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Fri, 17 Aug 2018 17:33:21 +0000 From: Ayan Kumar Halder To: ayan.halder@arm.com, liviu.dudau@arm.com, brian.starkey@arm.com, gustavo@padovan.org, maarten.lankhorst@linux.intel.com, seanpaul@chromium.org, airlied@linux.ie, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: nd@arm.com Subject: [PATCH] drm: Use horizontal and vertical chroma subsampling factor while calculating offsets in the physical address of framebuffer Date: Fri, 17 Aug 2018 18:33:04 +0100 Message-Id: <1534527184-24552-1-git-send-email-ayan.halder@arm.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [217.140.106.49] X-ClientProxiedBy: PR0P264CA0021.FRAP264.PROD.OUTLOOK.COM (2603:10a6:100::33) To AM5PR0801MB1378.eurprd08.prod.outlook.com (2603:10a6:203:1f::20) X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 7f5343fd-4c4e-4f55-e07d-08d60467871b X-MS-Office365-Filtering-HT: Tenant X-Microsoft-Antispam: BCL:0;PCL:0;RULEID:(7020095)(4652040)(8989137)(5600074)(711020)(4618075)(2017052603328)(7153060)(7193020);SRVR:AM5PR0801MB1378; 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The reason being that the planes contain subsampled (ie reduced) data (by a factor of 2) and thus the while calculating the byte position coresponding to the x and y co-ordinates, one needs to be divide it with the sampling factor. Signed-off-by: Ayan Kumar halder --- drivers/gpu/drm/drm_fb_cma_helper.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/drm_fb_cma_helper.c b/drivers/gpu/drm/drm_fb_cma_helper.c index b127061..47e0e2f 100644 --- a/drivers/gpu/drm/drm_fb_cma_helper.c +++ b/drivers/gpu/drm/drm_fb_cma_helper.c @@ -86,14 +86,21 @@ dma_addr_t drm_fb_cma_get_gem_addr(struct drm_framebuffer *fb, { struct drm_gem_cma_object *obj; dma_addr_t paddr; + u8 h_div = 1, v_div = 1; obj = drm_fb_cma_get_gem_obj(fb, plane); if (!obj) return 0; paddr = obj->paddr + fb->offsets[plane]; - paddr += fb->format->cpp[plane] * (state->src_x >> 16); - paddr += fb->pitches[plane] * (state->src_y >> 16); + + if (plane > 0) { + h_div = fb->format->hsub; + v_div = fb->format->vsub; + } + + paddr += (fb->format->cpp[plane] * (state->src_x >> 16)) / h_div; + paddr += (fb->pitches[plane] * (state->src_y >> 16)) / v_div; return paddr; } -- 2.7.4