dmaengine: sh: rz-dmac: Add helper to compute the lmdesc address

Add a the rz_dmac_lmdesc_addr() helper function to compute the lmdesc
address, to make the code easier to understand. The helper will be used in
subsequent patches.

Reviewed-by: Frank Li <Frank.Li@nxp.com>
Tested-by: John Madieu <john.madieu.xa@bp.renesas.com>
Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@bp.renesas.com>
Tested-by: Tommaso Merciai <tommaso.merciai.xr@bp.renesas.com>
Link: https://patch.msgid.link/20260526084710.3491480-6-claudiu.beznea@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>

diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c
index 40ddf534c094864820a9ea2021f8b9d78b9088e2..c48858b68dee631acda0fa517d4bf59b49ce56ba 100644 (file)
--- a/drivers/dma/sh/rz-dmac.c
+++ b/drivers/dma/sh/rz-dmac.c
@@ -259,6 +259,12 @@ static void rz_lmdesc_setup(struct rz_dmac_chan *channel,
  * Descriptors preparation
  */
 
+static u32 rz_dmac_lmdesc_addr(struct rz_dmac_chan *channel, struct rz_lmdesc *lmdesc)
+{
+       return channel->lmdesc.base_dma +
+              (sizeof(struct rz_lmdesc) * (lmdesc - channel->lmdesc.base));
+}
+
 static void rz_dmac_lmdesc_recycle(struct rz_dmac_chan *channel)
 {
        struct rz_lmdesc *lmdesc = channel->lmdesc.head;
@@ -284,9 +290,7 @@ static void rz_dmac_enable_hw(struct rz_dmac_chan *channel)
 
        rz_dmac_lmdesc_recycle(channel);
 
-       nxla = channel->lmdesc.base_dma +
-               (sizeof(struct rz_lmdesc) * (channel->lmdesc.head -
-                                            channel->lmdesc.base));
+       nxla = rz_dmac_lmdesc_addr(channel, channel->lmdesc.head);
 
        chstat = rz_dmac_ch_readl(channel, CHSTAT, 1);
        if (!(chstat & CHSTAT_EN)) {