From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-wm0-f49.google.com ([74.125.82.49]:37067 "EHLO mail-wm0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752878AbdHGL0B (ORCPT ); Mon, 7 Aug 2017 07:26:01 -0400 Received: by mail-wm0-f49.google.com with SMTP id t201so4623366wmt.0 for ; Mon, 07 Aug 2017 04:26:01 -0700 (PDT) From: Arend van Spriel Subject: Re: [PATCH 07/34] brcmfmac: Remove brcmf_sdiod_request_data() To: Ian Molton , linux-wireless@vger.kernel.org References: <20170726202557.15632-1-ian@mnementh.co.uk> <20170726202557.15632-8-ian@mnementh.co.uk> Cc: franky.lin@broadcom.com, hante.meuleman@broadcom.com Message-ID: <59884E46.5090000@broadcom.com> (sfid-20170807_132604_751108_0786C151) Date: Mon, 7 Aug 2017 13:25:58 +0200 MIME-Version: 1.0 In-Reply-To: <20170726202557.15632-8-ian@mnementh.co.uk> Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-wireless-owner@vger.kernel.org List-ID: On 26-07-17 22:25, Ian Molton wrote: > This function is obfuscating how IO works on this chip. Remove it > and push its logic into brcmf_sdiod_reg_{read,write}(). > > Handling of -ENOMEDIUM is altered, but as that's pretty much broken anyway > we can ignore that. Please explain why you think it is broken. Reviewed-by: Arend van Spriel > Signed-off-by: Ian Molton more comments below. > # Conflicts: > # drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c > --- > .../wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c | 239 ++++++++------------- > .../wireless/broadcom/brcm80211/brcmfmac/sdio.h | 2 +- > 2 files changed, 87 insertions(+), 154 deletions(-) > > diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c > index d217b1281e0d..f703d7be6a85 100644 > --- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c > +++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c [...] > static int brcmf_sdiod_reg_write(struct brcmf_sdio_dev *sdiodev, u32 addr, > u8 regsz, void *data) > { > - u8 func; > - s32 retry = 0; > int ret; > > - if (sdiodev->state == BRCMF_SDIOD_NOMEDIUM) > - return -ENOMEDIUM; > - > /* > * figure out how to read the register based on address range > * 0x00 ~ 0x7FF: function 0 CCCR and FBR > * 0x10000 ~ 0x1FFFF: function 1 miscellaneous registers > * The rest: function 1 silicon backplane core registers > + * f0 writes must be bytewise > */ > - if ((addr & ~REG_F0_REG_MASK) == 0) > - func = SDIO_FUNC_0; > - else > - func = SDIO_FUNC_1; > - > - do { > - /* for retry wait for 1 ms till bus get settled down */ > - if (retry) > - usleep_range(1000, 2000); > > - ret = brcmf_sdiod_request_data(sdiodev, func, addr, regsz, > - data, true); > - > - } while (ret != 0 && ret != -ENOMEDIUM && > - retry++ < SDIOH_API_ACCESS_RETRY_LIMIT); > + if ((addr & ~REG_F0_REG_MASK) == 0) { > + if (WARN_ON(regsz > 1)) > + return -EINVAL; > + ret = brcmf_sdiod_f0_writeb(sdiodev->func[0], *(u8 *)data, addr); > + } else { > + switch (regsz) { > + case 1: > + sdio_writeb(sdiodev->func[1], *(u8 *)data, addr, &ret); > + break; > + case 4: > + ret = brcmf_sdiod_addrprep(sdiodev, &addr); > + if (ret) > + goto done; > > - if (ret == -ENOMEDIUM) > - brcmf_sdiod_change_state(sdiodev, BRCMF_SDIOD_NOMEDIUM); > + sdio_writel(sdiodev->func[1], *(u32 *)data, addr, &ret); > + break; > + default: > + BUG(); Please do not use BUG() as it simply crashes the system. You may argue that we never reach this unless a coding mistake is made, but still we prefer WARN() over BUG() in such cases. > + ret = -EINVAL; > + break; > + } > + } > > +done: > return ret; > } > > static int brcmf_sdiod_reg_read(struct brcmf_sdio_dev *sdiodev, u32 addr, > u8 regsz, void *data) > { > - u8 func; > - s32 retry = 0; > int ret; > > - if (sdiodev->state == BRCMF_SDIOD_NOMEDIUM) > - return -ENOMEDIUM; > - > /* > * figure out how to read the register based on address range > * 0x00 ~ 0x7FF: function 0 CCCR and FBR > * 0x10000 ~ 0x1FFFF: function 1 miscellaneous registers > * The rest: function 1 silicon backplane core registers > + * f0 reads must be bytewise > */ > - if ((addr & ~REG_F0_REG_MASK) == 0) > - func = SDIO_FUNC_0; > - else > - func = SDIO_FUNC_1; > - > - do { > - memset(data, 0, regsz); > - > - /* for retry wait for 1 ms till bus get settled down */ > - if (retry) > - usleep_range(1000, 2000); > - > - ret = brcmf_sdiod_request_data(sdiodev, func, addr, regsz, > - data, false); > - > - } while (ret != 0 && ret != -ENOMEDIUM && > - retry++ < SDIOH_API_ACCESS_RETRY_LIMIT); > - > - if (ret == -ENOMEDIUM) > - brcmf_sdiod_change_state(sdiodev, BRCMF_SDIOD_NOMEDIUM); > - > - return ret; > -} > - > -static int > -brcmf_sdiod_set_sbaddr_window(struct brcmf_sdio_dev *sdiodev, u32 address) > -{ > - int err = 0, i; > - u32 addr; > - > - if (sdiodev->state == BRCMF_SDIOD_NOMEDIUM) > - return -ENOMEDIUM; > - > - addr = (address & SBSDIO_SBWINDOW_MASK) >> 8; > - > - for (i = 0 ; i < 3 && !err ; i++, addr >>= 8) > - brcmf_sdiod_regwb(sdiodev, SBSDIO_FUNC1_SBADDRLOW + i, > - addr & 0xff, &err); > - > - return err; > -} > - > -static int > -brcmf_sdiod_addrprep(struct brcmf_sdio_dev *sdiodev, u32 *addr) > -{ > - uint bar0 = *addr & ~SBSDIO_SB_OFT_ADDR_MASK; > - int err = 0; > - > - if (bar0 != sdiodev->sbwad) { > - err = brcmf_sdiod_set_sbaddr_window(sdiodev, bar0); > - if (err) > - return err; > + if ((addr & ~REG_F0_REG_MASK) == 0) { > + if (WARN_ON(regsz > 1)) > + return -EINVAL; > + *(u8 *)data = sdio_f0_readb(sdiodev->func[0], addr, &ret); > + } else { > + switch (regsz) { > + case 1: > + *(u8 *)data = sdio_readb(sdiodev->func[1], addr, &ret); > + break; > + case 4: > + ret = brcmf_sdiod_addrprep(sdiodev, &addr); > + if (ret) > + goto done; > > - sdiodev->sbwad = bar0; > + *(u32 *)data = sdio_readl(sdiodev->func[1], addr, &ret); > + break; > + default: > + BUG(); same here as with reg_write() function. > + ret = -EINVAL; > + break; > + } > } > > - *addr &= SBSDIO_SB_OFT_ADDR_MASK; > - *addr |= SBSDIO_SB_ACCESS_2_4B_FLAG; > - > - return 0; > +done: > + return ret; > } > > u8 brcmf_sdiod_regrb(struct brcmf_sdio_dev *sdiodev, u32 addr, int *ret) > @@ -439,15 +386,9 @@ u32 brcmf_sdiod_regrl(struct brcmf_sdio_dev *sdiodev, u32 addr, int *ret) > int retval; > > brcmf_dbg(SDIO, "addr:0x%08x\n", addr); > - retval = brcmf_sdiod_addrprep(sdiodev, &addr); > - if (retval) > - goto done; > - > - retval = brcmf_sdiod_reg_read(sdiodev, addr, 4, &data); > - > brcmf_dbg(SDIO, "data:0x%08x\n", data); Now this debug statement move before the actual read, which makes it useless. You are going to remove it in a subsequent patch, but still. > + retval = brcmf_sdiod_reg_read(sdiodev, addr, 4, &data); > > -done: > if (ret) > *ret = retval; >