1 files changed, 98 insertions, 0 deletions
diff --git a/mmc-sdhci-iproc-Enable-eMMC-DDR-3.3V-support-for-bcm2711.patch b/mmc-sdhci-iproc-Enable-eMMC-DDR-3.3V-support-for-bcm2711.patch
new file mode 100644
index 000000000..6f5cf820b
--- /dev/null
+++ b/mmc-sdhci-iproc-Enable-eMMC-DDR-3.3V-support-for-bcm2711.patch
@@ -0,0 +1,98 @@
+From patchwork Fri Aug 28 21:47:14 2020
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+X-Patchwork-Submitter: Stefan Wahren <stefan.wahren@i2se.com>
+X-Patchwork-Id: 11743769
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+From: Stefan Wahren <stefan.wahren@i2se.com>
+To: Adrian Hunter <adrian.hunter@intel.com>,
+        Ulf Hansson <ulf.hansson@linaro.org>,
+        Ray Jui <rjui@broadcom.com>,
+        Scott Branden <sbranden@broadcom.com>
+Cc: Florian Fainelli <f.fainelli@gmail.com>,
+        Nicolas Saenz Julienne <nsaenzjulienne@suse.de>,
+        Matthias Brugger <mbrugger@suse.com>,
+        bcm-kernel-feedback-list@broadcom.com, linux-mmc@vger.kernel.org,
+        linux-arm-kernel@lists.infradead.org,
+        Stefan Wahren <stefan.wahren@i2se.com>
+Subject: [PATCH] mmc: sdhci-iproc: Enable eMMC DDR 3.3V support for bcm2711
+Date: Fri, 28 Aug 2020 23:47:14 +0200
+Message-Id: <1598651234-29826-1-git-send-email-stefan.wahren@i2se.com>
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+Sender: linux-mmc-owner@vger.kernel.org
+Precedence: bulk
+List-ID: <linux-mmc.vger.kernel.org>
+X-Mailing-List: linux-mmc@vger.kernel.org
+
+The emmc2 interface on the bcm2711 supports DDR modes for eMMC devices
+running at 3.3V. This allows to run eMMC module with 3.3V signaling voltage
+at DDR52 mode on the Raspberry Pi 4 using a SD adapter:
+
+  clock: 52000000 Hz
+  actual clock: 50000000 Hz
+  vdd: 21 (3.3 ~ 3.4 V)
+  bus mode: 2 (push-pull)
+  chip select: 0 (don't care)
+  power mode: 2 (on)
+  bus width: 2 (4 bits)
+  timing spec: 8 (mmc DDR52)
+  signal voltage: 0 (3.30 V)
+  driver type: 0 (driver type B)
+
+Link: https://github.com/raspberrypi/linux/issues/3802
+Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
+---
+ drivers/mmc/host/sdhci-iproc.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+diff --git a/drivers/mmc/host/sdhci-iproc.c b/drivers/mmc/host/sdhci-iproc.c
+index e2d8dfe..b540aa6 100644
+--- a/drivers/mmc/host/sdhci-iproc.c
++++ b/drivers/mmc/host/sdhci-iproc.c
+@@ -283,6 +283,7 @@ static const struct sdhci_pltfm_data sdhci_bcm2711_pltfm_data = {
+ 
+ static const struct sdhci_iproc_data bcm2711_data = {
+ 	.pdata = &sdhci_bcm2711_pltfm_data,
++	.mmc_caps = MMC_CAP_3_3V_DDR,
+ };
+ 
+ static const struct of_device_id sdhci_iproc_of_match[] = {