From 4e9f8fe5f25f0ee1361618e5f494cf5d14ee4936 Mon Sep 17 00:00:00 2001 From: Adrian Hunter Date: Wed, 29 Jun 2016 16:24:34 +0300 Subject: [PATCH] mmc: sdhci: Allow for finishing multiple requests In order to support commands during data transfer, there will have to be up to two active requests (mrqs) at a time, instead of just one. That means recording which request is finished. Doing that obsoletes host->mrq which is therefore removed. Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson --- drivers/mmc/host/sdhci.c | 71 +++++++++++++++++++++++++++++++++--------------- drivers/mmc/host/sdhci.h | 5 +++- 2 files changed, 53 insertions(+), 23 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 9580f76..e37d0e9 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -938,6 +938,29 @@ static bool sdhci_needs_reset(struct sdhci_host *host, struct mmc_request *mrq) (host->quirks & SDHCI_QUIRK_RESET_AFTER_REQUEST))); } +static void __sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) +{ + int i; + + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + if (host->mrqs_done[i] == mrq) { + WARN_ON(1); + return; + } + } + + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + if (!host->mrqs_done[i]) { + host->mrqs_done[i] = mrq; + break; + } + } + + WARN_ON(i >= SDHCI_MAX_MRQS); + + tasklet_schedule(&host->finish_tasklet); +} + static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) { if (host->cmd && host->cmd->mrq == mrq) @@ -952,7 +975,7 @@ static void sdhci_finish_mrq(struct sdhci_host *host, struct mmc_request *mrq) if (sdhci_needs_reset(host, mrq)) host->pending_reset = true; - tasklet_schedule(&host->finish_tasklet); + __sdhci_finish_mrq(host, mrq); } static void sdhci_finish_data(struct sdhci_host *host) @@ -1440,8 +1463,6 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) spin_lock_irqsave(&host->lock, flags); - WARN_ON(host->mrq != NULL); - sdhci_led_activate(host); /* @@ -1455,8 +1476,6 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) } } - host->mrq = mrq; - if (!present || host->flags & SDHCI_DEVICE_DEAD) { mrq->cmd->error = -ENOMEDIUM; sdhci_finish_mrq(host, mrq); @@ -1993,13 +2012,13 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC; cmd.retries = 0; cmd.data = NULL; + cmd.mrq = &mrq; cmd.error = 0; if (tuning_loop_counter-- == 0) break; mrq.cmd = &cmd; - host->mrq = &mrq; /* * In response to CMD19, the card sends 64 bytes of tuning @@ -2029,7 +2048,6 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode) sdhci_send_command(host, &cmd); host->cmd = NULL; - host->mrq = NULL; spin_unlock_irqrestore(&host->lock, flags); /* Wait for Buffer Read Ready interrupt */ @@ -2230,26 +2248,26 @@ static const struct mmc_host_ops sdhci_ops = { * * \*****************************************************************************/ -static void sdhci_tasklet_finish(unsigned long param) +static bool sdhci_request_done(struct sdhci_host *host) { - struct sdhci_host *host; unsigned long flags; struct mmc_request *mrq; - - host = (struct sdhci_host*)param; + int i; spin_lock_irqsave(&host->lock, flags); - /* - * If this tasklet gets rescheduled while running, it will - * be run again afterwards but without any active request. - */ - if (!host->mrq) { - spin_unlock_irqrestore(&host->lock, flags); - return; + for (i = 0; i < SDHCI_MAX_MRQS; i++) { + mrq = host->mrqs_done[i]; + if (mrq) { + host->mrqs_done[i] = NULL; + break; + } } - mrq = host->mrq; + if (!mrq) { + spin_unlock_irqrestore(&host->lock, flags); + return true; + } sdhci_del_timer(host, mrq); @@ -2287,14 +2305,23 @@ static void sdhci_tasklet_finish(unsigned long param) host->pending_reset = false; } - host->mrq = NULL; - - sdhci_led_deactivate(host); + if (!sdhci_has_requests(host)) + sdhci_led_deactivate(host); mmiowb(); spin_unlock_irqrestore(&host->lock, flags); mmc_request_done(host->mmc, mrq); + + return false; +} + +static void sdhci_tasklet_finish(unsigned long param) +{ + struct sdhci_host *host = (struct sdhci_host *)param; + + while (!sdhci_request_done(host)) + ; } static void sdhci_timeout_timer(unsigned long data) diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index a1de422..1f0413b 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -314,6 +314,9 @@ struct sdhci_adma2_64_desc { */ #define SDHCI_MAX_SEGS 128 +/* Allow for a a command request and a data request at the same time */ +#define SDHCI_MAX_MRQS 2 + enum sdhci_cookie { COOKIE_UNMAPPED, COOKIE_PRE_MAPPED, /* mapped by sdhci_pre_req() */ @@ -465,7 +468,7 @@ struct sdhci_host { bool preset_enabled; /* Preset is enabled */ bool pending_reset; /* Cmd/data reset is pending */ - struct mmc_request *mrq; /* Current request */ + struct mmc_request *mrqs_done[SDHCI_MAX_MRQS]; /* Requests done */ struct mmc_command *cmd; /* Current command */ struct mmc_command *data_cmd; /* Current data command */ struct mmc_data *data; /* Current data request */ -- 2.7.4