From 32a69f1487819766d2084ed32b1350b18f971c10 Mon Sep 17 00:00:00 2001 From: Claudiu Beznea Date: Tue, 26 May 2026 11:46:57 +0300 Subject: [PATCH] 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 Tested-by: John Madieu Signed-off-by: Claudiu Beznea Tested-by: Tommaso Merciai Link: https://patch.msgid.link/20260526084710.3491480-6-claudiu.beznea@kernel.org Signed-off-by: Vinod Koul --- drivers/dma/sh/rz-dmac.c | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/drivers/dma/sh/rz-dmac.c b/drivers/dma/sh/rz-dmac.c index 40ddf534c094..c48858b68dee 100644 --- 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)) {