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From:   Su Yanjun <suyanjun218@gmail.com>
To:     mkl@pengutronix.de, manivannan.sadhasivam@linaro.org,
        thomas.kopp@microchip.com, wg@grandegger.com, davem@davemloft.net,
        kuba@kernel.org, lgirdwood@gmail.com, broonie@kernel.org
Cc:     linux-can@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, Su Yanjun <suyanjun218@gmail.com>
Subject: [PATCH v1] can: mcp251xfd: use regmap_bulk_write for compatibility
Date:   Fri, 22 Jan 2021 11:02:14 +0800
Message-Id: <20210122030214.166334-1-suyanjun218@gmail.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Precedence: bulk

Recently i use mcp2518fd on 4.x kernel which multiple write is not
backported, regmap_raw_write will cause old kernel crash because the
tx buffer in driver is smaller then 2K. Use regmap_bulk_write instead
for compatibility.

Signed-off-by: Su Yanjun <suyanjun218@gmail.com>
---
 drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
index 3dde52669343..ab8aad0a7594 100644
--- a/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
+++ b/drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
@@ -932,6 +932,7 @@ static int mcp251xfd_chip_ecc_init(struct mcp251xfd_priv *priv)
 	void *ram;
 	u32 val = 0;
 	int err;
+	int val_bytes = regmap_get_val_bytes(priv->map_reg);
 
 	ecc->ecc_stat = 0;
 
@@ -947,8 +948,8 @@ static int mcp251xfd_chip_ecc_init(struct mcp251xfd_priv *priv)
 	if (!ram)
 		return -ENOMEM;
 
-	err = regmap_raw_write(priv->map_reg, MCP251XFD_RAM_START, ram,
-			       MCP251XFD_RAM_SIZE);
+	err = regmap_bulk_write(priv->map_reg, MCP251XFD_RAM_START, ram,
+			       MCP251XFD_RAM_SIZE / val_bytes);
 	kfree(ram);
 
 	return err;
-- 
2.25.1