linux-kernel - [PATCH] drm/tegra: fix 32-bit DMA address calculation

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Message-Id: <20210514135328.2543521-1-arnd@kernel.org>
Date:   Fri, 14 May 2021 15:53:18 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Thierry Reding <thierry.reding@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Jonathan Hunter <jonathanh@...dia.com>
Cc:     Arnd Bergmann <arnd@...db.de>, Maxime Ripard <maxime@...no.tech>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, dri-devel@...ts.freedesktop.org,
        linux-tegra@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] drm/tegra: fix 32-bit DMA address calculation

From: Arnd Bergmann <arnd@...db.de>

gcc points out an invalid bit shift operation on 32-bit architectures
with 64-bit dma_addr_t:

drivers/gpu/drm/tegra/hub.c: In function 'tegra_shared_plane_atomic_update':
include/vdso/bits.h:7:40: error: left shift count >= width of type [-Werror=shift-count-overflow]
    7 | #define BIT(nr)                 (UL(1) << (nr))
      |                                        ^~
drivers/gpu/drm/tegra/hub.c:513:25: note: in expansion of macro 'BIT'
  513 |                 base |= BIT(39);
      |                         ^~~

Use the correct BIT_ULL() macro to always generate a 64-bit mask.
Fixes: 7b6f846785f4 ("drm/tegra: Support sector layout on Tegra194")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/gpu/drm/tegra/hub.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/tegra/hub.c b/drivers/gpu/drm/tegra/hub.c
index 79bff8b48271..bfae8a02f55b 100644
--- a/drivers/gpu/drm/tegra/hub.c
+++ b/drivers/gpu/drm/tegra/hub.c
@@ -510,7 +510,7 @@ static void tegra_shared_plane_atomic_update(struct drm_plane *plane,
 	 * dGPU sector layout.
 	 */
 	if (tegra_plane_state->tiling.sector_layout == TEGRA_BO_SECTOR_LAYOUT_GPU)
-		base |= BIT(39);
+		base |= BIT_ULL(39);
 #endif
 
 	tegra_plane_writel(p, tegra_plane_state->format, DC_WIN_COLOR_DEPTH);
-- 
2.29.2