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mmc: sdhci-brcmstb: Add ability to increase max clock rate for 72116b0 

The 72116B0 has improved SDIO controllers that allow the max clock
rate to be increased from a max of 100MHz to a max of 150MHz. The
driver will need to get the clock and increase it's default rate
and override the caps register, that still indicates a max of 100MHz.
The new clock will be named "sdio_freq" in the DT node's "clock-names"
list. The driver will use a DT property, "clock-frequency", to
enable this functionality and will get the actual rate in MHz
from the property to allow various speeds to be requested.

Signed-off-by: Al Cooper <alcooperx@gmail.com>
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
Acked-by: Florian Fainelli <f.fainelli@gmail.com>
Link: https://lore.kernel.org/r/20220520183108.47358-3-kdasu.kdev@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Kamal Dasu 2022-05-20 14:31:08 -04:00 committed by Ulf Hansson
parent 2f8690ef64
commit 97904a5985
1 changed files with 68 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
drivers/mmc/host/sdhci-brcmstb.c
View File

@ -31,6 +31,8 @@
struct sdhci_brcmstb_priv {
void __iomem *cfg_regs;
unsigned int flags;
struct clk *base_clk;
u32 base_freq_hz;
};
struct brcmstb_match_priv {
@ -250,9 +252,11 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
struct sdhci_pltfm_host *pltfm_host;
const struct of_device_id *match;
struct sdhci_brcmstb_priv *priv;
u32 actual_clock_mhz;
struct sdhci_host *host;
struct resource *iomem;
struct clk *clk;
struct clk *base_clk;
int res;
match = of_match_node(sdhci_brcm_of_match, pdev->dev.of_node);
@ -330,6 +334,35 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
if (match_priv->flags & BRCMSTB_MATCH_FLAGS_BROKEN_TIMEOUT)
host->quirks |= SDHCI_QUIRK_BROKEN_TIMEOUT_VAL;
/* Change the base clock frequency if the DT property exists */
if (device_property_read_u32(&pdev->dev, "clock-frequency",
&priv->base_freq_hz) != 0)
goto add_host;
base_clk = devm_clk_get_optional(&pdev->dev, "sdio_freq");
if (IS_ERR(base_clk)) {
dev_warn(&pdev->dev, "Clock for \"sdio_freq\" not found\n");
goto add_host;
}
res = clk_prepare_enable(base_clk);
if (res)
goto err;
/* set improved clock rate */
clk_set_rate(base_clk, priv->base_freq_hz);
actual_clock_mhz = clk_get_rate(base_clk) / 1000000;
host->caps &= ~SDHCI_CLOCK_V3_BASE_MASK;
host->caps |= (actual_clock_mhz << SDHCI_CLOCK_BASE_SHIFT);
/* Disable presets because they are now incorrect */
host->quirks2 |= SDHCI_QUIRK2_PRESET_VALUE_BROKEN;
dev_dbg(&pdev->dev, "Base Clock Frequency changed to %dMHz\n",
actual_clock_mhz);
priv->base_clk = base_clk;
add_host:
res = sdhci_brcmstb_add_host(host, priv);
if (res)
goto err;
@ -340,6 +373,7 @@ static int sdhci_brcmstb_probe(struct platform_device *pdev)
err:
sdhci_pltfm_free(pdev);
err_clk:
clk_disable_unprepare(base_clk);
clk_disable_unprepare(clk);
return res;
}
@ -351,11 +385,44 @@ static void sdhci_brcmstb_shutdown(struct platform_device *pdev)
MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
#ifdef CONFIG_PM_SLEEP
static int sdhci_brcmstb_suspend(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host);
clk_disable_unprepare(priv->base_clk);
return sdhci_pltfm_suspend(dev);
}
static int sdhci_brcmstb_resume(struct device *dev)
{
struct sdhci_host *host = dev_get_drvdata(dev);
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_brcmstb_priv *priv = sdhci_pltfm_priv(pltfm_host);
int ret;
ret = sdhci_pltfm_resume(dev);
if (!ret && priv->base_freq_hz) {
ret = clk_prepare_enable(priv->base_clk);
if (!ret)
ret = clk_set_rate(priv->base_clk, priv->base_freq_hz);
}
return ret;
}
#endif
static const struct dev_pm_ops sdhci_brcmstb_pmops = {
SET_SYSTEM_SLEEP_PM_OPS(sdhci_brcmstb_suspend, sdhci_brcmstb_resume)
};
static struct platform_driver sdhci_brcmstb_driver = {
.driver = {
.name = "sdhci-brcmstb",
.probe_type = PROBE_PREFER_ASYNCHRONOUS,
.pm = &sdhci_pltfm_pmops,
.pm = &sdhci_brcmstb_pmops,
.of_match_table = of_match_ptr(sdhci_brcm_of_match),
},
.probe = sdhci_brcmstb_probe,