Re: [PATCHv5] mmc: dw_mmc: change to use recommended reset procedure
On 07/12/2014 05:53 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 sonny...@chromium.org Signed-off-by: Yuvaraj Kumar C D yuvaraj...@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 v4: remove comment about FIFO reset in dw_mci_work_routine_card() move down error message when control reset clears but others don't and clarify the error stating that we will still update clocks make flags for all reset bits a macro v5: don't use dw_mci_reset() in dw_mci_resume() and instead match what is done in dw_mci_probe() and don't force inline dw_mci_resume() --- drivers/mmc/host/dw_mmc.c | 86 ++- drivers/mmc/host/dw_mmc.h | 5 +++ 2 files changed, 68 insertions(+), 23 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 55cd110..db25494 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 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 +1981,8 @@ static void dw_mci_work_routine_card(struct work_struct *work) } /* Power down slot */ - if (present == 0) { - /* Clear down the FIFO */ - dw_mci_fifo_reset(host); -#ifdef CONFIG_MMC_DW_IDMAC - dw_mci_idmac_reset(host); -#endif - - } + if (present == 0) + dw_mci_reset(host); spin_unlock_bh(host-lock); @@ -2323,8 +2316,11 @@ 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 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 +2330,59 @@ 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, 0x); + + /* 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)) +
[PATCHv5] mmc: dw_mmc: change to use recommended reset procedure
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 sonny...@chromium.org Signed-off-by: Yuvaraj Kumar C D yuvaraj...@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 v4: remove comment about FIFO reset in dw_mci_work_routine_card() move down error message when control reset clears but others don't and clarify the error stating that we will still update clocks make flags for all reset bits a macro v5: don't use dw_mci_reset() in dw_mci_resume() and instead match what is done in dw_mci_probe() and don't force inline dw_mci_resume() --- drivers/mmc/host/dw_mmc.c | 86 ++- drivers/mmc/host/dw_mmc.h | 5 +++ 2 files changed, 68 insertions(+), 23 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 55cd110..db25494 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 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 +1981,8 @@ static void dw_mci_work_routine_card(struct work_struct *work) } /* Power down slot */ - if (present == 0) { - /* Clear down the FIFO */ - dw_mci_fifo_reset(host); -#ifdef CONFIG_MMC_DW_IDMAC - dw_mci_idmac_reset(host); -#endif - - } + if (present == 0) + dw_mci_reset(host); spin_unlock_bh(host-lock); @@ -2323,8 +2316,11 @@ 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 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 +2330,59 @@ 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, 0x); + + /* 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(); +