On Tue, Dec 17, 2019 at 03:39:52PM +0100, Linus Walleij 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. > > Cc: Ludovic Barre <ludovic.barre@xxxxxx> > Cc: Brian Masney <masneyb@xxxxxxxxxxxxx> > Cc: Stephan Gerhold <stephan@xxxxxxxxxxx> > Cc: Niklas Cassel <niklas.cassel@xxxxxxxxxx> > Cc: Russell King <rmk+kernel@xxxxxxxxxxxxxxx> > Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx> > Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@xxxxxxxxxx> > Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> Thanks for the patch! Tested this patch on samsung,golden (GT-I8190) and it seems to be working fine for brcmfmac with and without DMA: Tested-by: Stephan Gerhold <stephan@xxxxxxxxxxx> Note: The patch does not seem to apply cleanly to mainline (5.5-rc2) or mmc/next at the moment, although git am --3way did the job without any conflicts. > --- > ChangeLog v5->v6: > - Actually commit the changes I have in my tree > and resend... We now have the config members > datactrl_any_blocksz and dma_power_of_2 as intended. > ChangeLog v4->v5: > - Rename variant members as Ulf want them. > 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 > --- > drivers/mmc/host/mmci.c | 34 ++++++++++++++++++++++++++++++---- > drivers/mmc/host/mmci.h | 8 +++++++- > 2 files changed, 37 insertions(+), 5 deletions(-) > > diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c > index c37e70dbe250..7e4bc9124efd 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_any_blocksz = true, > + .dma_power_of_2 = 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_any_blocksz = true, > + .dma_power_of_2 = 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_any_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_any_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_any_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->dma_power_of_2 && !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..89ab73343cf3 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_any_blocksz: true if block any block sizes are accepted by > + * hardware, such as with some SDIO traffic that send > + * odd packets. > + * @dma_power_of_2: 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_any_blocksz:1; > + u8 dma_power_of_2:1; > u8 datactrl_first:1; > u8 datacnt_useless:1; > u8 st_sdio:1; > -- > 2.21.0 >
