| Message ID | 20191202222853.28783-1-linus.walleij@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v4] mmc: mmci: Support odd block sizes for ux500v2 and qcom variant | expand |
On Mon, 2 Dec 2019 at 23:28, Linus Walleij <linus.walleij@linaro.org> wrote: > > For the ux500v2 variant of the PL18x block, odd block sizes > are supported. This is necessary to support some SDIO > transfers. This also affects the QCOM MMCI variant and the > ST micro variant. > > For Ux500 an additional quirk only allowing DMA on blocks > that are a power of two is needed. This might be a bug in > the DMA engine (DMA40) or the MMCI or in the interconnect, > but the most likely is the MMCI, as transfers of these > sizes work fine for other devices using the same DMA > engine. DMA works fine also with SDIO as long as the > blocksize is a power of 2. > > This patch has proven necessary for enabling SDIO for WLAN on > PostmarketOS-based Ux500 platforms. > > What we managed to test in practice is Broadcom WiFi over > SDIO on the Ux500 based Samsung GT-I8190 and GT-S7710. > This WiFi chip, BCM4334 works fine after the patch. > > Before this patch: > > brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac4334-sdio > for chip BCM4334/3 > mmci-pl18x 80118000.sdi1_per2: unsupported block size (60 bytes) > brcmfmac: brcmf_sdiod_ramrw: membytes transfer failed > brcmfmac: brcmf_sdio_download_code_file: error -22 on writing > 434236 membytes at 0x00000000 > brcmfmac: brcmf_sdio_download_firmware: dongle image file download > failed > > After this patch: > > brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4334/3 wl0: > Nov 21 2012 00:21:28 version 6.10.58.813 (B2) FWID 01-0 > > Bringing up networks, discovering networks with "iw dev wlan0 scan" > and connecting works fine from this point. > > This patch is inspired by Ulf Hansson's patch > http://www.spinics.net/lists/linux-mmc/msg12160.html > > As the DMA engines on these platforms may now get block sizes > they were not used to before, make sure to also respect if > the DMA engine says "no" to a transfer. > > Make a drive-by fix for datactrl_blocksz, misspelled. Alright, I think this approach makes sense. Especially, trying to make some changes in mmci_pio_read|write() that we can trigger/test doesn't make sense. A few nitpicks below. > > Cc: Ludovic Barre <ludovic.barre@st.com> > Cc: Brian Masney <masneyb@onstation.org> > Cc: Stephan Gerhold <stephan@gerhold.net> > Cc: Niklas Cassel <niklas.cassel@linaro.org> > Cc: Russell King <rmk+kernel@armlinux.org.uk> > Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> > Signed-off-by: Linus Walleij <linus.walleij@linaro.org> > --- > ChangeLog v3->v4: > - Rewrite the patch to accept odd packages but only > let power of two packages pass on to the DMA. > - Drop the patches disallowing DMA not divisible by 4: > this doesn't work. Instead just push the whole > power of two criteria down to the DMA submission > phase. > - Drop the patch handling odd sglist offsets and > passing of page boundaries in SG buffers when > using PIO: it just doesn't happen in practice, we > don't know why, but likely because all packets are > small. > ChangeLog v2->v3: > - Repost with the inclusion of other patches. > ChangeLog v1->v2: > - Specify odd blocksize field to 1 bit (:1) > - Specify that STMMC supports odd block sizes > - Collect Stephan's test tag > --- [...] > diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h > index 833236ecb31e..37d02f147b4f 100644 > --- a/drivers/mmc/host/mmci.h > +++ b/drivers/mmc/host/mmci.h > @@ -278,7 +278,11 @@ struct mmci_host; > * @stm32_clkdiv: true if using a STM32-specific clock divider algorithm > * @datactrl_mask_ddrmode: ddr mode mask in datactrl register. > * @datactrl_mask_sdio: SDIO enable mask in datactrl register > - * @datactrl_blksz: block size in power of two > + * @datactrl_blocksz: block size in power of two > + * @datactrl_odd_blocksz: true if block any block sizes are accepted by > + * hardware, such as with some SDIO traffic that send > + * odd packets. > + * @only_pow_2_dma: DMA only works with blocks that are a power of 2. > * @datactrl_first: true if data must be setup before send command > * @datacnt_useless: true if you could not use datacnt register to read > * remaining data > @@ -323,6 +327,8 @@ struct variant_data { > unsigned int datactrl_mask_ddrmode; > unsigned int datactrl_mask_sdio; > unsigned int datactrl_blocksz; > + u8 datactrl_odd_blocksz:1; How about renaming this to datactrl_any_blocksz? As I think that better explains its purpose. > + u8 only_pow_2_dma:1; and rename this to dma_power_of_2 > u8 datactrl_first:1; > u8 datacnt_useless:1; > u8 st_sdio:1; > -- > 2.21.0 > Kind regards Uffe
On Wed, 11 Dec 2019 at 09:47, Ulf Hansson <ulf.hansson@linaro.org> wrote: > > On Mon, 2 Dec 2019 at 23:28, Linus Walleij <linus.walleij@linaro.org> wrote: > > > > For the ux500v2 variant of the PL18x block, odd block sizes > > are supported. This is necessary to support some SDIO > > transfers. This also affects the QCOM MMCI variant and the > > ST micro variant. > > > > For Ux500 an additional quirk only allowing DMA on blocks > > that are a power of two is needed. This might be a bug in > > the DMA engine (DMA40) or the MMCI or in the interconnect, > > but the most likely is the MMCI, as transfers of these > > sizes work fine for other devices using the same DMA > > engine. DMA works fine also with SDIO as long as the > > blocksize is a power of 2. > > > > This patch has proven necessary for enabling SDIO for WLAN on > > PostmarketOS-based Ux500 platforms. > > > > What we managed to test in practice is Broadcom WiFi over > > SDIO on the Ux500 based Samsung GT-I8190 and GT-S7710. > > This WiFi chip, BCM4334 works fine after the patch. > > > > Before this patch: > > > > brcmfmac: brcmf_fw_alloc_request: using brcm/brcmfmac4334-sdio > > for chip BCM4334/3 > > mmci-pl18x 80118000.sdi1_per2: unsupported block size (60 bytes) > > brcmfmac: brcmf_sdiod_ramrw: membytes transfer failed > > brcmfmac: brcmf_sdio_download_code_file: error -22 on writing > > 434236 membytes at 0x00000000 > > brcmfmac: brcmf_sdio_download_firmware: dongle image file download > > failed > > > > After this patch: > > > > brcmfmac: brcmf_c_preinit_dcmds: Firmware: BCM4334/3 wl0: > > Nov 21 2012 00:21:28 version 6.10.58.813 (B2) FWID 01-0 > > > > Bringing up networks, discovering networks with "iw dev wlan0 scan" > > and connecting works fine from this point. > > > > This patch is inspired by Ulf Hansson's patch > > http://www.spinics.net/lists/linux-mmc/msg12160.html > > > > As the DMA engines on these platforms may now get block sizes > > they were not used to before, make sure to also respect if > > the DMA engine says "no" to a transfer. > > > > Make a drive-by fix for datactrl_blocksz, misspelled. > > Alright, I think this approach makes sense. > > Especially, trying to make some changes in mmci_pio_read|write() that > we can trigger/test doesn't make sense. /s/can/can't [...] Kind regards Uffe
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c index c37e70dbe250..5afe9145f957 100644 --- a/drivers/mmc/host/mmci.c +++ b/drivers/mmc/host/mmci.c @@ -168,6 +168,8 @@ static struct variant_data variant_ux500 = { .cmdreg_srsp = MCI_CPSM_RESPONSE, .datalength_bits = 24, .datactrl_blocksz = 11, + .datactrl_odd_blocksz = true, + .only_pow_2_dma = true, .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN, .st_sdio = true, .st_clkdiv = true, @@ -201,6 +203,8 @@ static struct variant_data variant_ux500v2 = { .datactrl_mask_ddrmode = MCI_DPSM_ST_DDRMODE, .datalength_bits = 24, .datactrl_blocksz = 11, + .datactrl_odd_blocksz = true, + .only_pow_2_dma = true, .datactrl_mask_sdio = MCI_DPSM_ST_SDIOEN, .st_sdio = true, .st_clkdiv = true, @@ -260,6 +264,7 @@ static struct variant_data variant_stm32_sdmmc = { .datacnt_useless = true, .datalength_bits = 25, .datactrl_blocksz = 14, + .datactrl_odd_blocksz = true, .stm32_idmabsize_mask = GENMASK(12, 5), .init = sdmmc_variant_init, }; @@ -279,6 +284,7 @@ static struct variant_data variant_qcom = { .data_cmd_enable = MCI_CPSM_QCOM_DATCMD, .datalength_bits = 24, .datactrl_blocksz = 11, + .datactrl_odd_blocksz = true, .pwrreg_powerup = MCI_PWR_UP, .f_max = 208000000, .explicit_mclk_control = true, @@ -447,10 +453,11 @@ void mmci_dma_setup(struct mmci_host *host) static int mmci_validate_data(struct mmci_host *host, struct mmc_data *data) { + struct variant_data *variant = host->variant; + if (!data) return 0; - - if (!is_power_of_2(data->blksz)) { + if (!is_power_of_2(data->blksz) && !variant->datactrl_odd_blocksz) { dev_err(mmc_dev(host->mmc), "unsupported block size (%d bytes)\n", data->blksz); return -EINVAL; @@ -515,7 +522,9 @@ int mmci_dma_start(struct mmci_host *host, unsigned int datactrl) "Submit MMCI DMA job, sglen %d blksz %04x blks %04x flags %08x\n", data->sg_len, data->blksz, data->blocks, data->flags); - host->ops->dma_start(host, &datactrl); + ret = host->ops->dma_start(host, &datactrl); + if (ret) + return ret; /* Trigger the DMA transfer */ mmci_write_datactrlreg(host, datactrl); @@ -822,6 +831,18 @@ static int _mmci_dmae_prep_data(struct mmci_host *host, struct mmc_data *data, if (data->blksz * data->blocks <= variant->fifosize) return -EINVAL; + /* + * This is necessary to get SDIO working on the Ux500. We do not yet + * know if this is a bug in: + * - The Ux500 DMA controller (DMA40) + * - The MMCI DMA interface on the Ux500 + * some power of two blocks (such as 64 bytes) are sent regularly + * during SDIO traffic and those work fine so for these we enable DMA + * transfers. + */ + if (host->variant->only_pow_2_dma && !is_power_of_2(data->blksz)) + return -EINVAL; + device = chan->device; nr_sg = dma_map_sg(device->dev, data->sg, data->sg_len, mmc_get_dma_dir(data)); @@ -872,9 +893,14 @@ int mmci_dmae_prep_data(struct mmci_host *host, int mmci_dmae_start(struct mmci_host *host, unsigned int *datactrl) { struct mmci_dmae_priv *dmae = host->dma_priv; + int ret; host->dma_in_progress = true; - dmaengine_submit(dmae->desc_current); + ret = dma_submit_error(dmaengine_submit(dmae->desc_current)); + if (ret < 0) { + host->dma_in_progress = false; + return ret; + } dma_async_issue_pending(dmae->cur); *datactrl |= MCI_DPSM_DMAENABLE; diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h index 833236ecb31e..37d02f147b4f 100644 --- a/drivers/mmc/host/mmci.h +++ b/drivers/mmc/host/mmci.h @@ -278,7 +278,11 @@ struct mmci_host; * @stm32_clkdiv: true if using a STM32-specific clock divider algorithm * @datactrl_mask_ddrmode: ddr mode mask in datactrl register. * @datactrl_mask_sdio: SDIO enable mask in datactrl register - * @datactrl_blksz: block size in power of two + * @datactrl_blocksz: block size in power of two + * @datactrl_odd_blocksz: true if block any block sizes are accepted by + * hardware, such as with some SDIO traffic that send + * odd packets. + * @only_pow_2_dma: DMA only works with blocks that are a power of 2. * @datactrl_first: true if data must be setup before send command * @datacnt_useless: true if you could not use datacnt register to read * remaining data @@ -323,6 +327,8 @@ struct variant_data { unsigned int datactrl_mask_ddrmode; unsigned int datactrl_mask_sdio; unsigned int datactrl_blocksz; + u8 datactrl_odd_blocksz:1; + u8 only_pow_2_dma:1; u8 datactrl_first:1; u8 datacnt_useless:1; u8 st_sdio:1;