linux-kernel - [PATCH V1] mmc: core: Enable force hw reset

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Date:   Tue, 26 Apr 2022 14:00:18 +0530
From:   Srinivasarao Pathipati <quic_spathi@...cinc.com>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com,
        riteshh@...eaurora.org, asutoshd@...eaurora.org, axboe@...nel.dk,
        avri.altman@....com, kch@...dia.com, CLoehle@...erstone.com,
        swboyd@...omium.org, digetx@...il.com, bigeasy@...utronix.de,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Shaik Sajida Bhanu <sbhanu@...eaurora.org>,
        kamasali <quic_kamasali@...cinc.com>,
        Srinivasarao Pathipati <quic_spathi@...cinc.com>
Subject: [PATCH V1] mmc: core: Enable force hw reset

From: Shaik Sajida Bhanu <sbhanu@...eaurora.org>

During error recovery set need hw reset to handle
ICE error where cqe reset is must.

Signed-off-by: Shaik Sajida Bhanu <sbhanu@...eaurora.org>
Signed-off-by: kamasali <quic_kamasali@...cinc.com>
Signed-off-by: Srinivasarao Pathipati <quic_spathi@...cinc.com>
---
 drivers/mmc/core/block.c      | 8 +++++---
 drivers/mmc/host/cqhci-core.c | 7 +++++--
 include/linux/mmc/host.h      | 1 +
 3 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index b35e7a9..f63bf33 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -1482,10 +1482,12 @@ void mmc_blk_cqe_recovery(struct mmc_queue *mq)
 	pr_debug("%s: CQE recovery start\n", mmc_hostname(host));
 
 	err = mmc_cqe_recovery(host);
-	if (err)
+	if (err || host->need_hw_reset) {
 		mmc_blk_reset(mq->blkdata, host, MMC_BLK_CQE_RECOVERY);
-	else
-		mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
+		if (host->need_hw_reset)
+			host->need_hw_reset = false;
+	}
+	mmc_blk_reset_success(mq->blkdata, MMC_BLK_CQE_RECOVERY);
 
 	pr_debug("%s: CQE recovery done\n", mmc_hostname(host));
 }
diff --git a/drivers/mmc/host/cqhci-core.c b/drivers/mmc/host/cqhci-core.c
index b0d30c3..311b510 100644
--- a/drivers/mmc/host/cqhci-core.c
+++ b/drivers/mmc/host/cqhci-core.c
@@ -812,18 +812,21 @@ static void cqhci_finish_mrq(struct mmc_host *mmc, unsigned int tag)
 irqreturn_t cqhci_irq(struct mmc_host *mmc, u32 intmask, int cmd_error,
 		      int data_error)
 {
-	u32 status;
+	u32 status, ice_err;
 	unsigned long tag = 0, comp_status;
 	struct cqhci_host *cq_host = mmc->cqe_private;
 
 	status = cqhci_readl(cq_host, CQHCI_IS);
 	cqhci_writel(cq_host, status, CQHCI_IS);
+	ice_err = status & (CQHCI_IS_GCE | CQHCI_IS_ICCE);
 
 	pr_debug("%s: cqhci: IRQ status: 0x%08x\n", mmc_hostname(mmc), status);
 
 	if ((status & (CQHCI_IS_RED | CQHCI_IS_GCE | CQHCI_IS_ICCE)) ||
-	    cmd_error || data_error)
+	    cmd_error || data_error || ice_err){
+		mmc->need_hw_reset = true;
 		cqhci_error_irq(mmc, status, cmd_error, data_error);
+	}
 
 	if (status & CQHCI_IS_TCC) {
 		/* read TCN and complete the request */
diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index c193c50..3d00bcf 100644
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -492,6 +492,7 @@ struct mmc_host {
 	int			cqe_qdepth;
 	bool			cqe_enabled;
 	bool			cqe_on;
+	bool                    need_hw_reset;
 
 	/* Inline encryption support */
 #ifdef CONFIG_MMC_CRYPTO
-- 
2.7.4