mmc: sdhci-esdhc-imx: Convert to mmc_send_tuning()

Instead of having a local function taking care of sending the tuning
command, let's use the common mmc_send_tuning() API provided by the mmc
core. In this way the request will be handled as any other request by
sdhci core.

As an effect of this change, the pm_runtime_get_sync() call at
esdhc_prepare_tuning() isn't needed any more.

This patch will also introduce another change in behavior, since before
the response pattern to the tuning command wasn't verified by
sdhci-esdhc-imx. The mmc_send_tuning() does that.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Dong Aisheng <b29396@freescale.com>

diff --git a/drivers/mmc/host/sdhci-esdhc-imx.c b/drivers/mmc/host/sdhci-esdhc-imx.c
index 0135f00..12711ab 100644 (file)
--- a/drivers/mmc/host/sdhci-esdhc-imx.c
+++ b/drivers/mmc/host/sdhci-esdhc-imx.c
@@ -65,8 +65,6 @@
 /* NOTE: the minimum valid tuning start tap for mx6sl is 1 */
 #define ESDHC_TUNING_START_TAP         0x1
 
-#define ESDHC_TUNING_BLOCK_PATTERN_LEN 64
-
 /* pinctrl state */
 #define ESDHC_PINCTRL_STATE_100MHZ     "state_100mhz"
 #define ESDHC_PINCTRL_STATE_200MHZ     "state_200mhz"
@@ -692,8 +690,6 @@ static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
        /* FIXME: delay a bit for card to be ready for next tuning due to errors */
        mdelay(1);
 
-       /* This is balanced by the runtime put in sdhci_tasklet_finish */
-       pm_runtime_get_sync(host->mmc->parent);
        reg = readl(host->ioaddr + ESDHC_MIX_CTRL);
        reg |= ESDHC_MIX_CTRL_EXE_TUNE | ESDHC_MIX_CTRL_SMPCLK_SEL |
                        ESDHC_MIX_CTRL_FBCLK_SEL;
@@ -704,54 +700,6 @@ static void esdhc_prepare_tuning(struct sdhci_host *host, u32 val)
                        val, readl(host->ioaddr + ESDHC_TUNE_CTRL_STATUS));
 }
 
-static void esdhc_request_done(struct mmc_request *mrq)
-{
-       complete(&mrq->completion);
-}
-
-static int esdhc_send_tuning_cmd(struct sdhci_host *host, u32 opcode,
-                                struct scatterlist *sg)
-{
-       struct mmc_command cmd = {0};
-       struct mmc_request mrq = {NULL};
-       struct mmc_data data = {0};
-
-       cmd.opcode = opcode;
-       cmd.arg = 0;
-       cmd.flags = MMC_RSP_R1 | MMC_CMD_ADTC;
-
-       data.blksz = ESDHC_TUNING_BLOCK_PATTERN_LEN;
-       data.blocks = 1;
-       data.flags = MMC_DATA_READ;
-       data.sg = sg;
-       data.sg_len = 1;
-
-       mrq.cmd = &cmd;
-       mrq.cmd->mrq = &mrq;
-       mrq.data = &data;
-       mrq.data->mrq = &mrq;
-       mrq.cmd->data = mrq.data;
-
-       mrq.done = esdhc_request_done;
-       init_completion(&(mrq.completion));
-
-       spin_lock_irq(&host->lock);
-       host->mrq = &mrq;
-
-       sdhci_send_command(host, mrq.cmd);
-
-       spin_unlock_irq(&host->lock);
-
-       wait_for_completion(&mrq.completion);
-
-       if (cmd.error)
-               return cmd.error;
-       if (data.error)
-               return data.error;
-
-       return 0;
-}
-
 static void esdhc_post_tuning(struct sdhci_host *host)
 {
        u32 reg;
@@ -763,21 +711,13 @@ static void esdhc_post_tuning(struct sdhci_host *host)
 
 static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
 {
-       struct scatterlist sg;
-       char *tuning_pattern;
        int min, max, avg, ret;
 
-       tuning_pattern = kmalloc(ESDHC_TUNING_BLOCK_PATTERN_LEN, GFP_KERNEL);
-       if (!tuning_pattern)
-               return -ENOMEM;
-
-       sg_init_one(&sg, tuning_pattern, ESDHC_TUNING_BLOCK_PATTERN_LEN);
-
        /* find the mininum delay first which can pass tuning */
        min = ESDHC_TUNE_CTRL_MIN;
        while (min < ESDHC_TUNE_CTRL_MAX) {
                esdhc_prepare_tuning(host, min);
-               if (!esdhc_send_tuning_cmd(host, opcode, &sg))
+               if (!mmc_send_tuning(host->mmc))
                        break;
                min += ESDHC_TUNE_CTRL_STEP;
        }
@@ -786,7 +726,7 @@ static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
        max = min + ESDHC_TUNE_CTRL_STEP;
        while (max < ESDHC_TUNE_CTRL_MAX) {
                esdhc_prepare_tuning(host, max);
-               if (esdhc_send_tuning_cmd(host, opcode, &sg)) {
+               if (mmc_send_tuning(host->mmc)) {
                        max -= ESDHC_TUNE_CTRL_STEP;
                        break;
                }
@@ -796,11 +736,9 @@ static int esdhc_executing_tuning(struct sdhci_host *host, u32 opcode)
        /* use average delay to get the best timing */
        avg = (min + max) / 2;
        esdhc_prepare_tuning(host, avg);
-       ret = esdhc_send_tuning_cmd(host, opcode, &sg);
+       ret = mmc_send_tuning(host->mmc);
        esdhc_post_tuning(host);
 
-       kfree(tuning_pattern);
-
        dev_dbg(mmc_dev(host->mmc), "tunning %s at 0x%x ret %d\n",
                ret ? "failed" : "passed", avg, ret);