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

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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>
This commit is contained in:
Claudiu Beznea 2026-05-26 11:46:57 +03:00 committed by Vinod Koul
parent 38d4d02122
commit 32a69f1487
1 changed files with 7 additions and 3 deletions
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10
drivers/dma/sh/rz-dmac.c
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@ -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)) {