By dereferencing the MIPI command buffer as a u32* we rely on it being
correctly aligned on ARM, but this may not be the case.  Copy it into a
stack variable that will be correctly aligned.

Signed-off-by: John Keeping <redacted>
---
Unchanged in v2
---
  drivers/gpu/drm/rockchip/dw-mipi-dsi.c | 12 +++++++-----
  1 file changed, 7 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
index 03fc096fe1bd..ddbc037e7ced 100644
--- a/drivers/gpu/drm/rockchip/dw-mipi-dsi.c
+++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi.c

@@ -607,10 +607,10 @@ static int dw_mipi_dsi_dcs_short_write(struct dw_mipi_dsi *dsi,
  static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
  				      const struct mipi_dsi_msg *msg)
  {
-	const u32 *tx_buf = msg->tx_buf;
-	int len = msg->tx_len, pld_data_bytes = sizeof(*tx_buf), ret;
+	const u8 *tx_buf = msg->tx_buf;
+	int len = msg->tx_len, pld_data_bytes = sizeof(u32), ret;
  	u32 hdr_val = GEN_HDATA(msg->tx_len) | GEN_HTYPE(msg->type);
-	u32 remainder = 0;
+	u32 remainder;
  	u32 val;
  
  	if (msg->tx_len < 3) {

@@ -621,12 +621,14 @@ static int dw_mipi_dsi_dcs_long_write(struct dw_mipi_dsi *dsi,
  
  	while (DIV_ROUND_UP(len, pld_data_bytes)) {
  		if (len < pld_data_bytes) {
+			remainder = 0;
  			memcpy(&remainder, tx_buf, len);
  			dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
  			len = 0;
  		} else {
-			dsi_write(dsi, DSI_GEN_PLD_DATA, *tx_buf);
-			tx_buf++;
+			memcpy(&remainder, tx_buf, pld_data_bytes);
+			dsi_write(dsi, DSI_GEN_PLD_DATA, remainder);
+			tx_buf += pld_data_bytes;
  			len -= pld_data_bytes;
  		}