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authorYangbo Lu <yangbo.lu@nxp.com>2018-11-23 06:15:35 +0300
committerUlf Hansson <ulf.hansson@linaro.org>2018-12-17 10:26:24 +0300
commit6079e63cdeac804bbf3ee7301d447812e5b81d84 (patch)
tree3b37ab161c73917aa82764089ae574353af90211 /drivers/mmc
parent54e08d9a95ca54a192a9aef76742a4f7e81f6780 (diff)
downloadlinux-6079e63cdeac804bbf3ee7301d447812e5b81d84.tar.xz
mmc: sdhci-of-esdhc: add erratum A011334 support
There are timing violations in case of few division ratio options are selected for card clock frequency. prescaler*divisor options /3,/5,/6,/7,/9,/10,/11,/13,/14 and /15 are not available in LX2 Rev1.0. prescaler*divisor options /4,/8 and /12 only available in LX2 Rev1.0. Applicable only for HS400 mode. so by add the erratum A011334 support to limit the prescaler*divisor in LX2 REV1.0 Signed-off-by: Yangbo Lu <yangbo.lu@nxp.com> Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/sdhci-of-esdhc.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index fb4fe96821ce..b73d75251f8a 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -78,6 +78,7 @@ struct sdhci_esdhc {
u8 vendor_ver;
u8 spec_ver;
bool quirk_incorrect_hostver;
+ bool quirk_limited_clk_division;
bool quirk_fixup_tuning;
unsigned int peripheral_clock;
const struct esdhc_clk_fixup *clk_fixup;
@@ -544,6 +545,7 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
int pre_div = 1;
int div = 1;
+ int division;
ktime_t timeout;
long fixup = 0;
u32 temp;
@@ -579,6 +581,26 @@ static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
while (host->max_clk / pre_div / div > clock && div < 16)
div++;
+ if (esdhc->quirk_limited_clk_division &&
+ clock == MMC_HS200_MAX_DTR &&
+ (host->mmc->ios.timing == MMC_TIMING_MMC_HS400 ||
+ host->flags & SDHCI_HS400_TUNING)) {
+ division = pre_div * div;
+ if (division <= 4) {
+ pre_div = 4;
+ div = 1;
+ } else if (division <= 8) {
+ pre_div = 4;
+ div = 2;
+ } else if (division <= 12) {
+ pre_div = 4;
+ div = 3;
+ } else {
+ pr_warn("%s: using upsupported clock division.\n",
+ mmc_hostname(host->mmc));
+ }
+ }
+
dev_dbg(mmc_dev(host->mmc), "desired SD clock: %d, actual: %d\n",
clock, host->max_clk / pre_div / div);
host->mmc->actual_clock = host->max_clk / pre_div / div;
@@ -778,6 +800,10 @@ static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
u32 val;
int ret;
+ if (esdhc->quirk_limited_clk_division &&
+ host->flags & SDHCI_HS400_TUNING)
+ esdhc_of_set_clock(host, host->clock);
+
esdhc_tuning_block_enable(host, true);
hs400_tuning = host->flags & SDHCI_HS400_TUNING;
@@ -908,6 +934,11 @@ static struct soc_device_attribute soc_incorrect_hostver[] = {
{ },
};
+static struct soc_device_attribute soc_fixup_sdhc_clkdivs[] = {
+ { .family = "QorIQ LX2160A", .revision = "1.0", },
+ { },
+};
+
static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
{
const struct of_device_id *match;
@@ -930,6 +961,11 @@ static void esdhc_init(struct platform_device *pdev, struct sdhci_host *host)
else
esdhc->quirk_incorrect_hostver = false;
+ if (soc_device_match(soc_fixup_sdhc_clkdivs))
+ esdhc->quirk_limited_clk_division = true;
+ else
+ esdhc->quirk_limited_clk_division = false;
+
match = of_match_node(sdhci_esdhc_of_match, pdev->dev.of_node);
if (match)
esdhc->clk_fixup = match->data;