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mmc: core: Add support for re-tuning before each request
At the start of each request, re-tune if needed and then hold off re-tuning again until the request is done. Note that though there is one function that starts requests (mmc_start_request) there are two that wait for the request to be done (mmc_wait_for_req_done and mmc_wait_for_data_req_done). Also note that mmc_wait_for_data_req_done can return even when the request is not done (which allows the block driver to prepare a newly arrived request while still waiting for the previous request). This patch ensures re-tuning is held for the duration of a request. Subsequent patches will also hold re-tuning at other times when it might cause a conflict. In addition, possibly a command is failing because re-tuning is needed. Use mmc_retune_recheck() to check re-tuning. At that point re-tuning is held, at least by the request, so mmc_retune_recheck() flags host->retune_now if the hold count is 1. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
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@ -186,12 +186,29 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
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EXPORT_SYMBOL(mmc_request_done);
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static void __mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
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{
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int err;
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/* Assumes host controller has been runtime resumed by mmc_claim_host */
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err = mmc_retune(host);
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if (err) {
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mrq->cmd->error = err;
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mmc_request_done(host, mrq);
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return;
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}
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host->ops->request(host, mrq);
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}
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static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
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{
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#ifdef CONFIG_MMC_DEBUG
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unsigned int i, sz;
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struct scatterlist *sg;
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#endif
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mmc_retune_hold(host);
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if (mmc_card_removed(host->card))
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return -ENOMEDIUM;
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@ -252,7 +269,7 @@ static int mmc_start_request(struct mmc_host *host, struct mmc_request *mrq)
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}
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mmc_host_clk_hold(host);
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led_trigger_event(host->led, LED_FULL);
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host->ops->request(host, mrq);
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__mmc_start_request(host, mrq);
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return 0;
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}
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@ -417,22 +434,22 @@ static int mmc_wait_for_data_req_done(struct mmc_host *host,
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host->areq);
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break; /* return err */
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} else {
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mmc_retune_recheck(host);
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pr_info("%s: req failed (CMD%u): %d, retrying...\n",
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mmc_hostname(host),
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cmd->opcode, cmd->error);
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cmd->retries--;
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cmd->error = 0;
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host->ops->request(host, mrq);
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__mmc_start_request(host, mrq);
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continue; /* wait for done/new event again */
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}
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} else if (context_info->is_new_req) {
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context_info->is_new_req = false;
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if (!next_req) {
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err = MMC_BLK_NEW_REQUEST;
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break; /* return err */
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}
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if (!next_req)
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return MMC_BLK_NEW_REQUEST;
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}
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}
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mmc_retune_release(host);
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return err;
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}
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@ -467,12 +484,16 @@ static void mmc_wait_for_req_done(struct mmc_host *host,
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mmc_card_removed(host->card))
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break;
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mmc_retune_recheck(host);
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pr_debug("%s: req failed (CMD%u): %d, retrying...\n",
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mmc_hostname(host), cmd->opcode, cmd->error);
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cmd->retries--;
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cmd->error = 0;
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host->ops->request(host, mrq);
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__mmc_start_request(host, mrq);
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}
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mmc_retune_release(host);
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}
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/**
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