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Date: Mon, 3 Jun 2019 10:11:20 -0400
From: Kamal Dasu <kdasu.kdev@...il.com>
To: Boris Brezillon <boris.brezillon@...labora.com>
Cc: MTD Maling List <linux-mtd@...ts.infradead.org>,
Vignesh Raghavendra <vigneshr@...com>,
Richard Weinberger <richard@....at>,
Linux Kernel Mailing List <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
Boris,
On Sat, Jun 1, 2019 at 3:57 AM Boris Brezillon
<boris.brezillon@...labora.com> wrote:
>
> 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?
This was done to make the code more readable. It does not make any
difference to performance.
>
> >
> > 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);
>
Thanks
Kamal
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