Received-SPF: pass (google.com: domain of linux-kernel+bounces-51298-linux.lists.archive=gmail.com@vger.kernel.org designates 147.75.80.249 as permitted sender) client-ip=147.75.80.249;
From: Prabhakar <prabhakar.csengg@gmail.com>
To: Geert Uytterhoeven <geert+renesas@glider.be>,
	Conor Dooley <conor@kernel.org>
Cc: linux-riscv@lists.infradead.org,
	linux-renesas-soc@vger.kernel.org,
	linux-kernel@vger.kernel.org,
	Prabhakar <prabhakar.csengg@gmail.com>,
	Biju Das <biju.das.jz@bp.renesas.com>,
	Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>,
	Pavel Machek <pavel@denx.de>
Subject: [PATCH] cache: ax45mp_cache: Align end size to cache boundary in ax45mp_dma_cache_wback()
Date: Sat,  3 Feb 2024 21:26:40 +0000
Message-Id: <20240203212640.129797-1-prabhakar.mahadev-lad.rj@bp.renesas.com>
Precedence: bulk
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit

From: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>

Align the end size to cache boundary size in ax45mp_dma_cache_wback()
callback likewise done in ax45mp_dma_cache_inv() callback.

Additionally return early in case of start == end.

Fixes: d34599bcd2e4 ("cache: Add L2 cache management for Andes AX45MP RISC-V core")
Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
---
 drivers/cache/ax45mp_cache.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/cache/ax45mp_cache.c b/drivers/cache/ax45mp_cache.c
index 57186c58dc84..1d7dd3d2c101 100644
--- a/drivers/cache/ax45mp_cache.c
+++ b/drivers/cache/ax45mp_cache.c
@@ -129,8 +129,12 @@ static void ax45mp_dma_cache_wback(phys_addr_t paddr, size_t size)
 	unsigned long line_size;
 	unsigned long flags;
 
+	if (unlikely(start == end))
+		return;
+
 	line_size = ax45mp_priv.ax45mp_cache_line_size;
 	start = start & (~(line_size - 1));
+	end = ((end + line_size - 1) & (~(line_size - 1)));
 	local_irq_save(flags);
 	ax45mp_cpu_dcache_wb_range(start, end);
 	local_irq_restore(flags);
-- 
2.34.1