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Add support for UHS-I on Exynos5422 odroid boards

PATCH Superseded Anand Moon 2 participants 14 messages Sep 20, 2018 – Sep 22, 2018

Subsystems (4)
Device tree bindings Arm Samsung Exynos MMC, SD and SDIO Synopsys DesignWare MMC/SD/SDIO driver

v3 of 5 Superseded Latest is v5 →

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Anand Moon

author
#0 lore raw

v3 cover Add support for UHS-I on Exynos5422 odroid boards

This is series v3 since my previous patches we incomplete with driver changes missing.

These changes add UHS-I tuning for dw_mmc-exynos driver. Some new patches are added to enhance the performace.

Anand Moon (7):
ARM: dts: exynos5422: Added UHS-I bus speed support
ARM: dts: exynos5422: fix regulator min values of LDO13 for Odroid

    XU3/XU4

ARM: dts: exynos5422: update maximum frequency for sdcard to 200MHz
ARM: dts: exynos5422: use cd-gpio method to detect sd-card
ARM: dts: exynos5422: use wp-gpio method to detect sd-card
ARM: dts: exynos5422: update maximum frequency for emmc to 200MHz
mmc: dw_mmc-exynos: Add tuning for sdr and ddr timing for USH-I mode

 arch/arm/boot/dts/exynos5422-odroid-core.dtsi      |  8 +++++++-
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi |  1 +
 drivers/mmc/host/dw_mmc-exynos.c                   | 11 +++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)
Signature · 1 line
2.17.1
author
#1 lore raw

PATCH v3 1/7 ARM: dts: exynos5422: Added UHS-I bus speed support

Added support for UHS-I bus speed tuning for SDR50, DDR50 SDR104.

Signed-off-by Anand Moon <[email protected]>

---
[0] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/376263.html
Changes from above.
Fix the subject and commit message.
drop sd-uhs-sdr12 and sd-uhs-sdr25 as host driver is not enable as of now

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 3 +++
 1 file changed, 3 insertions(+)
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +3 -0
index 2f4f40882dab..3a58c935c52a 100644
@@ -370,6 +370,9 @@
 	cap-sd-highspeed;
 	vmmc-supply = <&ldo19_reg>;
 	vqmmc-supply = <&ldo13_reg>;
+	sd-uhs-sdr50;
+	sd-uhs-sdr104;
+	sd-uhs-ddr50;
 };
 
 &nocp_mem0_0 {
Signature · 1 line
2.17.1
author
#2 lore raw

PATCH v3 2/7 ARM: dts: exynos5422: fix regulator min values of LDO13 for Odroid XU3/XU4

In reply to Anand Moon

looking at the schematic sd_2 min/max range from 1.8V/2.8V so fix the regulator min value to 1.8V. Without these changes sdcard will failed to detect on booting when UHS-I tuning is enabled.

Signed-off-by Anand Moon <[email protected]>

---
[0] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/376262.html
Fixed the commit message.
drop the ramp-delay changes.
drop the vmmc-supply/vqmmc-supply changes.

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -1
index 3a58c935c52a..01593f4537ae 100644
@@ -224,7 +224,7 @@
 
 			ldo13_reg: LDO13 {
 				regulator-name = "vddq_mmc2";
-				regulator-min-microvolt = <2800000>;
+				regulator-min-microvolt = <1800000>;
 				regulator-max-microvolt = <2800000>;
 			};
Signature · 1 line
2.17.1
author
#3 lore raw

PATCH v3 3/7 ARM: dts: exynos5422: update maximum frequency for sdcard to 200MHz

In reply to Anand Moon

set the max-frequency to 200MHz for optimal performace.

Signed-off-by Anand Moon <[email protected]>

---
This patch is new to this series.

microSD card.
root at odroid:~# sudo cat /sys/kernel/debug/mmc1/ios

clock:          200000000 Hz
actual clock:   200000000 Hz
vdd:            16 (2.8 ~ 2.9 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      2 (4 bits)
timing spec:    6 (sd uhs SDR104)
signal voltage: 1 (1.80 V)
driver type:    0 (driver type B)
---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -0
index 01593f4537ae..914ee08c7eb2 100644
@@ -368,6 +368,7 @@
 	pinctrl-0 = <&sd2_clk &sd2_cmd &sd2_cd &sd2_bus1 &sd2_bus4>;
 	bus-width = <4>;
 	cap-sd-highspeed;
+	max-frequency = <200000000>;
 	vmmc-supply = <&ldo19_reg>;
 	vqmmc-supply = <&ldo13_reg>;
 	sd-uhs-sdr50;
Signature · 1 line
2.17.1
author
#4 lore raw

PATCH v3 4/7 ARM: dts: exynos5422: use cd-gpio method to detect sd-card

In reply to Anand Moon

add the Card Detect GPIO property for sdcard detect, to fix
the warning message during boot time.
of_get_named_gpiod_flags: can't parse 'cp-gpios' property of node '/soc/mmc at 12220000[0]'

Signed-off-by Anand Moon <[email protected]>

---
[0] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/376261.html
Fixed the commit message.

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -0
index 914ee08c7eb2..03fe02ceae66 100644
@@ -369,6 +369,7 @@
 	bus-width = <4>;
 	cap-sd-highspeed;
 	max-frequency = <200000000>;
+	cd-gpios = <&gpc2 2 GPIO_ACTIVE_LOW>;
 	vmmc-supply = <&ldo19_reg>;
 	vqmmc-supply = <&ldo13_reg>;
 	sd-uhs-sdr50;
Signature · 1 line
2.17.1
author
#5 lore raw

PATCH v3 5/7 ARM: dts: exynos5422: use wp-gpio method to detect sd-card

In reply to Anand Moon

add the Write Protect GPIO property for sdcard, to fix
the warning message during boot time.
of_get_named_gpiod_flags: can't parse 'wp-gpios' property of node '/soc/mmc at 12220000[0]'

Signed-off-by Anand Moon <[email protected]>

---
New patch to this series.
If we keep the wp-gpio GPIO_ACTIVE_LOW sdcard boot into RO mode.

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -0
index 03fe02ceae66..475c38bbc99e 100644
@@ -370,6 +370,7 @@
 	cap-sd-highspeed;
 	max-frequency = <200000000>;
 	cd-gpios = <&gpc2 2 GPIO_ACTIVE_LOW>;
+	wp-gpios = <&gpc4 0 GPIO_ACTIVE_HIGH>;
 	vmmc-supply = <&ldo19_reg>;
 	vqmmc-supply = <&ldo13_reg>;
 	sd-uhs-sdr50;
Signature · 1 line
2.17.1
author
#10 lore raw

PATCH v3 6/7 ARM: dts: exynos5422: update maximum frequency for emmc to 200MHz

In reply to Anand Moon

set the max-frequency to 200MHz for optimal performace of eMMC.

Signed-off-by Anand Moon <[email protected]>

---
This patch is new to this series.

MMC
root at odroid:~# sudo cat /sys/kernel/debug/mmc0/ios

clock:          200000000 Hz
actual clock:   200000000 Hz
vdd:            7 (1.65 - 1.95 V)
bus mode:       2 (push-pull)
chip select:    0 (don't care)
power mode:     2 (on)
bus width:      3 (8 bits)
timing spec:    10 (mmc HS400)
signal voltage: 1 (1.80 V)
driver type:    0 (driver type B)
---
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 1 +
 1 file changed, 1 insertion(+)
arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi +1 -0
index 96e281c0a118..5748f840becc 100644
@@ -386,6 +386,7 @@
 	cap-mmc-highspeed;
 	mmc-hs200-1_8v;
 	mmc-hs400-1_8v;
+	max-frequency = <200000000>;
 	vmmc-supply = <&ldo18_reg>;
 	vqmmc-supply = <&ldo3_reg>;
 };
Signature · 1 line
2.17.1
author
#11 lore raw

PATCH v3 7/7 mmc: dw_mmc-exynos: Add tuning for sdr and ddr timing for USH-I mode

In reply to Anand Moon

Add tuning for sdr and ddr timing for USH-I mode sdr104/sdr50/ddr50 for host controller.

CC Jaehoon Chung <[email protected]>
CC Marek Szyprowski <[email protected]>
Signed-off-by Anand Moon <[email protected]>

---
This patch is new to this series

---
 drivers/mmc/host/dw_mmc-exynos.c | 11 +++++++++++
 1 file changed, 11 insertions(+)
drivers/mmc/host/dw_mmc-exynos.c +11 -0
index ab47b018716a..d46c3439b508 100644
@@ -253,6 +253,8 @@ static void dw_mci_exynos_config_hs400(struct dw_mci *host, u32 timing)
 	if (timing == MMC_TIMING_MMC_HS400) {
 		dqs |= DATA_STROBE_EN;
 		strobe = DQS_CTRL_RD_DELAY(strobe, priv->dqs_delay);
+	} else if (timing == MMC_TIMING_UHS_SDR104) {
+		dqs &= 0xffffff00;
 	} else {
 		dqs &= ~DATA_STROBE_EN;
 	}

@@ -312,6 +314,15 @@ static void dw_mci_exynos_set_ios(struct dw_mci *host, struct mmc_ios *ios)
 		if (ios->bus_width == MMC_BUS_WIDTH_8)
 			wanted <<= 1;
 		break;
+	case MMC_TIMING_UHS_SDR104:
+	case MMC_TIMING_UHS_SDR50:
+		clksel = (priv->sdr_timing & 0xfff8ffff) |
+			(priv->ciu_div << 16);
+		break;
+	case MMC_TIMING_UHS_DDR50:
+		clksel = (priv->ddr_timing & 0xfff8ffff) |
+			(priv->ciu_div << 16);
+		break;
 	default:
 		clksel = priv->sdr_timing;
 	}
Signature · 1 line
2.17.1
maintainer
#12 lore raw
In reply to Anand Moon
Quoted 6 lines · Anand Moon

This is series v3 since my previous patches we incomplete with driver changes missing.

These changes add UHS-I tuning for dw_mmc-exynos driver. Some new patches are added to enhance the performace.

Patches look like based on some older version of kernel tree (or current mainline) and probably they will not apply on my tree. The easiest is to base on top of linux-next or, for DTS patches, on my next/dt branch.

Best regards,
Krzysztof

Quoted 19 lines

Anand Moon (7):
ARM: dts: exynos5422: Added UHS-I bus speed support
ARM: dts: exynos5422: fix regulator min values of LDO13 for Odroid

    XU3/XU4

ARM: dts: exynos5422: update maximum frequency for sdcard to 200MHz
ARM: dts: exynos5422: use cd-gpio method to detect sd-card
ARM: dts: exynos5422: use wp-gpio method to detect sd-card
ARM: dts: exynos5422: update maximum frequency for emmc to 200MHz
mmc: dw_mmc-exynos: Add tuning for sdr and ddr timing for USH-I mode

 arch/arm/boot/dts/exynos5422-odroid-core.dtsi      |  8 +++++++-
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi |  1 +
 drivers/mmc/host/dw_mmc-exynos.c                   | 11 +++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

--
2.17.1

maintainer
#6 lore raw

Re: [PATCHv3 5/7] ARM: dts: exynos5422: use wp-gpio method to detect sd-card

In reply to Anand Moon
Quoted 18 lines · Anand Moon

add the Write Protect GPIO property for sdcard, to fix
the warning message during boot time.
of_get_named_gpiod_flags: can't parse 'wp-gpios' property of node '/soc/mmc at 12220000[0]'

Signed-off-by Anand Moon <[email protected]>

---
New patch to this series.
If we keep the wp-gpio GPIO_ACTIVE_LOW sdcard boot into RO mode.

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +0 -0
index 03fe02ceae66..475c38bbc99e 100644

arch/arm/boot/dts/exynos5422-odroid-core.dtsi line 373

Quoted 4 lines
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -0
@@ -370,6 +370,7 @@
        cap-sd-highspeed;
        max-frequency = <200000000>;
        cd-gpios = <&gpc2 2 GPIO_ACTIVE_LOW>;
+       wp-gpios = <&gpc4 0 GPIO_ACTIVE_HIGH>;

Two issues here:
1. You need also proper pinctrl setting.
2. On schematics the WP is not connected... so how do you know that it is active high? How did you test it? How do you want to test it on microSD?

Best regards,
Krzysztof

Quoted 6 lines
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +0 -1
        vmmc-supply = <&ldo19_reg>;
        vqmmc-supply = <&ldo13_reg>;
        sd-uhs-sdr50;
--

2.17.1

author
#13 lore raw
In reply to Krzysztof Kozlowski

Hi Krzysztof,

Quoted 9 lines · Krzysztof Kozlowski
Quoted 6 lines · Anand Moon

This is series v3 since my previous patches we incomplete with driver changes missing.

These changes add UHS-I tuning for dw_mmc-exynos driver. Some new patches are added to enhance the performace.

Quoted 8 lines

Patches look like based on some older version of kernel tree (or current mainline) and probably they will not apply on my tree. The easiest is to base on top of linux-next or, for DTS patches, on my next/dt branch.

Best regards,
Krzysztof

Yes this patch is based on current mainline.
I will try to re-base on your next/dt branch and resend them.

Best Regards
-Anand

Quoted 19 lines
Quoted 19 lines

Anand Moon (7):
ARM: dts: exynos5422: Added UHS-I bus speed support
ARM: dts: exynos5422: fix regulator min values of LDO13 for Odroid

    XU3/XU4

ARM: dts: exynos5422: update maximum frequency for sdcard to 200MHz
ARM: dts: exynos5422: use cd-gpio method to detect sd-card
ARM: dts: exynos5422: use wp-gpio method to detect sd-card
ARM: dts: exynos5422: update maximum frequency for emmc to 200MHz
mmc: dw_mmc-exynos: Add tuning for sdr and ddr timing for USH-I mode

 arch/arm/boot/dts/exynos5422-odroid-core.dtsi      |  8 +++++++-
 arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi |  1 +
 drivers/mmc/host/dw_mmc-exynos.c                   | 11 +++++++++++
 3 files changed, 19 insertions(+), 1 deletion(-)

--
2.17.1

author
#7 lore raw

Re: [PATCHv3 5/7] ARM: dts: exynos5422: use wp-gpio method to detect sd-card

In reply to Krzysztof Kozlowski

Hi Krzysztof,

Quoted 15 lines · Krzysztof Kozlowski
Quoted 13 lines · Anand Moon

add the Write Protect GPIO property for sdcard, to fix
the warning message during boot time.
of_get_named_gpiod_flags: can't parse 'wp-gpios' property of node '/soc/mmc at 12220000[0]'

Signed-off-by Anand Moon <[email protected]>

---
New patch to this series.
If we keep the wp-gpio GPIO_ACTIVE_LOW sdcard boot into RO mode.

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)
Quoted 12 lines

arch/arm/boot/dts/exynos5422-odroid-core.dtsi line 373

Quoted 9 lines
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -0
index 03fe02ceae66..475c38bbc99e 100644
@@ -370,6 +370,7 @@
        cap-sd-highspeed;
        max-frequency = <200000000>;
        cd-gpios = <&gpc2 2 GPIO_ACTIVE_LOW>;
+       wp-gpios = <&gpc4 0 GPIO_ACTIVE_HIGH>;

Two issues here:
1. You need also proper pinctrl setting.

Thanks for pointing out. Yes proper pinctrl is needed to support this setting. probably pinctrl sd2_wp is needed to support this feature.

Quoted 2 lines

2. On schematics the WP is not connected... so how do you know that it From XU4_MAIN_REV0.1 schematics page 7 "Micro Socket" their is no

connection to WP pin.
but below schematics page "EXYNOS 5422 MMC UFS" it's shows XMMC2WP/GPC4_0/EXT_INT13_0.

Quoted 2 lines

is active high? How did you test it? How do you want to test it on microSD?

I just tested this with the DTS change to GPIO_ACTIVE_LOW which resulted the microSD card booted into RO mode.
So I set this to GPIO_ACTIVE_HIGH just to avoid warning.

I will study the changes requires and then post proper separate patch to support this feature.

Best Regards
-Anand

Quoted 10 lines

Best regards,
Krzysztof

Quoted 6 lines
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +0 -1
        vmmc-supply = <&ldo19_reg>;
        vqmmc-supply = <&ldo13_reg>;
        sd-uhs-sdr50;
--

2.17.1

maintainer
#8 lore raw

Re: [PATCHv3 5/7] ARM: dts: exynos5422: use wp-gpio method to detect sd-card

Quoted 43 lines · Anand Moon

Hi Krzysztof,

Quoted 15 lines · Krzysztof Kozlowski
Quoted 13 lines · Anand Moon

add the Write Protect GPIO property for sdcard, to fix
the warning message during boot time.
of_get_named_gpiod_flags: can't parse 'wp-gpios' property of node '/soc/mmc at 12220000[0]'

Signed-off-by Anand Moon <[email protected]>

---
New patch to this series.
If we keep the wp-gpio GPIO_ACTIVE_LOW sdcard boot into RO mode.

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)
Quoted 12 lines

arch/arm/boot/dts/exynos5422-odroid-core.dtsi line 373

Quoted 9 lines
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -0
index 03fe02ceae66..475c38bbc99e 100644
@@ -370,6 +370,7 @@
        cap-sd-highspeed;
        max-frequency = <200000000>;
        cd-gpios = <&gpc2 2 GPIO_ACTIVE_LOW>;
+       wp-gpios = <&gpc4 0 GPIO_ACTIVE_HIGH>;

Two issues here:
1. You need also proper pinctrl setting.

Thanks for pointing out. Yes proper pinctrl is needed to support this setting. probably pinctrl sd2_wp is needed to support this feature.

Quoted 1 line

2. On schematics the WP is not connected... so how do you know that it

From XU4_MAIN_REV0.1 schematics page 7 "Micro Socket" their is no connection to WP pin.
but below schematics page "EXYNOS 5422 MMC UFS" it's shows XMMC2WP/GPC4_0/EXT_INT13_0.

Quoted 2 lines

is active high? How did you test it? How do you want to test it on microSD?

Quoted 6 lines

I just tested this with the DTS change to GPIO_ACTIVE_LOW which resulted the microSD card booted into RO mode.
So I set this to GPIO_ACTIVE_HIGH just to avoid warning.

I will study the changes requires and then post proper separate patch to support this feature.

Please squash it with cd-gpios change and send it only for the purpose of describing the hardware. They do not have any meaningful change from functional point of view (maybe except slower code as now it goes through gpio subsystem instead of just reading dw-mmc registers).

Please use full sentences in commit msg (so start with capital letter) and remove reference for warning because there is no warning. You can follow up on my change for XU:
https://patchwork.kernel.org/patch/10610985/

Best regards,
Krzysztof

author
#9 lore raw

Re: [PATCHv3 5/7] ARM: dts: exynos5422: use wp-gpio method to detect sd-card

Hi Krzysztof,

Quoted 57 lines · Krzysztof Kozlowski
Quoted 43 lines · Anand Moon

Hi Krzysztof,

Quoted 15 lines · Krzysztof Kozlowski
Quoted 13 lines · Anand Moon

add the Write Protect GPIO property for sdcard, to fix
the warning message during boot time.
of_get_named_gpiod_flags: can't parse 'wp-gpios' property of node '/soc/mmc at 12220000[0]'

Signed-off-by Anand Moon <[email protected]>

---
New patch to this series.
If we keep the wp-gpio GPIO_ACTIVE_LOW sdcard boot into RO mode.

---
 arch/arm/boot/dts/exynos5422-odroid-core.dtsi | 1 +
 1 file changed, 1 insertion(+)
Quoted 12 lines

arch/arm/boot/dts/exynos5422-odroid-core.dtsi line 373

Quoted 9 lines
arch/arm/boot/dts/exynos5422-odroid-core.dtsi +1 -0
index 03fe02ceae66..475c38bbc99e 100644
@@ -370,6 +370,7 @@
        cap-sd-highspeed;
        max-frequency = <200000000>;
        cd-gpios = <&gpc2 2 GPIO_ACTIVE_LOW>;
+       wp-gpios = <&gpc4 0 GPIO_ACTIVE_HIGH>;

Two issues here:
1. You need also proper pinctrl setting.

Thanks for pointing out. Yes proper pinctrl is needed to support this setting. probably pinctrl sd2_wp is needed to support this feature.

Quoted 1 line

2. On schematics the WP is not connected... so how do you know that it

From XU4_MAIN_REV0.1 schematics page 7 "Micro Socket" their is no connection to WP pin.
but below schematics page "EXYNOS 5422 MMC UFS" it's shows XMMC2WP/GPC4_0/EXT_INT13_0.

Quoted 2 lines

is active high? How did you test it? How do you want to test it on microSD?

Quoted 6 lines

I just tested this with the DTS change to GPIO_ACTIVE_LOW which resulted the microSD card booted into RO mode.
So I set this to GPIO_ACTIVE_HIGH just to avoid warning.

I will study the changes requires and then post proper separate patch to support this feature.

Please squash it with cd-gpios change and send it only for the purpose of describing the hardware. They do not have any meaningful change from functional point of view (maybe except slower code as now it goes through gpio subsystem instead of just reading dw-mmc registers).

Quoted 5 lines

Please use full sentences in commit msg (so start with capital letter) and remove reference for warning because there is no warning. You can follow up on my change for XU:
https://patchwork.kernel.org/patch/10610985/

Ok I have tried to squash the changes into single patch.

Quoted 2 lines

Best regards,
Krzysztof

Best Regards
-Anand