config_cw_write(struct qcom_nand_controller *snandc)

---
base-commit: cb2ad3c020579bf51fb0d702db9cf64af9698377
change-id: 20260909-qpic-snand-avoid-ebi2-reg-write-0920452b4b3b

Best regards,
-- 
Gabor Juhos <j4g8y7@xxxxxxxxx>