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Date:   Fri, 28 Oct 2022 12:06:45 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Biju Das <biju.das.jz@...renesas.com>
Cc:     Ulrich Hecht <uli+renesas@...nd.eu>, linux-can@...r.kernel.org,
        netdev@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH] can: rcar_canfd: Add missing ECC error checks for channels 2-7

When introducing support for R-Car V3U, which has 8 instead of 2
channels, the ECC error bitmask was extended to take into account the
extra channels, but rcar_canfd_global_error() was not updated to act
upon the extra bits.

Replace the RCANFD_GERFL_EEF[01] macros by a new macro that takes the
channel number, fixing R-Car V3U while simplifying the code.

Fixes: 45721c406dcf50d4 ("can: rcar_canfd: Add support for r8a779a0 SoC")
Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
Compile-tested only.

This patch conflicts with "[PATCH v3 6/6] can: rcar_canfd: Add
has_gerfl_eef to struct rcar_canfd_hw_info"[1].  Sorry for that.

[1] https://lore.kernel.org/all/20221027082158.95895-7-biju.das.jz@bp.renesas.com/
---
 drivers/net/can/rcar/rcar_canfd.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index 710bd0e9c3c08c02..7cca9b7507cc6805 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -81,8 +81,7 @@ enum rcanfd_chip_id {
 
 /* RSCFDnCFDGERFL / RSCFDnGERFL */
 #define RCANFD_GERFL_EEF0_7		GENMASK(23, 16)
-#define RCANFD_GERFL_EEF1		BIT(17)
-#define RCANFD_GERFL_EEF0		BIT(16)
+#define RCANFD_GERFL_EEF(ch)		BIT(16 + (ch))
 #define RCANFD_GERFL_CMPOF		BIT(3)	/* CAN FD only */
 #define RCANFD_GERFL_THLES		BIT(2)
 #define RCANFD_GERFL_MES		BIT(1)
@@ -90,7 +89,7 @@ enum rcanfd_chip_id {
 
 #define RCANFD_GERFL_ERR(gpriv, x) \
 	((x) & (reg_v3u(gpriv, RCANFD_GERFL_EEF0_7, \
-			RCANFD_GERFL_EEF0 | RCANFD_GERFL_EEF1) | \
+			RCANFD_GERFL_EEF(0) | RCANFD_GERFL_EEF(1)) | \
 		RCANFD_GERFL_MES | \
 		((gpriv)->fdmode ? RCANFD_GERFL_CMPOF : 0)))
 
@@ -936,12 +935,8 @@ static void rcar_canfd_global_error(struct net_device *ndev)
 	u32 ridx = ch + RCANFD_RFFIFO_IDX;
 
 	gerfl = rcar_canfd_read(priv->base, RCANFD_GERFL);
-	if ((gerfl & RCANFD_GERFL_EEF0) && (ch == 0)) {
-		netdev_dbg(ndev, "Ch0: ECC Error flag\n");
-		stats->tx_dropped++;
-	}
-	if ((gerfl & RCANFD_GERFL_EEF1) && (ch == 1)) {
-		netdev_dbg(ndev, "Ch1: ECC Error flag\n");
+	if (gerfl & RCANFD_GERFL_EEF(ch)) {
+		netdev_dbg(ndev, "Ch%u: ECC Error flag\n", ch);
 		stats->tx_dropped++;
 	}
 	if (gerfl & RCANFD_GERFL_MES) {
-- 
2.25.1

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