netdev - [PATCH v3 6/6] can: rcar_canfd: Add has_gerfl_eef to struct rcar_canfd_hw

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Date:   Thu, 27 Oct 2022 09:21:58 +0100
From:   Biju Das <biju.das.jz@...renesas.com>
To:     Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     Biju Das <biju.das.jz@...renesas.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Stefan Mätje <stefan.maetje@....eu>,
        Ulrich Hecht <uli+renesas@...nd.eu>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        Biju Das <biju.das@...renesas.com>,
        linux-renesas-soc@...r.kernel.org
Subject: [PATCH v3 6/6] can: rcar_canfd: Add has_gerfl_eef to struct rcar_canfd_hw_info

R-Car has ECC error flags in global error interrupts whereas it is
not available on RZ/G2L.

Add has_gerfl_eef to struct rcar_canfd_hw_info so that rcar_canfd_
global_error() will process ECC errors only for R-Car.

whilst, this patch fixes the below checkpatch warnings
  CHECK: Unnecessary parentheses around 'ch == 0'
  CHECK: Unnecessary parentheses around 'ch == 1'

Signed-off-by: Biju Das <biju.das.jz@...renesas.com>
---
v2->v3:
 * No change.
v1->v2:
 * Replaced info->has_gerfl to gpriv->info->has_gerfl and wrapped
   the ECC error flag check within single if statement.
---
 drivers/net/can/rcar/rcar_canfd.c | 19 ++++++++++++-------
 1 file changed, 12 insertions(+), 7 deletions(-)

diff --git a/drivers/net/can/rcar/rcar_canfd.c b/drivers/net/can/rcar/rcar_canfd.c
index f8eafb132b39..00242eac377d 100644
--- a/drivers/net/can/rcar/rcar_canfd.c
+++ b/drivers/net/can/rcar/rcar_canfd.c
@@ -523,6 +523,7 @@ struct rcar_canfd_hw_info {
 	/* hardware features */
 	unsigned shared_global_irqs:1;	/* Has shared global irqs */
 	unsigned multi_channel_irqs:1;	/* Has multiple channel irqs */
+	unsigned has_gerfl_eef:1;	/* Has ECC Error Flag */
 };
 
 /* Channel priv data */
@@ -596,6 +597,7 @@ static const struct rcar_canfd_hw_info rcar_gen3_hw_info = {
 	.max_channels = 2,
 	.postdiv = 2,
 	.shared_global_irqs = 1,
+	.has_gerfl_eef = 1,
 };
 
 static const struct rcar_canfd_hw_info rzg2l_hw_info = {
@@ -608,6 +610,7 @@ static const struct rcar_canfd_hw_info r8a779a0_hw_info = {
 	.max_channels = 8,
 	.postdiv = 2,
 	.shared_global_irqs = 1,
+	.has_gerfl_eef = 1,
 };
 
 /* Helper functions */
@@ -955,13 +958,15 @@ 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");
-		stats->tx_dropped++;
+	if (gpriv->info->has_gerfl_eef) {
+		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");
+			stats->tx_dropped++;
+		}
 	}
 	if (gerfl & RCANFD_GERFL_MES) {
 		sts = rcar_canfd_read(priv->base,
-- 
2.25.1