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mmc: tmio: add callbacks to enable-update and disable the interface clock 

Every time the clock is enabled after possibly being disabled, we have
to re-read its frequency and update our configuration.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Guennadi Liakhovetski 2012-06-20 19:10:31 +02:00 committed by Chris Ball
parent e0337cc8b0
commit 8c102a9646
2 changed files with 35 additions and 3 deletions
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35
drivers/mmc/host/tmio_mmc_pio.c
View File

@ -752,6 +752,22 @@ fail:
mmc_request_done(mmc, mrq);
}
static int tmio_mmc_clk_update(struct mmc_host *mmc)
{
struct tmio_mmc_host *host = mmc_priv(mmc);
struct tmio_mmc_data *pdata = host->pdata;
int ret;
if (!pdata->clk_enable)
return -ENOTSUPP;
ret = pdata->clk_enable(host->pdev, &mmc->f_max);
if (!ret)
mmc->f_min = mmc->f_max / 512;
return ret;
}
/* Set MMC clock / power.
* Note: This controller uses a simple divider scheme therefore it cannot
* run a MMC card at full speed (20MHz). The max clock is 24MHz on SD, but as
@ -798,6 +814,7 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
*/
if (ios->power_mode == MMC_POWER_ON && ios->clock) {
if (!host->power) {
tmio_mmc_clk_update(mmc);
pm_runtime_get_sync(dev);
host->power = true;
}
@ -811,9 +828,12 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
if (host->set_pwr && ios->power_mode == MMC_POWER_OFF)
host->set_pwr(host->pdev, 0);
if (host->power) {
struct tmio_mmc_data *pdata = host->pdata;
tmio_mmc_clk_stop(host);
host->power = false;
pm_runtime_put(dev);
if (pdata->clk_disable)
pdata->clk_disable(host->pdev);
}
}
@ -907,8 +927,6 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
mmc->ops = &tmio_mmc_ops;
mmc->caps = MMC_CAP_4_BIT_DATA | pdata->capabilities;
mmc->f_max = pdata->hclk;
mmc->f_min = mmc->f_max / 512;
mmc->max_segs = 32;
mmc->max_blk_size = 512;
mmc->max_blk_count = (PAGE_CACHE_SIZE / mmc->max_blk_size) *
@ -930,6 +948,11 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
if (ret < 0)
goto pm_disable;
if (tmio_mmc_clk_update(mmc) < 0) {
mmc->f_max = pdata->hclk;
mmc->f_min = mmc->f_max / 512;
}
/*
* There are 4 different scenarios for the card detection:
* 1) an external gpio irq handles the cd (best for power savings)
@ -975,7 +998,13 @@ int __devinit tmio_mmc_host_probe(struct tmio_mmc_host **host,
/* See if we also get DMA */
tmio_mmc_request_dma(_host, pdata);
mmc_add_host(mmc);
ret = mmc_add_host(mmc);
if (pdata->clk_disable)
pdata->clk_disable(pdev);
if (ret < 0) {
tmio_mmc_host_remove(_host);
return ret;
}
dev_pm_qos_expose_latency_limit(&pdev->dev, 100);

3
include/linux/mfd/tmio.h
View File

@ -110,6 +110,9 @@ struct tmio_mmc_data {
void (*set_clk_div)(struct platform_device *host, int state);
int (*get_cd)(struct platform_device *host);
int (*write16_hook)(struct tmio_mmc_host *host, int addr);
/* clock management callbacks */
int (*clk_enable)(struct platform_device *pdev, unsigned int *f);
void (*clk_disable)(struct platform_device *pdev);
};
/*