linux-kernel - [PATCH 1/5] mmc: sdhci: Tidy reading 136-bit responses

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Date:   Mon, 21 Aug 2017 13:11:28 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Ulf Hansson <ulf.hansson@...aro.org>,
        Adrian Hunter <adrian.hunter@...el.com>
CC:     Rob Herring <robh+dt@...nel.org>, Tony Lindgren <tony@...mide.com>,
        Sekhar Nori <nsekhar@...com>,
        Russell King <linux@...linux.org.uk>,
        Ravikumar Kattekola <rk@...com>, <linux-mmc@...r.kernel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        Kishon Vijay Abraham I <kishon@...com>
Subject: [PATCH 1/5] mmc: sdhci: Tidy reading 136-bit responses

From: Adrian Hunter <adrian.hunter@...el.com>

Read each register only once and move the code to a separate function so
that it is not jammed against the 80 column margin.

Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
 drivers/mmc/host/sdhci.c | 28 ++++++++++++++++++----------
 1 file changed, 18 insertions(+), 10 deletions(-)

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index a1ad2ddadca1..ba639b7851cb 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1173,24 +1173,32 @@ void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
 }
 EXPORT_SYMBOL_GPL(sdhci_send_command);
 
+static void sdhci_read_rsp_136(struct sdhci_host *host, struct mmc_command *cmd)
+{
+	int i, reg;
+
+	for (i = 0; i < 4; i++) {
+		reg = SDHCI_RESPONSE + (3 - i) * 4;
+		cmd->resp[i] = sdhci_readl(host, reg);
+	}
+
+	/* CRC is stripped so we need to do some shifting */
+	for (i = 0; i < 4; i++) {
+		cmd->resp[i] <<= 8;
+		if (i != 3)
+			cmd->resp[i] |= cmd->resp[i + 1] >> 24;
+	}
+}
+
 static void sdhci_finish_command(struct sdhci_host *host)
 {
 	struct mmc_command *cmd = host->cmd;
-	int i;
 
 	host->cmd = NULL;
 
 	if (cmd->flags & MMC_RSP_PRESENT) {
 		if (cmd->flags & MMC_RSP_136) {
-			/* CRC is stripped so we need to do some shifting. */
-			for (i = 0;i < 4;i++) {
-				cmd->resp[i] = sdhci_readl(host,
-					SDHCI_RESPONSE + (3-i)*4) << 8;
-				if (i != 3)
-					cmd->resp[i] |=
-						sdhci_readb(host,
-						SDHCI_RESPONSE + (3-i)*4-1);
-			}
+			sdhci_read_rsp_136(host, cmd);
 		} else {
 			cmd->resp[0] = sdhci_readl(host, SDHCI_RESPONSE);
 		}
-- 
2.11.0