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Date: Sat, 1 Jun 2019 09:57:48 +0200
From: Boris Brezillon <boris.brezillon@...labora.com>
To: Kamal Dasu <kdasu.kdev@...il.com>
Cc: linux-mtd@...ts.infradead.org,
Vignesh Raghavendra <vigneshr@...com>,
Richard Weinberger <richard@....at>,
linux-kernel@...r.kernel.org, Marek Vasut <marek.vasut@...il.com>,
bcm-kernel-feedback-list@...adcom.com,
Miquel Raynal <miquel.raynal@...tlin.com>,
Brian Norris <computersforpeace@...il.com>,
David Woodhouse <dwmw2@...radead.org>
Subject: Re: [PATCH 1/3] mtd: nand: raw: brcmnand: Refactored code and
introduced inline functions
On Thu, 30 May 2019 17:20:35 -0400
Kamal Dasu <kdasu.kdev@...il.com> wrote:
> Refactored NAND ECC and CMD address configuration code to use inline
> functions.
I'd expect the compiler to be smart enough to decide when inlining is
appropriate. Did you check that adding the inline specifier actually
makes a difference?
>
> Signed-off-by: Kamal Dasu <kdasu.kdev@...il.com>
> ---
> drivers/mtd/nand/raw/brcmnand/brcmnand.c | 100 +++++++++++++++++++------------
> 1 file changed, 62 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/mtd/nand/raw/brcmnand/brcmnand.c b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> index ce0b8ff..77b7850 100644
> --- a/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> +++ b/drivers/mtd/nand/raw/brcmnand/brcmnand.c
> @@ -588,6 +588,54 @@ static inline void brcmnand_write_fc(struct brcmnand_controller *ctrl,
> __raw_writel(val, ctrl->nand_fc + word * 4);
> }
>
> +static inline void brcmnand_clear_ecc_addr(struct brcmnand_controller *ctrl)
> +{
> +
> + /* Clear error addresses */
> + brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
> + brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
> + brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_EXT_ADDR, 0);
> + brcmnand_write_reg(ctrl, BRCMNAND_CORR_EXT_ADDR, 0);
> +}
> +
> +static inline u64 brcmnand_get_uncorrecc_addr(struct brcmnand_controller *ctrl)
> +{
> + u64 err_addr;
> +
> + err_addr = brcmnand_read_reg(ctrl, BRCMNAND_UNCORR_ADDR);
> + err_addr |= ((u64)(brcmnand_read_reg(ctrl,
> + BRCMNAND_UNCORR_EXT_ADDR)
> + & 0xffff) << 32);
> +
> + return err_addr;
> +}
> +
> +static inline u64 brcmnand_get_correcc_addr(struct brcmnand_controller *ctrl)
> +{
> + u64 err_addr;
> +
> + err_addr = brcmnand_read_reg(ctrl, BRCMNAND_CORR_ADDR);
> + err_addr |= ((u64)(brcmnand_read_reg(ctrl,
> + BRCMNAND_CORR_EXT_ADDR)
> + & 0xffff) << 32);
> +
> + return err_addr;
> +}
> +
> +static inline void brcmnand_set_cmd_addr(struct mtd_info *mtd, u64 addr)
> +{
> + struct nand_chip *chip = mtd_to_nand(mtd);
> + struct brcmnand_host *host = nand_get_controller_data(chip);
> + struct brcmnand_controller *ctrl = host->ctrl;
> +
> + brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> + (host->cs << 16) | ((addr >> 32) & 0xffff));
> + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> + brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
> + lower_32_bits(addr));
> + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> +}
> +
> static inline u16 brcmnand_cs_offset(struct brcmnand_controller *ctrl, int cs,
> enum brcmnand_cs_reg reg)
> {
> @@ -1213,9 +1261,12 @@ static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd)
> {
> struct brcmnand_controller *ctrl = host->ctrl;
> int ret;
> + u64 cmd_addr;
> +
> + cmd_addr = brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> +
> + dev_dbg(ctrl->dev, "send native cmd %d addr 0x%llx\n", cmd, cmd_addr);
>
> - dev_dbg(ctrl->dev, "send native cmd %d addr_lo 0x%x\n", cmd,
> - brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS));
> BUG_ON(ctrl->cmd_pending != 0);
> ctrl->cmd_pending = cmd;
>
> @@ -1374,12 +1425,7 @@ static void brcmnand_cmdfunc(struct nand_chip *chip, unsigned command,
> if (!native_cmd)
> return;
>
> - brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> - (host->cs << 16) | ((addr >> 32) & 0xffff));
> - (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> - brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, lower_32_bits(addr));
> - (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> -
> + brcmnand_set_cmd_addr(mtd, addr);
> brcmnand_send_cmd(host, native_cmd);
> brcmnand_waitfunc(chip);
>
> @@ -1597,20 +1643,10 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
> struct brcmnand_controller *ctrl = host->ctrl;
> int i, j, ret = 0;
>
> - /* Clear error addresses */
> - brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0);
> - brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0);
> - brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_EXT_ADDR, 0);
> - brcmnand_write_reg(ctrl, BRCMNAND_CORR_EXT_ADDR, 0);
> -
> - brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> - (host->cs << 16) | ((addr >> 32) & 0xffff));
> - (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> + brcmnand_clear_ecc_addr(ctrl);
>
> for (i = 0; i < trans; i++, addr += FC_BYTES) {
> - brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
> - lower_32_bits(addr));
> - (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> + brcmnand_set_cmd_addr(mtd, addr);
> /* SPARE_AREA_READ does not use ECC, so just use PAGE_READ */
> brcmnand_send_cmd(host, CMD_PAGE_READ);
> brcmnand_waitfunc(chip);
> @@ -1630,21 +1666,15 @@ static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip,
> host->hwcfg.sector_size_1k);
>
> if (!ret) {
> - *err_addr = brcmnand_read_reg(ctrl,
> - BRCMNAND_UNCORR_ADDR) |
> - ((u64)(brcmnand_read_reg(ctrl,
> - BRCMNAND_UNCORR_EXT_ADDR)
> - & 0xffff) << 32);
> + *err_addr = brcmnand_get_uncorrecc_addr(ctrl);
> +
> if (*err_addr)
> ret = -EBADMSG;
> }
>
> if (!ret) {
> - *err_addr = brcmnand_read_reg(ctrl,
> - BRCMNAND_CORR_ADDR) |
> - ((u64)(brcmnand_read_reg(ctrl,
> - BRCMNAND_CORR_EXT_ADDR)
> - & 0xffff) << 32);
> + *err_addr = brcmnand_get_correcc_addr(ctrl);
> +
> if (*err_addr)
> ret = -EUCLEAN;
> }
> @@ -1711,7 +1741,7 @@ static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip,
> dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf);
>
> try_dmaread:
> - brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_COUNT, 0);
> + brcmnand_clear_ecc_addr(ctrl);
>
> if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) {
> err = brcmnand_dma_trans(host, addr, buf, trans * FC_BYTES,
> @@ -1858,15 +1888,9 @@ static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip,
> goto out;
> }
>
> - brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS,
> - (host->cs << 16) | ((addr >> 32) & 0xffff));
> - (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS);
> -
> for (i = 0; i < trans; i++, addr += FC_BYTES) {
> /* full address MUST be set before populating FC */
> - brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS,
> - lower_32_bits(addr));
> - (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS);
> + brcmnand_set_cmd_addr(mtd, addr);
>
> if (buf) {
> brcmnand_soc_data_bus_prepare(ctrl->soc, false);
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