linux-kernel - [PATCH] mmc: sunxi-mmc: Fix DMA descriptors allocated above 32 bits

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Date:   Sun, 24 Apr 2022 18:17:50 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Ulf Hansson <ulf.hansson@...aro.org>, linux-mmc@...r.kernel.org
Cc:     Samuel Holland <samuel@...lland.org>,
        Andre Przywara <andre.przywara@....com>,
        Chen-Yu Tsai <wens@...e.org>,
        Jernej Skrabec <jernej.skrabec@...il.com>,
        Maxime Ripard <maxime@...no.tech>,
        Yangtao Li <frank@...winnertech.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-sunxi@...ts.linux.dev
Subject: [PATCH] mmc: sunxi-mmc: Fix DMA descriptors allocated above 32 bits

Newer variants of the MMC controller support a 34-bit physical address
space by using word addresses instead of byte addresses. However, the
code truncates the DMA descriptor address to 32 bits before applying the
shift. This breaks DMA for descriptors allocated above the 32-bit limit.

Fixes: 3536b82e5853 ("mmc: sunxi: add support for A100 mmc controller")
Signed-off-by: Samuel Holland <samuel@...lland.org>
---

 drivers/mmc/host/sunxi-mmc.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index c62afd212692..46f9e2923d86 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c
@@ -377,8 +377,9 @@ static void sunxi_mmc_init_idma_des(struct sunxi_mmc_host *host,
 		pdes[i].buf_addr_ptr1 =
 			cpu_to_le32(sg_dma_address(&data->sg[i]) >>
 				    host->cfg->idma_des_shift);
-		pdes[i].buf_addr_ptr2 = cpu_to_le32((u32)next_desc >>
-						    host->cfg->idma_des_shift);
+		pdes[i].buf_addr_ptr2 =
+			cpu_to_le32(next_desc >>
+				    host->cfg->idma_des_shift);
 	}
 
 	pdes[0].config |= cpu_to_le32(SDXC_IDMAC_DES0_FD);
-- 
2.35.1