linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Shaik Sajida Bhanu <sbhanu@codeaurora.org>
To: adrian.hunter@intel.com, ulf.hansson@linaro.org, robh+dt@kernel.org
Cc: asutoshd@codeaurora.org, stummala@codeaurora.org,
	pragalla@codeaurora.org, nitirawa@codeaurora.org,
	rampraka@codeaurora.org, sayalil@codeaurora.org,
	sartgarg@codeaurora.org, cang@codeaurora.org,
	linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org, devicetree@vger.kernel.org,
	agross@kernel.org, bjorn.andersson@linaro.org,
	Shaik Sajida Bhanu <sbhanu@codeaurora.org>
Subject: [PATCH V1] arm64: dts: qcom: sc7180: Use maximum drive strength values for eMMC
Date: Mon, 16 Aug 2021 22:20:50 +0530	[thread overview]
Message-ID: <1629132650-26277-1-git-send-email-sbhanu@codeaurora.org> (raw)

The current drive strength values are not sufficient on non discrete
boards and this leads to CRC errors during switching to HS400 enhanced
strobe mode.

Hardware simulation results on non discrete boards shows up that use the
maximum drive strength values for data and command lines could helps
in avoiding these CRC errors.

So, update data and command line drive strength values to maximum.

Signed-off-by: Shaik Sajida Bhanu <sbhanu@codeaurora.org>
---
 arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
index 0f2b3c0..79d7aa6 100644
--- a/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
+++ b/arch/arm64/boot/dts/qcom/sc7180-trogdor.dtsi
@@ -1524,13 +1524,13 @@ ap_spi_fp: &spi10 {
 		pinconf-cmd {
 			pins = "sdc1_cmd";
 			bias-pull-up;
-			drive-strength = <10>;
+			drive-strength = <16>;
 		};
 
 		pinconf-data {
 			pins = "sdc1_data";
 			bias-pull-up;
-			drive-strength = <10>;
+			drive-strength = <16>;
 		};
 
 		pinconf-rclk {
-- 
QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member 
of Code Aurora Forum, hosted by The Linux Foundation


             reply	other threads:[~2021-08-16 16:51 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-16 16:50 Shaik Sajida Bhanu [this message]
2021-08-17 13:58 ` [PATCH V1] arm64: dts: qcom: sc7180: Use maximum drive strength values for eMMC Doug Anderson
2021-08-19 13:44   ` Doug Anderson
2021-09-23 20:19     ` Doug Anderson
2021-09-23 20:30 ` (subset) " Bjorn Andersson

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1629132650-26277-1-git-send-email-sbhanu@codeaurora.org \
    --to=sbhanu@codeaurora.org \
    --cc=adrian.hunter@intel.com \
    --cc=agross@kernel.org \
    --cc=asutoshd@codeaurora.org \
    --cc=bjorn.andersson@linaro.org \
    --cc=cang@codeaurora.org \
    --cc=devicetree@vger.kernel.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mmc@vger.kernel.org \
    --cc=nitirawa@codeaurora.org \
    --cc=pragalla@codeaurora.org \
    --cc=rampraka@codeaurora.org \
    --cc=robh+dt@kernel.org \
    --cc=sartgarg@codeaurora.org \
    --cc=sayalil@codeaurora.org \
    --cc=stummala@codeaurora.org \
    --cc=ulf.hansson@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).