From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ulf Hansson Subject: Re: [PATCH 2/3] [2/3] mmc: mediatek: command queue support Date: Mon, 11 Nov 2019 14:37:53 +0100 Message-ID: References: <1572590582-11056-1-git-send-email-chun-hung.wu@mediatek.com> <1572590582-11056-2-git-send-email-chun-hung.wu@mediatek.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Return-path: In-Reply-To: <1572590582-11056-2-git-send-email-chun-hung.wu@mediatek.com> Sender: linux-kernel-owner@vger.kernel.org To: Chun-Hung Wu Cc: Chaotian Jing , Matthias Brugger , Pan Bian , Stanley Chu , Kuohong Wang , Linux Kernel Mailing List , "linux-mmc@vger.kernel.org" , linux-mediatek@lists.infradead.org, wsd_upstream@mediatek.com, Linux ARM List-Id: linux-mmc@vger.kernel.org + Trimmed cc list (please do that as well for your next submission). On Fri, 1 Nov 2019 at 07:43, Chun-Hung Wu wrote: > > Support command queue for mt6779 platform. A lot of changes summarized on only one line. I would appreciate some more information here, please. > > Change-Id: I56b866fa4097a3c0bee77f53486c470e4f1944b9 > Feature: Drop these please. > Signed-off-by: Chun-Hung Wu For the next submission, please add the maintainers for the cqhci driver. They may have some valuable feedback for you. Below follows a few review comments, which are more from a patch formatting point of view, than technical. > --- > drivers/mmc/host/mtk-sd.c | 151 +++++++++++++++++++++++++++++++++++++++++++--- > 1 file changed, 141 insertions(+), 10 deletions(-) > > diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c > index 189e426..b132397 100644 > --- a/drivers/mmc/host/mtk-sd.c > +++ b/drivers/mmc/host/mtk-sd.c > @@ -31,6 +31,8 @@ > #include > #include > > +#include "cqhci.h" > + > #define MAX_BD_NUM 1024 > > /*--------------------------------------------------------------------------*/ > @@ -151,6 +153,7 @@ > #define MSDC_INT_DMA_BDCSERR (0x1 << 17) /* W1C */ > #define MSDC_INT_DMA_GPDCSERR (0x1 << 18) /* W1C */ > #define MSDC_INT_DMA_PROTECT (0x1 << 19) /* W1C */ > +#define MSDC_INT_CMDQ (0x1 << 28) /* W1C */ > > /* MSDC_INTEN mask */ > #define MSDC_INTEN_MMCIRQ (0x1 << 0) /* RW */ > @@ -181,6 +184,7 @@ > /* SDC_CFG mask */ > #define SDC_CFG_SDIOINTWKUP (0x1 << 0) /* RW */ > #define SDC_CFG_INSWKUP (0x1 << 1) /* RW */ > +#define SDC_CFG_WRDTOC (0x1fff << 2) /* RW */ > #define SDC_CFG_BUSWIDTH (0x3 << 16) /* RW */ > #define SDC_CFG_SDIO (0x1 << 19) /* RW */ > #define SDC_CFG_SDIOIDE (0x1 << 20) /* RW */ > @@ -228,6 +232,7 @@ > #define MSDC_PATCH_BIT_SPCPUSH (0x1 << 29) /* RW */ > #define MSDC_PATCH_BIT_DECRCTMO (0x1 << 30) /* RW */ > > +#define MSDC_PB1_BUSY_CHECK_SEL (0x1 << 7) /* RW */ > #define MSDC_PATCH_BIT1_STOP_DLY (0xf << 8) /* RW */ > > #define MSDC_PATCH_BIT2_CFGRESP (0x1 << 15) /* RW */ > @@ -431,6 +436,7 @@ struct msdc_host { > struct msdc_save_para save_para; /* used when gate HCLK */ > struct msdc_tune_para def_tune_para; /* default tune setting */ > struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */ > + struct cqhci_host *cq_host; > }; > > static const struct mtk_mmc_compatible mt8135_compat = { > @@ -527,6 +533,18 @@ struct msdc_host { > .use_internal_cd = true, > }; > > +static const struct mtk_mmc_compatible mt6779_compat = { > + .clk_div_bits = 12, > + .hs400_tune = false, > + .pad_tune_reg = MSDC_PAD_TUNE0, > + .async_fifo = true, > + .data_tune = true, > + .busy_check = true, > + .stop_clk_fix = true, > + .enhance_rx = true, > + .support_64g = true, > +}; > + > static const struct of_device_id msdc_of_ids[] = { > { .compatible = "mediatek,mt8135-mmc", .data = &mt8135_compat}, > { .compatible = "mediatek,mt8173-mmc", .data = &mt8173_compat}, > @@ -536,6 +554,7 @@ struct msdc_host { > { .compatible = "mediatek,mt7622-mmc", .data = &mt7622_compat}, > { .compatible = "mediatek,mt8516-mmc", .data = &mt8516_compat}, > { .compatible = "mediatek,mt7620-mmc", .data = &mt7620_compat}, > + { .compatible = "mediatek,mt6779-mmc", .data = &mt6779_compat}, > {} > }; > MODULE_DEVICE_TABLE(of, msdc_of_ids); > @@ -698,21 +717,21 @@ static void msdc_unprepare_data(struct msdc_host *host, struct mmc_request *mrq) > } > } > > -/* clock control primitives */ > -static void msdc_set_timeout(struct msdc_host *host, u32 ns, u32 clks) > +static u64 msdc_timeout_cal(struct msdc_host *host, u64 ns, u64 clks) > { > - u32 timeout, clk_ns; > + u64 timeout, clk_ns; > u32 mode = 0; > > - host->timeout_ns = ns; > - host->timeout_clks = clks; > if (host->mmc->actual_clock == 0) { > timeout = 0; > } else { > - clk_ns = 1000000000UL / host->mmc->actual_clock; > - timeout = (ns + clk_ns - 1) / clk_ns + clks; > + clk_ns = 1000000000ULL; > + do_div(clk_ns, host->mmc->actual_clock); > + timeout = ns + clk_ns - 1; > + do_div(timeout, clk_ns); > + timeout += clks; > /* in 1048576 sclk cycle unit */ > - timeout = (timeout + (0x1 << 20) - 1) >> 20; > + timeout = DIV_ROUND_UP(timeout, (0x1 << 20)); > if (host->dev_comp->clk_div_bits == 8) > sdr_get_field(host->base + MSDC_CFG, > MSDC_CFG_CKMOD, &mode); > @@ -722,9 +741,30 @@ static void msdc_set_timeout(struct msdc_host *host, u32 ns, u32 clks) > /*DDR mode will double the clk cycles for data timeout */ > timeout = mode >= 2 ? timeout * 2 : timeout; > timeout = timeout > 1 ? timeout - 1 : 0; > - timeout = timeout > 255 ? 255 : timeout; > } > - sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, timeout); > + return timeout; > +} > + > +/* clock control primitives */ > +static void msdc_set_timeout(struct msdc_host *host, u64 ns, u64 clks) > +{ > + u64 timeout; > + > + host->timeout_ns = ns; > + host->timeout_clks = clks; > + > + timeout = msdc_timeout_cal(host, ns, clks); > + sdr_set_field(host->base + SDC_CFG, SDC_CFG_DTOC, > + (u32)(timeout > 255 ? 255 : timeout)); > +} Does the above changes make sense to split out in a separate patch? It looks to me, that these are generic clock updates to the driver that really doesn't have to be included in $subject patch. > + > +static void msdc_set_busy_timeout(struct msdc_host *host, u64 ns, u64 clks) > +{ > + u64 timeout; > + > + timeout = msdc_timeout_cal(host, ns, clks); > + sdr_set_field(host->base + SDC_CFG, SDC_CFG_WRDTOC, > + (u32)(timeout > 8191 ? 8191 : timeout)); > } > > static void msdc_gate_clock(struct msdc_host *host) > @@ -1413,6 +1453,36 @@ static void msdc_enable_sdio_irq(struct mmc_host *mmc, int enb) > pm_runtime_put_noidle(host->dev); > } > > +#if IS_ENABLED(CONFIG_MMC_CQHCI) Other drivers Kconfig option, uses "select MMC_CQHCI". Would that make this more simple and allowing to remove the "if IS_ENABLED" thingy? > +static irqreturn_t msdc_cmdq_irq(struct msdc_host *host, u32 intsts) > +{ > + int cmd_err = 0, dat_err = 0; > + > + if (intsts & MSDC_INT_RSPCRCERR) { > + cmd_err = (unsigned int)-EILSEQ; > + dev_err(host->dev, "%s: CMD CRC ERR", __func__); > + } else if (intsts & MSDC_INT_CMDTMO) { > + cmd_err = (unsigned int)-ETIMEDOUT; > + dev_err(host->dev, "%s: CMD TIMEOUT ERR", __func__); > + } > + > + if (intsts & MSDC_INT_DATCRCERR) { > + dat_err = (unsigned int)-EILSEQ; > + dev_err(host->dev, "%s: DATA CRC ERR", __func__); > + } else if (intsts & MSDC_INT_DATTMO) { > + dat_err = (unsigned int)-ETIMEDOUT; > + dev_err(host->dev, "%s: DATA TIMEOUT ERR", __func__); > + } > + > + if (cmd_err || dat_err) { > + dev_err(host->dev, "cmd_err = %d, dat_err =%d, intsts = 0x%x", > + cmd_err, dat_err, intsts); > + } > + > + return cqhci_irq(host->mmc, 0, cmd_err, dat_err); > +} > +#endif > + > static irqreturn_t msdc_irq(int irq, void *dev_id) > { > struct msdc_host *host = (struct msdc_host *) dev_id; > @@ -1449,6 +1519,16 @@ static irqreturn_t msdc_irq(int irq, void *dev_id) > if (!(events & (event_mask & ~MSDC_INT_SDIOIRQ))) > break; > > +#if IS_ENABLED(CONFIG_MMC_CQHCI) Again, please to avoid these "IS_ENABLED". > + if ((host->mmc->caps2 & MMC_CAP2_CQE) && > + (events & MSDC_INT_CMDQ)) { > + msdc_cmdq_irq(host, events); > + /* clear interrupts */ > + writel(events, host->base + MSDC_INT); > + return IRQ_HANDLED; > + } > +#endif > + > if (!mrq) { > dev_err(host->dev, > "%s: MRQ=NULL; events=%08X; event_mask=%08X\n", > @@ -2132,6 +2212,36 @@ static int msdc_get_cd(struct mmc_host *mmc) > return !val; > } > > +static void msdc_cqe_enable(struct mmc_host *mmc) > +{ > + struct msdc_host *host = mmc_priv(mmc); > + > + /* enable cmdq irq */ > + writel(MSDC_INT_CMDQ, host->base + MSDC_INTEN); > + /* enable busy check */ > + sdr_set_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL); > + /* default write data / busy timeout 20s */ > + msdc_set_busy_timeout(host, 20 * 1000000000ULL, 0); > + /* default read data timeout 1s */ > + msdc_set_timeout(host, 1000000000ULL, 0); Some magic timeout values here. Can you elaborate why these values? > +} > + > +void msdc_cqe_disable(struct mmc_host *mmc, bool recovery) > +{ > + struct msdc_host *host = mmc_priv(mmc); > + > + /* disable cmdq irq */ > + sdr_clr_bits(host->base + MSDC_INTEN, MSDC_INT_CMDQ); > + /* disable busy check */ > + sdr_clr_bits(host->base + MSDC_PATCH_BIT1, MSDC_PB1_BUSY_CHECK_SEL); > + > + if (recovery) { > + sdr_set_field(host->base + MSDC_DMA_CTRL, > + MSDC_DMA_CTRL_STOP, 1); > + msdc_reset_hw(host); > + } > +} > + > static const struct mmc_host_ops mt_msdc_ops = { > .post_req = msdc_post_req, > .pre_req = msdc_pre_req, > @@ -2148,6 +2258,11 @@ static int msdc_get_cd(struct mmc_host *mmc) > .hw_reset = msdc_hw_reset, The hw_reset callback is really for resetting the card, but it seems like you are using it to reset the controller. No? I notice there are some other drivers abusing the callback as well, but I am wondering whether it's time to really look into what's going on here. Can you elaborate on why you need this? > }; > > +static const struct cqhci_host_ops msdc_cmdq_ops = { > + .enable = msdc_cqe_enable, > + .disable = msdc_cqe_disable, > +}; > + > static void msdc_of_property_parse(struct platform_device *pdev, > struct msdc_host *host) > { > @@ -2299,6 +2414,22 @@ static int msdc_drv_probe(struct platform_device *pdev) > host->dma_mask = DMA_BIT_MASK(32); > mmc_dev(mmc)->dma_mask = &host->dma_mask; > > +#if IS_ENABLED(CONFIG_MMC_CQHCI) > + if (mmc->caps2 & MMC_CAP2_CQE) { > + host->cq_host = devm_kzalloc(host->mmc->parent, > + sizeof(*host->cq_host), > + GFP_KERNEL); > + host->cq_host->caps |= CQHCI_TASK_DESC_SZ_128; > + host->cq_host->mmio = host->base + 0x800; > + host->cq_host->ops = &msdc_cmdq_ops; > + cqhci_init(host->cq_host, mmc, true); > + mmc->max_segs = 128; > + /* cqhci 16bit length */ > + /* 0 size, means 65536 so we don't have to -1 here */ > + mmc->max_seg_size = 64 * 1024; > + } > +#endif > + > host->timeout_clks = 3 * 1048576; > host->dma.gpd = dma_alloc_coherent(&pdev->dev, > 2 * sizeof(struct mt_gpdma_desc), > -- > 1.9.1 > Kind regards Uffe