diff mbox series

[v5] mmc: sdhci-of-esdhc: add erratum A008171 support

Message ID 20180823043215.31256-1-yinbo.zhu@nxp.com (mailing list archive)
State New, archived
Headers show
Series [v5] mmc: sdhci-of-esdhc: add erratum A008171 support | expand

Commit Message

Yinbo Zhu Aug. 23, 2018, 4:32 a.m. UTC
In tuning mode of operation, when TBCTL[TB_EN] is set, eSDHC may report
one of the following errors :
1)Tuning error while running tuning operation where SYSCTL2[SAMPCLKSEL]
will not get set even when SYSCTL2[EXTN] is reset. OR
2)Data transaction error (e.g. IRQSTAT[DCE], IRQSTAT[DEBE]) during data
transaction errors.
This issue occurs when the data window sampled within eSDHC is in full
cycle. So, in that case, eSDHC is not able to find out the start and
end points of the data window and sets the sampling pointer at default
location (which is middle of the internal SD clock). If this sampling
point coincides with the data eye boundary, then it can result in the
above mentioned errors. Impact: Tuning mode of operation for SDR50,
SDR104 or HS200 speed modes may not work properly
Workaround: In case eSDHC reports tuning error or data errors in tuning
mode of operation, by add the erratum A008171 support to fix the issue.

Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
---
Change in v5:
		Modify some return value for tuning procedure.	

 drivers/mmc/host/sdhci-esdhc.h    |    1 +
 drivers/mmc/host/sdhci-of-esdhc.c |   44 ++++++++++++++++++++++++++++++++++++-
 drivers/mmc/host/sdhci.c          |    9 ++++---
 drivers/mmc/host/sdhci.h          |    1 +
 4 files changed, 50 insertions(+), 5 deletions(-)

Comments

Adrian Hunter Aug. 23, 2018, 6:14 a.m. UTC | #1
On 23/08/18 07:32, Yinbo Zhu wrote:
> In tuning mode of operation, when TBCTL[TB_EN] is set, eSDHC may report
> one of the following errors :
> 1)Tuning error while running tuning operation where SYSCTL2[SAMPCLKSEL]
> will not get set even when SYSCTL2[EXTN] is reset. OR
> 2)Data transaction error (e.g. IRQSTAT[DCE], IRQSTAT[DEBE]) during data
> transaction errors.
> This issue occurs when the data window sampled within eSDHC is in full
> cycle. So, in that case, eSDHC is not able to find out the start and
> end points of the data window and sets the sampling pointer at default
> location (which is middle of the internal SD clock). If this sampling
> point coincides with the data eye boundary, then it can result in the
> above mentioned errors. Impact: Tuning mode of operation for SDR50,
> SDR104 or HS200 speed modes may not work properly
> Workaround: In case eSDHC reports tuning error or data errors in tuning
> mode of operation, by add the erratum A008171 support to fix the issue.
> 
> Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
> ---
> Change in v5:
> 		Modify some return value for tuning procedure.	
> 
>  drivers/mmc/host/sdhci-esdhc.h    |    1 +
>  drivers/mmc/host/sdhci-of-esdhc.c |   44 ++++++++++++++++++++++++++++++++++++-
>  drivers/mmc/host/sdhci.c          |    9 ++++---
>  drivers/mmc/host/sdhci.h          |    1 +

Please make the sdhci.[ch] changes a separate patch
Ulf Hansson Aug. 23, 2018, 10:43 a.m. UTC | #2
On 23 August 2018 at 08:14, Adrian Hunter <adrian.hunter@intel.com> wrote:
> On 23/08/18 07:32, Yinbo Zhu wrote:
>> In tuning mode of operation, when TBCTL[TB_EN] is set, eSDHC may report
>> one of the following errors :
>> 1)Tuning error while running tuning operation where SYSCTL2[SAMPCLKSEL]
>> will not get set even when SYSCTL2[EXTN] is reset. OR
>> 2)Data transaction error (e.g. IRQSTAT[DCE], IRQSTAT[DEBE]) during data
>> transaction errors.
>> This issue occurs when the data window sampled within eSDHC is in full
>> cycle. So, in that case, eSDHC is not able to find out the start and
>> end points of the data window and sets the sampling pointer at default
>> location (which is middle of the internal SD clock). If this sampling
>> point coincides with the data eye boundary, then it can result in the
>> above mentioned errors. Impact: Tuning mode of operation for SDR50,
>> SDR104 or HS200 speed modes may not work properly
>> Workaround: In case eSDHC reports tuning error or data errors in tuning
>> mode of operation, by add the erratum A008171 support to fix the issue.
>>
>> Signed-off-by: Yinbo Zhu <yinbo.zhu@nxp.com>
>> ---
>> Change in v5:
>>               Modify some return value for tuning procedure.
>>
>>  drivers/mmc/host/sdhci-esdhc.h    |    1 +
>>  drivers/mmc/host/sdhci-of-esdhc.c |   44 ++++++++++++++++++++++++++++++++++++-
>>  drivers/mmc/host/sdhci.c          |    9 ++++---
>>  drivers/mmc/host/sdhci.h          |    1 +
>
> Please make the sdhci.[ch] changes a separate patch

That's a good comment. I drop the patch and waiting for v6 instead.

Kind regards
Uffe
diff mbox series

Patch

diff --git a/drivers/mmc/host/sdhci-esdhc.h b/drivers/mmc/host/sdhci-esdhc.h
index dfa58f8..3f16d9c 100644
--- a/drivers/mmc/host/sdhci-esdhc.h
+++ b/drivers/mmc/host/sdhci-esdhc.h
@@ -60,6 +60,7 @@ 
 /* Tuning Block Control Register */
 #define ESDHC_TBCTL			0x120
 #define ESDHC_TB_EN			0x00000004
+#define ESDHC_TBPTR			0x128
 
 /* Control Register for DMA transfer */
 #define ESDHC_DMA_SYSCTL		0x40c
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c
index c9685c6..07ba209 100644
--- a/drivers/mmc/host/sdhci-of-esdhc.c
+++ b/drivers/mmc/host/sdhci-of-esdhc.c
@@ -77,8 +77,10 @@  struct sdhci_esdhc {
 	u8 vendor_ver;
 	u8 spec_ver;
 	bool quirk_incorrect_hostver;
+	bool quirk_fixup_tuning;
 	unsigned int peripheral_clock;
 	const struct esdhc_clk_fixup *clk_fixup;
+	u32 div_ratio;
 };
 
 /**
@@ -574,6 +576,7 @@  static void esdhc_of_set_clock(struct sdhci_host *host, unsigned int clock)
 	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;
+	esdhc->div_ratio = pre_div * div;
 	pre_div >>= 1;
 	div--;
 
@@ -706,9 +709,24 @@  static int esdhc_signal_voltage_switch(struct mmc_host *mmc,
 	}
 }
 
+static struct soc_device_attribute soc_fixup_tuning[] = {
+	{ .family = "QorIQ T1040", .revision = "1.0", },
+	{ .family = "QorIQ T2080", .revision = "1.0", },
+	{ .family = "QorIQ T1023", .revision = "1.0", },
+	{ .family = "QorIQ LS1021A", .revision = "1.0", },
+	{ .family = "QorIQ LS1080A", .revision = "1.0", },
+	{ .family = "QorIQ LS2080A", .revision = "1.0", },
+	{ .family = "QorIQ LS1012A", .revision = "1.0", },
+	{ .family = "QorIQ LS1043A", .revision = "1.*", },
+	{ .family = "QorIQ LS1046A", .revision = "1.0", },
+	{ },
+};
+
 static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 {
 	struct sdhci_host *host = mmc_priv(mmc);
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_esdhc *esdhc = sdhci_pltfm_priv(pltfm_host);
 	u32 val;
 
 	/* Use tuning block for tuning procedure */
@@ -722,7 +740,26 @@  static int esdhc_execute_tuning(struct mmc_host *mmc, u32 opcode)
 	sdhci_writel(host, val, ESDHC_TBCTL);
 	esdhc_clock_enable(host, true);
 
-	return sdhci_execute_tuning(mmc, opcode);
+	sdhci_execute_tuning(mmc, opcode);
+	if (host->tuning_err == -EAGAIN && esdhc->quirk_fixup_tuning) {
+
+		/* program TBPTR[TB_WNDW_END_PTR] = 3*DIV_RATIO and
+		 * program TBPTR[TB_WNDW_START_PTR] = 5*DIV_RATIO
+		 */
+		val = sdhci_readl(host, ESDHC_TBPTR);
+		val = (val & ~((0x7f << 8) | 0x7f)) |
+		(3 * esdhc->div_ratio) | ((5 * esdhc->div_ratio) << 8);
+		sdhci_writel(host, val, ESDHC_TBPTR);
+
+		/* program the software tuning mode by setting
+		 * TBCTL[TB_MODE]=2'h3
+		 */
+		val = sdhci_readl(host, ESDHC_TBCTL);
+		val |= 0x3;
+		sdhci_writel(host, val, ESDHC_TBCTL);
+		sdhci_execute_tuning(mmc, opcode);
+	}
+	return 0;
 }
 
 #ifdef CONFIG_PM_SLEEP
@@ -897,6 +934,11 @@  static int sdhci_esdhc_probe(struct platform_device *pdev)
 
 	pltfm_host = sdhci_priv(host);
 	esdhc = sdhci_pltfm_priv(pltfm_host);
+	if (soc_device_match(soc_fixup_tuning))
+		esdhc->quirk_fixup_tuning = true;
+	else
+		esdhc->quirk_fixup_tuning = false;
+
 	if (esdhc->vendor_ver == VENDOR_V_22)
 		host->quirks2 |= SDHCI_QUIRK2_HOST_NO_CMD23;
 
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 1c828e0..596b375 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2213,7 +2213,7 @@  static void sdhci_send_tuning(struct sdhci_host *host, u32 opcode)
 
 }
 
-static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
+static int __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
 {
 	int i;
 
@@ -2230,13 +2230,13 @@  static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
 			pr_info("%s: Tuning timeout, falling back to fixed sampling clock\n",
 				mmc_hostname(host->mmc));
 			sdhci_abort_tuning(host, opcode);
-			return;
+			return -ETIMEDOUT;
 		}
 
 		ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
 		if (!(ctrl & SDHCI_CTRL_EXEC_TUNING)) {
 			if (ctrl & SDHCI_CTRL_TUNED_CLK)
-				return; /* Success! */
+				return 0; /* Success! */
 			break;
 		}
 
@@ -2248,6 +2248,7 @@  static void __sdhci_execute_tuning(struct sdhci_host *host, u32 opcode)
 	pr_info("%s: Tuning failed, falling back to fixed sampling clock\n",
 		mmc_hostname(host->mmc));
 	sdhci_reset_tuning(host);
+	return -EAGAIN;
 }
 
 int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
@@ -2309,7 +2310,7 @@  int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
 
 	sdhci_start_tuning(host);
 
-	__sdhci_execute_tuning(host, opcode);
+	host->tuning_err = __sdhci_execute_tuning(host, opcode);
 
 	sdhci_end_tuning(host);
 out:
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 23966f8..6c4ed6d 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -554,6 +554,7 @@  struct sdhci_host {
 
 	unsigned int		tuning_count;	/* Timer count for re-tuning */
 	unsigned int		tuning_mode;	/* Re-tuning mode supported by host */
+	unsigned int		tuning_err;	/* Error code for re-tuning */
 #define SDHCI_TUNING_MODE_1	0
 #define SDHCI_TUNING_MODE_2	1
 #define SDHCI_TUNING_MODE_3	2