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author | Kishon Vijay Abraham I <kishon@ti.com> | 2018-04-27 17:17:12 +0530 |
---|---|---|
committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-05-03 09:35:21 +0200 |
commit | 212f4f8a44909a5f2db187b2ff7cfba46c626528 (patch) | |
tree | 85ebedb07060c762edffeef151d87b1150b8a6ac | |
parent | 5bc2bda54d49cb2dbf9387b47feb25c32d20e216 (diff) | |
download | linux-stable-212f4f8a44909a5f2db187b2ff7cfba46c626528.tar.gz linux-stable-212f4f8a44909a5f2db187b2ff7cfba46c626528.tar.bz2 linux-stable-212f4f8a44909a5f2db187b2ff7cfba46c626528.zip |
mmc: sdhci-omap: Workaround for Errata i843
Errata i843 in AM572x Sitara Processors Silicon Revision 2.0, 1.1
(SPRZ429K July 2014–Revised March 2017 [1]) mentions
PG 1.0/1.1 silicon has limitations w.r.t frequencies at which MMC1/2/3
can operate.
Use soc_device_match() to identify rev 1.0/1.1 silicon and
override mmc->f_max according to the errata workaround.
"max-frequency" dt property cannot be used since the device
tree is added for rev 2.0 silicon.
soc_device_match() is also used in order to get the IODelay values
for rev 1.0/1.1 silicon.
[1] -> http://www.ti.com/lit/er/sprz429k/sprz429k.pdf
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
-rw-r--r-- | drivers/mmc/host/sdhci-omap.c | 35 |
1 files changed, 34 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c index 78f3ceea570e..b3dc7f1466e5 100644 --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -26,6 +26,7 @@ #include <linux/pm_runtime.h> #include <linux/regulator/consumer.h> #include <linux/pinctrl/consumer.h> +#include <linux/sys_soc.h> #include "sdhci-pltfm.h" @@ -100,6 +101,7 @@ struct sdhci_omap_data { }; struct sdhci_omap_host { + char *version; void __iomem *base; struct device *dev; struct regulator *pbias; @@ -733,12 +735,21 @@ static struct pinctrl_state u32 *caps, u32 capmask) { struct device *dev = omap_host->dev; + char *version = omap_host->version; struct pinctrl_state *pinctrl_state = ERR_PTR(-ENODEV); + char str[20]; if (!(*caps & capmask)) goto ret; - pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, mode); + if (version) { + snprintf(str, 20, "%s-%s", mode, version); + pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, str); + } + + if (IS_ERR(pinctrl_state)) + pinctrl_state = pinctrl_lookup_state(omap_host->pinctrl, mode); + if (IS_ERR(pinctrl_state)) { dev_err(dev, "no pinctrl state for %s mode", mode); *caps &= ~capmask; @@ -830,6 +841,16 @@ static int sdhci_omap_config_iodelay_pinctrl_state(struct sdhci_omap_host return 0; } +static const struct soc_device_attribute sdhci_omap_soc_devices[] = { + { + .machine = "DRA7[45]*", + .revision = "ES1.[01]", + }, + { + /* sentinel */ + } +}; + static int sdhci_omap_probe(struct platform_device *pdev) { int ret; @@ -841,6 +862,7 @@ static int sdhci_omap_probe(struct platform_device *pdev) struct mmc_host *mmc; const struct of_device_id *match; struct sdhci_omap_data *data; + const struct soc_device_attribute *soc; match = of_match_device(omap_sdhci_match, dev); if (!match) @@ -875,6 +897,17 @@ static int sdhci_omap_probe(struct platform_device *pdev) if (ret) goto err_pltfm_free; + soc = soc_device_match(sdhci_omap_soc_devices); + if (soc) { + omap_host->version = "rev11"; + if (!strcmp(dev_name(dev), "4809c000.mmc")) + mmc->f_max = 96000000; + if (!strcmp(dev_name(dev), "480b4000.mmc")) + mmc->f_max = 48000000; + if (!strcmp(dev_name(dev), "480ad000.mmc")) + mmc->f_max = 48000000; + } + pltfm_host->clk = devm_clk_get(dev, "fck"); if (IS_ERR(pltfm_host->clk)) { ret = PTR_ERR(pltfm_host->clk); |