From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1ACD61DF754; Mon, 12 May 2025 18:03:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747073012; cv=none; b=QXNQGrcSLC6uS5ZUoIoGpPff4rqMtPjesMdhHeUDbaUB+xsuxRfE3/2UDriBroMLI+ZXAcmnRVqIjmjHCcKHwtzQaKZ9kj3dsAOVJH4VIWV4FNDTMuSzOFCzqseCao6IdWvCBl+IeXVl0B+IoiyXkqssUcse6hr4X20+JlYGtMA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1747073012; c=relaxed/simple; bh=QvHIdjj2MemaHUO2f7fg9Kooaos7+1vEBHbTtUPYKVY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=i23DFxy22T5EyToIWdLL5Ybn6jVRU4t3UwemQuK0+U6WwB80k5FIz/P+EOhVY9oyWwRzBtVWcrtJhFEp9TaO9vSTXO4YaCfbiHPEzncAHnclpqkwGqdqy+O36rB2XFOuQ1byMj+PKCl4ohmHTyJ4uigEQjH+Om4XC1j9JvbhwRk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=aPcJz3WE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="aPcJz3WE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 761C5C4CEE7; Mon, 12 May 2025 18:03:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1747073011; bh=QvHIdjj2MemaHUO2f7fg9Kooaos7+1vEBHbTtUPYKVY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=aPcJz3WEWGMipt50C9QfMlyc6awrs+K9gysYlczAAXk/Z1e8z2e6DcVarvckn4cix JJU/iPjMSdCwvvJE3o1RfteKRoGj5XheZHRMkxAAk1TX7LU9VCzT/M0g3h48lr/3QH qbKuxGdrBVVU1kB4y8IJvk0VOenF1EP46199y3Z8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Alexey Klimov , Felix Kuehling , Alex Deucher Subject: [PATCH 6.12 097/184] drm/amdgpu/hdp4: use memcfg register to post the write for HDP flush Date: Mon, 12 May 2025 19:44:58 +0200 Message-ID: <20250512172045.776246938@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250512172041.624042835@linuxfoundation.org> References: <20250512172041.624042835@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.12-stable review patch. If anyone has any objections, please let me know. ------------------ From: Alex Deucher commit f690e3974755a650259a45d71456decc9c96a282 upstream. Reading back the remapped HDP flush register seems to cause problems on some platforms. All we need is a read, so read back the memcfg register. Fixes: c9b8dcabb52a ("drm/amdgpu/hdp4.0: do a posting read when flushing HDP") Reported-by: Alexey Klimov Link: https://lists.freedesktop.org/archives/amd-gfx/2025-April/123150.html Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4119 Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/3908 Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher (cherry picked from commit 5c937b4a6050316af37ef214825b6340b5e9e391) Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c +++ b/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c @@ -42,7 +42,12 @@ static void hdp_v4_0_flush_hdp(struct am { if (!ring || !ring->funcs->emit_wreg) { WREG32((adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2, 0); - RREG32((adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2); + /* We just need to read back a register to post the write. + * Reading back the remapped register causes problems on + * some platforms so just read back the memory size register. + */ + if (adev->nbio.funcs->get_memsize) + adev->nbio.funcs->get_memsize(adev); } else { amdgpu_ring_emit_wreg(ring, (adev->rmmio_remap.reg_offset + KFD_MMIO_REMAP_HDP_MEM_FLUSH_CNTL) >> 2, 0); }