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[2003:f1:3713:2e00:428d:5cff:feb9:9db8]) by smtp.googlemail.com with ESMTPSA id b65sm14624702wmc.30.2020.05.17.15.29.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 17 May 2020 15:29:32 -0700 (PDT) From: Martin Blumenstingl To: ulf.hansson@linaro.org, linux-mmc@vger.kernel.org, linux-amlogic@lists.infradead.org Subject: [PATCH 1/2] mmc: host: meson-mx-sdhc: fix manual RX FIFO flushing Date: Mon, 18 May 2020 00:29:06 +0200 Message-Id: <20200517222907.1277787-1-martin.blumenstingl@googlemail.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200517_152935_854089_80343581 X-CRM114-Status: GOOD ( 14.22 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Martin Blumenstingl , Thomas Graichen , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org For Meson8 and Meson8b SoCs the vendor driver follows the following pattern: - for eMMC and SD cards in .set_pdma it sets: pdma->rxfifo_manual_flush = 1; - for SDIO cards in .set_pdma it sets: pdma->rxfifo_manual_flush = 0; - before syncing the DMA read buffer is sets: pdma->rxfifo_manual_flush |= 0x02; Set the second bit of MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH without clearing the first bit before syncing the DMA read buffer. This fixes a problem where Meson8 and Meson8b SoCs would read random garbage from SD cards. It is not clear why it worked for eMMC cards. This manifested in the following errors when plugging in an SD card: unrecognised SCR structure version Fixes: 53ded1b676d199 ("mmc: host: meson-mx-sdhc: new driver for the Amlogic Meson SDHC host") Cc: Thomas Graichen Signed-off-by: Martin Blumenstingl --- drivers/mmc/host/meson-mx-sdhc.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/meson-mx-sdhc.c b/drivers/mmc/host/meson-mx-sdhc.c index 5c00958d7754..53e3f6a4245a 100644 --- a/drivers/mmc/host/meson-mx-sdhc.c +++ b/drivers/mmc/host/meson-mx-sdhc.c @@ -586,10 +586,17 @@ static irqreturn_t meson_mx_sdhc_irq_thread(int irq, void *irq_data) cmd->data->flags & MMC_DATA_READ) { meson_mx_sdhc_wait_cmd_ready(host->mmc); + /* + * If MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH was + * previously 0x1 then it has to be set to 0x3. If it + * was 0x0 before then it has to be set to 0x2. Without + * this reading SD cards sometimes transfers garbage, + * which results in cards not being detected due to: + * unrecognised SCR structure version + */ val = FIELD_PREP(MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, 2); - regmap_update_bits(host->regmap, MESON_SDHC_PDMA, - MESON_SDHC_PDMA_RXFIFO_MANUAL_FLUSH, + regmap_update_bits(host->regmap, MESON_SDHC_PDMA, val, val); } -- 2.26.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel