[PATCH v4 14/17] mtd: rawnand: sunxi: avoid duplicate chip setup before page commands

[James Hilliard]

The page helpers invoke exec_op(), which selects the chip and programs
its timing and spare-area registers. Remove the identical setup directly
before those helpers in the read callbacks and PIO write callbacks.

Keep explicit selection in the DMA write callback: it accesses controller
registers and prepares DMA before issuing the program-begin operation.
Do not cache controller state or change selection after a controller reset.

Signed-off-by: James Hilliard <james.hilliard1@xxxxxxxxx>
---
 drivers/mtd/nand/raw/sunxi_nand.c | 12 ------------
 1 file changed, 12 deletions(-)

diff --git a/drivers/mtd/nand/raw/sunxi_nand.c b/drivers/mtd/nand/raw/sunxi_nand.c
index 5fba3c111a4b..84e1e04d0743 100644
--- a/drivers/mtd/nand/raw/sunxi_nand.c
+++ b/drivers/mtd/nand/raw/sunxi_nand.c
@@ -1755,8 +1755,6 @@ static int sunxi_nfc_hw_ecc_read_page(struct nand_chip *nand, uint8_t *buf,
 	int ret, i, cur_off = 0;
 	bool erased_chunk_found = false;
 
-	sunxi_nfc_select_chip(nand, nand->cur_cs);
-
 	ret = nand_read_page_op(nand, page, 0, NULL, 0);
 	if (ret)
 		return ret;
@@ -1805,8 +1803,6 @@ static int sunxi_nfc_hw_ecc_read_page_dma(struct nand_chip *nand, u8 *buf,
 {
 	int ret;
 
-	sunxi_nfc_select_chip(nand, nand->cur_cs);
-
 	ret = nand_read_page_op(nand, page, 0, NULL, 0);
 	if (ret)
 		return ret;
@@ -1835,8 +1831,6 @@ static int sunxi_nfc_hw_ecc_read_subpage(struct nand_chip *nand,
 	if (sunxi_nand->randomized_oob)
 		return sunxi_nfc_hw_ecc_read_page(nand, bufpoi, false, page);
 
-	sunxi_nfc_select_chip(nand, nand->cur_cs);
-
 	ret = nand_read_page_op(nand, page, 0, NULL, 0);
 	if (ret)
 		return ret;
@@ -1877,8 +1871,6 @@ static int sunxi_nfc_hw_ecc_read_subpage_dma(struct nand_chip *nand,
 	if (to_sunxi_nand(nand)->randomized_oob)
 		return sunxi_nfc_hw_ecc_read_page_dma(nand, buf, false, page);
 
-	sunxi_nfc_select_chip(nand, nand->cur_cs);
-
 	ret = nand_read_page_op(nand, page, 0, NULL, 0);
 	if (ret)
 		return ret;
@@ -1902,8 +1894,6 @@ static int sunxi_nfc_hw_ecc_write_page(struct nand_chip *nand,
 	struct nand_ecc_ctrl *ecc = &nand->ecc;
 	int ret = 0, i, cur_off = 0;
 
-	sunxi_nfc_select_chip(nand, nand->cur_cs);
-
 	ret = nand_prog_page_begin_op(nand, page, 0, NULL, 0);
 	if (ret)
 		return ret;
@@ -1947,8 +1937,6 @@ static int sunxi_nfc_hw_ecc_write_subpage(struct nand_chip *nand,
 	struct nand_ecc_ctrl *ecc = &nand->ecc;
 	int ret = 0, i, cur_off = 0;
 
-	sunxi_nfc_select_chip(nand, nand->cur_cs);
-
 	ret = nand_prog_page_begin_op(nand, page, 0, NULL, 0);
 	if (ret)
 		return ret;

-- 
2.53.0