| Message ID | 1401323709-10345-1-git-send-email-sonnyrao@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Hi, Sonny. On 05/29/2014 09:35 AM, Sonny Rao wrote: > This patch changes the fifo reset code to follow the reset procedure > outlined in the documentation of Synopsys Mobile storage host databook. > > Signed-off-by: Sonny Rao <sonnyrao@chromium.org> > Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com> > --- > v2: Add Generic DMA support > per the documentation, move interrupt clear before wait > make the test for DMA host->use_dma rather than host->using_dma > add proper return values (although it appears no caller checks) > v3: rename fifo reset function, and change callers > use this combined reset function in dw_mci_resume() > just one caller left (probe), so get rid of dw_mci_ctrl_all_reset() > use DMA reset bit for all systems which use DMA > remove extra IDMAC reset in dw_mci_work_routine_card() > do CIU clock update in error path, if CIU reset cleared > > drivers/mmc/host/dw_mmc.c | 85 +++++++++++++++++++++++++++++++++++------------ > drivers/mmc/host/dw_mmc.h | 1 + > 2 files changed, 64 insertions(+), 22 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index 55cd110..988492c 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -111,8 +111,7 @@ static const u8 tuning_blk_pattern_8bit[] = { > 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, > }; > > -static inline bool dw_mci_fifo_reset(struct dw_mci *host); > -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host); > +static inline bool dw_mci_reset(struct dw_mci *host); > > #if defined(CONFIG_DEBUG_FS) > static int dw_mci_req_show(struct seq_file *s, void *v) > @@ -1254,7 +1253,7 @@ static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data) > * After an error, there may be data lingering > * in the FIFO > */ > - dw_mci_fifo_reset(host); > + dw_mci_reset(host); > } else { > data->bytes_xfered = data->blocks * data->blksz; > data->error = 0; > @@ -1371,7 +1370,7 @@ static void dw_mci_tasklet_func(unsigned long priv) > > /* CMD error in data command */ > if (mrq->cmd->error && mrq->data) > - dw_mci_fifo_reset(host); > + dw_mci_reset(host); > > host->cmd = NULL; > host->data = NULL; > @@ -1982,14 +1981,9 @@ static void dw_mci_work_routine_card(struct work_struct *work) > } > > /* Power down slot */ > - if (present == 0) { > + if (present == 0) > /* Clear down the FIFO */ Didn't Need to change the Comment? > - dw_mci_fifo_reset(host); > -#ifdef CONFIG_MMC_DW_IDMAC > - dw_mci_idmac_reset(host); > -#endif > - > - } > + dw_mci_reset(host); > > spin_unlock_bh(&host->lock); > > @@ -2323,8 +2317,11 @@ static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset) > return false; > } > > -static inline bool dw_mci_fifo_reset(struct dw_mci *host) > +static inline bool dw_mci_reset(struct dw_mci *host) > { > + u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET; > + bool ret = false; > + > /* > * Reseting generates a block interrupt, hence setting > * the scatter-gather pointer to NULL. > @@ -2334,15 +2331,57 @@ static inline bool dw_mci_fifo_reset(struct dw_mci *host) > host->sg = NULL; > } > > - return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET); > -} > + if (host->use_dma) > + flags |= SDMMC_CTRL_DMA_RESET; > > -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host) > -{ > - return dw_mci_ctrl_reset(host, > - SDMMC_CTRL_FIFO_RESET | > - SDMMC_CTRL_RESET | > - SDMMC_CTRL_DMA_RESET); > + if (dw_mci_ctrl_reset(host, flags)) { > + /* > + * In all cases we clear the RAWINTS register to clear any > + * interrupts. > + */ > + mci_writel(host, RINTSTS, 0xFFFFFFFF); > + > + /* if using dma we wait for dma_req to clear */ > + if (host->use_dma) { > + unsigned long timeout = jiffies + msecs_to_jiffies(500); > + u32 status; > + do { > + status = mci_readl(host, STATUS); > + if (!(status & SDMMC_STATUS_DMA_REQ)) > + break; > + cpu_relax(); > + } while (time_before(jiffies, timeout)); > + > + if (status & SDMMC_STATUS_DMA_REQ) { > + dev_err(host->dev, > + "%s: Timeout waiting for dma_req to " > + "clear during reset", __func__); > + goto ciu_out; > + } > + > + /* when using DMA next we reset the fifo again */ > + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET)) > + goto ciu_out; > + } > + } else { > + dev_err(host->dev, "%s: Reset bits didn't clear", __func__); > + > + /* if the controller reset bit did clear, then set clock regs */ I have some confusion at this point. you added the above error message "Reset bits didn't clear". But this comment is "if the controller reset bit did clear..". I think that dev_err message would be better to locate into "if (!(mci_read(host, CTRL) & ...)". > + if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) > + goto ciu_out; > + } > + > + if (IS_ENABLED(CONFIG_MMC_DW_IDMAC)) > + /* It is also recommended that we reset and reprogram idmac */ > + dw_mci_idmac_reset(host); > + > + ret = true; > + > +ciu_out: > + /* After a CTRL reset we need to have CIU set clock registers */ > + mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0); > + > + return ret; > } > > #ifdef CONFIG_OF > @@ -2432,6 +2471,7 @@ int dw_mci_probe(struct dw_mci *host) > const struct dw_mci_drv_data *drv_data = host->drv_data; > int width, i, ret = 0; > u32 fifo_size; > + u32 flags; > int init_slots = 0; > > if (!host->pdata) { > @@ -2555,7 +2595,8 @@ int dw_mci_probe(struct dw_mci *host) > } > > /* Reset all blocks */ > - if (!dw_mci_ctrl_all_reset(host)) > + flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET; how about adding the SDMMC_CTRL_ALL_RESET macro into header file? #define SDMMC_CTRL_ALL_RESET (.....) > + if (!dw_mci_ctrl_reset(host, flags)) > return -ENODEV; > > host->dma_ops = host->pdata->dma_ops; > @@ -2744,7 +2785,7 @@ int dw_mci_resume(struct dw_mci *host) > } > } > > - if (!dw_mci_ctrl_all_reset(host)) { > + if (!dw_mci_reset(host)) { > ret = -ENODEV; > return ret; > } > diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h > index 6bf24ab..2505804 100644 > --- a/drivers/mmc/host/dw_mmc.h > +++ b/drivers/mmc/host/dw_mmc.h > @@ -129,6 +129,7 @@ > #define SDMMC_CMD_INDX(n) ((n) & 0x1F) > /* Status register defines */ > #define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF) > +#define SDMMC_STATUS_DMA_REQ BIT(31) > /* FIFOTH register defines */ > #define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \ > ((r) & 0xFFF) << 16 | \ > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Wed, May 28, 2014 at 10:17 PM, Jaehoon Chung <jh80.chung@samsung.com> wrote: > Hi, Sonny. > > On 05/29/2014 09:35 AM, Sonny Rao wrote: >> This patch changes the fifo reset code to follow the reset procedure >> outlined in the documentation of Synopsys Mobile storage host databook. >> >> Signed-off-by: Sonny Rao <sonnyrao@chromium.org> >> Signed-off-by: Yuvaraj Kumar C D <yuvaraj.cd@samsung.com> >> --- >> v2: Add Generic DMA support >> per the documentation, move interrupt clear before wait >> make the test for DMA host->use_dma rather than host->using_dma >> add proper return values (although it appears no caller checks) >> v3: rename fifo reset function, and change callers >> use this combined reset function in dw_mci_resume() >> just one caller left (probe), so get rid of dw_mci_ctrl_all_reset() >> use DMA reset bit for all systems which use DMA >> remove extra IDMAC reset in dw_mci_work_routine_card() >> do CIU clock update in error path, if CIU reset cleared >> >> drivers/mmc/host/dw_mmc.c | 85 +++++++++++++++++++++++++++++++++++------------ >> drivers/mmc/host/dw_mmc.h | 1 + >> 2 files changed, 64 insertions(+), 22 deletions(-) >> >> diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c >> index 55cd110..988492c 100644 >> --- a/drivers/mmc/host/dw_mmc.c >> +++ b/drivers/mmc/host/dw_mmc.c >> @@ -111,8 +111,7 @@ static const u8 tuning_blk_pattern_8bit[] = { >> 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, >> }; >> >> -static inline bool dw_mci_fifo_reset(struct dw_mci *host); >> -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host); >> +static inline bool dw_mci_reset(struct dw_mci *host); >> >> #if defined(CONFIG_DEBUG_FS) >> static int dw_mci_req_show(struct seq_file *s, void *v) >> @@ -1254,7 +1253,7 @@ static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data) >> * After an error, there may be data lingering >> * in the FIFO >> */ >> - dw_mci_fifo_reset(host); >> + dw_mci_reset(host); >> } else { >> data->bytes_xfered = data->blocks * data->blksz; >> data->error = 0; >> @@ -1371,7 +1370,7 @@ static void dw_mci_tasklet_func(unsigned long priv) >> >> /* CMD error in data command */ >> if (mrq->cmd->error && mrq->data) >> - dw_mci_fifo_reset(host); >> + dw_mci_reset(host); >> >> host->cmd = NULL; >> host->data = NULL; >> @@ -1982,14 +1981,9 @@ static void dw_mci_work_routine_card(struct work_struct *work) >> } >> >> /* Power down slot */ >> - if (present == 0) { >> + if (present == 0) >> /* Clear down the FIFO */ > Didn't Need to change the Comment? Well, it does still clear the fifo, but I can remove the comment since we are now doing more than that. >> - dw_mci_fifo_reset(host); >> -#ifdef CONFIG_MMC_DW_IDMAC >> - dw_mci_idmac_reset(host); >> -#endif >> - >> - } >> + dw_mci_reset(host); >> >> spin_unlock_bh(&host->lock); >> >> @@ -2323,8 +2317,11 @@ static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset) >> return false; >> } >> >> -static inline bool dw_mci_fifo_reset(struct dw_mci *host) >> +static inline bool dw_mci_reset(struct dw_mci *host) >> { >> + u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET; >> + bool ret = false; >> + >> /* >> * Reseting generates a block interrupt, hence setting >> * the scatter-gather pointer to NULL. >> @@ -2334,15 +2331,57 @@ static inline bool dw_mci_fifo_reset(struct dw_mci *host) >> host->sg = NULL; >> } >> >> - return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET); >> -} >> + if (host->use_dma) >> + flags |= SDMMC_CTRL_DMA_RESET; >> >> -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host) >> -{ >> - return dw_mci_ctrl_reset(host, >> - SDMMC_CTRL_FIFO_RESET | >> - SDMMC_CTRL_RESET | >> - SDMMC_CTRL_DMA_RESET); >> + if (dw_mci_ctrl_reset(host, flags)) { >> + /* >> + * In all cases we clear the RAWINTS register to clear any >> + * interrupts. >> + */ >> + mci_writel(host, RINTSTS, 0xFFFFFFFF); >> + >> + /* if using dma we wait for dma_req to clear */ >> + if (host->use_dma) { >> + unsigned long timeout = jiffies + msecs_to_jiffies(500); >> + u32 status; >> + do { >> + status = mci_readl(host, STATUS); >> + if (!(status & SDMMC_STATUS_DMA_REQ)) >> + break; >> + cpu_relax(); >> + } while (time_before(jiffies, timeout)); >> + >> + if (status & SDMMC_STATUS_DMA_REQ) { >> + dev_err(host->dev, >> + "%s: Timeout waiting for dma_req to " >> + "clear during reset", __func__); >> + goto ciu_out; >> + } >> + >> + /* when using DMA next we reset the fifo again */ >> + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET)) >> + goto ciu_out; >> + } >> + } else { >> + dev_err(host->dev, "%s: Reset bits didn't clear", __func__); >> + >> + /* if the controller reset bit did clear, then set clock regs */ > I have some confusion at this point. you added the above error message "Reset bits didn't clear". > But this comment is "if the controller reset bit did clear..". > > I think that dev_err message would be better to locate into "if (!(mci_read(host, CTRL) & ...)". > Ok, I'll move this error message inside the if block and make it more specific. >> + if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) >> + goto ciu_out; >> + } >> + >> + if (IS_ENABLED(CONFIG_MMC_DW_IDMAC)) >> + /* It is also recommended that we reset and reprogram idmac */ >> + dw_mci_idmac_reset(host); >> + >> + ret = true; >> + >> +ciu_out: >> + /* After a CTRL reset we need to have CIU set clock registers */ >> + mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0); >> + >> + return ret; >> } >> >> #ifdef CONFIG_OF >> @@ -2432,6 +2471,7 @@ int dw_mci_probe(struct dw_mci *host) >> const struct dw_mci_drv_data *drv_data = host->drv_data; >> int width, i, ret = 0; >> u32 fifo_size; >> + u32 flags; >> int init_slots = 0; >> >> if (!host->pdata) { >> @@ -2555,7 +2595,8 @@ int dw_mci_probe(struct dw_mci *host) >> } >> >> /* Reset all blocks */ >> - if (!dw_mci_ctrl_all_reset(host)) >> + flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET; > how about adding the SDMMC_CTRL_ALL_RESET macro into header file? > #define SDMMC_CTRL_ALL_RESET (.....) > ok I'll make a macro in dw_mmc.h for this. >> + if (!dw_mci_ctrl_reset(host, flags)) >> return -ENODEV; >> >> host->dma_ops = host->pdata->dma_ops; >> @@ -2744,7 +2785,7 @@ int dw_mci_resume(struct dw_mci *host) >> } >> } >> >> - if (!dw_mci_ctrl_all_reset(host)) { >> + if (!dw_mci_reset(host)) { >> ret = -ENODEV; >> return ret; >> } >> diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h >> index 6bf24ab..2505804 100644 >> --- a/drivers/mmc/host/dw_mmc.h >> +++ b/drivers/mmc/host/dw_mmc.h >> @@ -129,6 +129,7 @@ >> #define SDMMC_CMD_INDX(n) ((n) & 0x1F) >> /* Status register defines */ >> #define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF) >> +#define SDMMC_STATUS_DMA_REQ BIT(31) >> /* FIFOTH register defines */ >> #define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \ >> ((r) & 0xFFF) << 16 | \ >> > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 55cd110..988492c 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -111,8 +111,7 @@ static const u8 tuning_blk_pattern_8bit[] = { 0xff, 0x77, 0x77, 0xff, 0x77, 0xbb, 0xdd, 0xee, }; -static inline bool dw_mci_fifo_reset(struct dw_mci *host); -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host); +static inline bool dw_mci_reset(struct dw_mci *host); #if defined(CONFIG_DEBUG_FS) static int dw_mci_req_show(struct seq_file *s, void *v) @@ -1254,7 +1253,7 @@ static int dw_mci_data_complete(struct dw_mci *host, struct mmc_data *data) * After an error, there may be data lingering * in the FIFO */ - dw_mci_fifo_reset(host); + dw_mci_reset(host); } else { data->bytes_xfered = data->blocks * data->blksz; data->error = 0; @@ -1371,7 +1370,7 @@ static void dw_mci_tasklet_func(unsigned long priv) /* CMD error in data command */ if (mrq->cmd->error && mrq->data) - dw_mci_fifo_reset(host); + dw_mci_reset(host); host->cmd = NULL; host->data = NULL; @@ -1982,14 +1981,9 @@ static void dw_mci_work_routine_card(struct work_struct *work) } /* Power down slot */ - if (present == 0) { + if (present == 0) /* Clear down the FIFO */ - dw_mci_fifo_reset(host); -#ifdef CONFIG_MMC_DW_IDMAC - dw_mci_idmac_reset(host); -#endif - - } + dw_mci_reset(host); spin_unlock_bh(&host->lock); @@ -2323,8 +2317,11 @@ static bool dw_mci_ctrl_reset(struct dw_mci *host, u32 reset) return false; } -static inline bool dw_mci_fifo_reset(struct dw_mci *host) +static inline bool dw_mci_reset(struct dw_mci *host) { + u32 flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET; + bool ret = false; + /* * Reseting generates a block interrupt, hence setting * the scatter-gather pointer to NULL. @@ -2334,15 +2331,57 @@ static inline bool dw_mci_fifo_reset(struct dw_mci *host) host->sg = NULL; } - return dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET); -} + if (host->use_dma) + flags |= SDMMC_CTRL_DMA_RESET; -static inline bool dw_mci_ctrl_all_reset(struct dw_mci *host) -{ - return dw_mci_ctrl_reset(host, - SDMMC_CTRL_FIFO_RESET | - SDMMC_CTRL_RESET | - SDMMC_CTRL_DMA_RESET); + if (dw_mci_ctrl_reset(host, flags)) { + /* + * In all cases we clear the RAWINTS register to clear any + * interrupts. + */ + mci_writel(host, RINTSTS, 0xFFFFFFFF); + + /* if using dma we wait for dma_req to clear */ + if (host->use_dma) { + unsigned long timeout = jiffies + msecs_to_jiffies(500); + u32 status; + do { + status = mci_readl(host, STATUS); + if (!(status & SDMMC_STATUS_DMA_REQ)) + break; + cpu_relax(); + } while (time_before(jiffies, timeout)); + + if (status & SDMMC_STATUS_DMA_REQ) { + dev_err(host->dev, + "%s: Timeout waiting for dma_req to " + "clear during reset", __func__); + goto ciu_out; + } + + /* when using DMA next we reset the fifo again */ + if (!dw_mci_ctrl_reset(host, SDMMC_CTRL_FIFO_RESET)) + goto ciu_out; + } + } else { + dev_err(host->dev, "%s: Reset bits didn't clear", __func__); + + /* if the controller reset bit did clear, then set clock regs */ + if (!(mci_readl(host, CTRL) & SDMMC_CTRL_RESET)) + goto ciu_out; + } + + if (IS_ENABLED(CONFIG_MMC_DW_IDMAC)) + /* It is also recommended that we reset and reprogram idmac */ + dw_mci_idmac_reset(host); + + ret = true; + +ciu_out: + /* After a CTRL reset we need to have CIU set clock registers */ + mci_send_cmd(host->cur_slot, SDMMC_CMD_UPD_CLK, 0); + + return ret; } #ifdef CONFIG_OF @@ -2432,6 +2471,7 @@ int dw_mci_probe(struct dw_mci *host) const struct dw_mci_drv_data *drv_data = host->drv_data; int width, i, ret = 0; u32 fifo_size; + u32 flags; int init_slots = 0; if (!host->pdata) { @@ -2555,7 +2595,8 @@ int dw_mci_probe(struct dw_mci *host) } /* Reset all blocks */ - if (!dw_mci_ctrl_all_reset(host)) + flags = SDMMC_CTRL_RESET | SDMMC_CTRL_FIFO_RESET | SDMMC_CTRL_DMA_RESET; + if (!dw_mci_ctrl_reset(host, flags)) return -ENODEV; host->dma_ops = host->pdata->dma_ops; @@ -2744,7 +2785,7 @@ int dw_mci_resume(struct dw_mci *host) } } - if (!dw_mci_ctrl_all_reset(host)) { + if (!dw_mci_reset(host)) { ret = -ENODEV; return ret; } diff --git a/drivers/mmc/host/dw_mmc.h b/drivers/mmc/host/dw_mmc.h index 6bf24ab..2505804 100644 --- a/drivers/mmc/host/dw_mmc.h +++ b/drivers/mmc/host/dw_mmc.h @@ -129,6 +129,7 @@ #define SDMMC_CMD_INDX(n) ((n) & 0x1F) /* Status register defines */ #define SDMMC_GET_FCNT(x) (((x)>>17) & 0x1FFF) +#define SDMMC_STATUS_DMA_REQ BIT(31) /* FIFOTH register defines */ #define SDMMC_SET_FIFOTH(m, r, t) (((m) & 0x7) << 28 | \ ((r) & 0xFFF) << 16 | \