linux-kernel - [PATCH v2] mmc: mmc_test: use erase_arg for mmc

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Date:   Tue, 9 Feb 2021 15:52:14 +0100
From:   <yann.gautier@...s.st.com>
To:     <ulf.hansson@...aro.org>
CC:     <linux@...linux.org.uk>, <linus.walleij@...aro.org>,
        <ludovic.barre@...s.st.com>, <adrian.hunter@...el.com>,
        <marex@...x.de>, <linux-mmc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <yann.gautier@...s.st.com>
Subject: [PATCH v2] mmc: mmc_test: use erase_arg for mmc_erase command

From: Yann Gautier <yann.gautier@...s.st.com>

Since [1], the erase argument for mmc_erase() function is saved in
erase_arg field of card structure. It is preferable to use it instead of
hard-coded MMC_SECURE_ERASE_ARG, which from eMMC 4.51 spec is not
recommended:
"6.6.16 Secure Erase
NOTE Secure Erase is included for backwards compatibility. New system
level implementations (based on v4.51 devices and beyond) should use
Erase combined with Sanitize instead of secure erase."

On STM32MP157C-EV1 board, embedding a THGBMDG5D1LBAIL eMMC, using
MMC_ERASE command with MMC_SECURE_ERASE_ARG may stuck the STM32 SDMMC IP,
if test 37 or test 38 are launched just after a write test, e.g. test 36.
Using the default MMC_ERASE argument from framework with erase_arg,
which default in our case to MMC_DISCARD_ARG does no more trig the
issue.

 [1] commit 01904ff77676 ("mmc: core: Calculate the discard arg only once")

Signed-off-by: Yann Gautier <yann.gautier@...s.st.com>
---

Changes in v2:
- Drop patch 1 from the previous series
- Update comment

 drivers/mmc/core/mmc_test.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mmc/core/mmc_test.c b/drivers/mmc/core/mmc_test.c
index 39a478874ca3..63524551a13a 100644
--- a/drivers/mmc/core/mmc_test.c
+++ b/drivers/mmc/core/mmc_test.c
@@ -2110,7 +2110,7 @@ static int mmc_test_rw_multiple(struct mmc_test_card *test,
 	if (mmc_can_erase(test->card) &&
 	    tdata->prepare & MMC_TEST_PREP_ERASE) {
 		ret = mmc_erase(test->card, dev_addr,
-				size / 512, MMC_SECURE_ERASE_ARG);
+				size / 512, test->card->erase_arg);
 		if (ret)
 			ret = mmc_erase(test->card, dev_addr,
 					size / 512, MMC_ERASE_ARG);
-- 
2.17.1