mtd: rawnand: qcom: Fix read len for onfi param page

BugLink: https://bugs.launchpad.net/bugs/2120812

commit e6031b11544b44966ba020c867fe438bccd3bdfa upstream.

The minimum size to fetch the data from device to QPIC buffer
is 512-bytes. If size is less than 512-bytes the data will not be
protected by ECC as per QPIC standard. So while reading onfi parameter
page from NAND device set nandc->buf_count = 512.

Cc: [email protected]
Fixes: 89550be ("mtd: rawnand: qcom: Implement exec_op()")
Reviewed-by: Manivannan Sadhasivam <[email protected]>
Tested-by: Lakshmi Sowjanya D <[email protected]>
Signed-off-by: Md Sadre Alam <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Noah Wager <[email protected]>
Signed-off-by: Stefan Bader <[email protected]>

Author: Md Sadre Alam

drivers/mtd/nand/raw/qcom_nandc.c

@@ -1922,7 +1922,7 @@ static int qcom_param_page_type_exec(struct nand_chip *chip,  const struct nand_
 		qcom_write_reg_dma(nandc, &nandc->regs->cmd1, NAND_DEV_CMD1, 1, NAND_BAM_NEXT_SGL);
 	}
 
-	nandc->buf_count = len;
+	nandc->buf_count = 512;
 	memset(nandc->data_buffer, 0xff, nandc->buf_count);
 
 	config_nand_single_cw_page_read(chip, false, 0);