From:   Georgi Djakov <quic_c_gdjako@quicinc.com>
To:     <catalin.marinas@arm.com>, <will@kernel.org>, <robdclark@gmail.com>
CC:     <sean@poorly.run>, <robin.murphy@arm.com>, <maz@kernel.org>,
        <arnd@arndb.de>, <linux-arm-kernel@lists.infradead.org>,
        <linux-kernel@vger.kernel.org>, <iommu@lists.linux-foundation.org>
Subject: [RFC 2/2]  drm/msm/gem: Make use of the system cache
Date:   Tue, 16 Nov 2021 15:16:00 -0800
Message-ID: <1637104560-37432-2-git-send-email-quic_c_gdjako@quicinc.com>
In-Reply-To: <1637104560-37432-1-git-send-email-quic_c_gdjako@quicinc.com>
References: <1637104560-37432-1-git-send-email-quic_c_gdjako@quicinc.com>
MIME-Version: 1.0
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Precedence: bulk

Instead of writing to WC cmdstream buffers that go all the way to the main
memory, let's use the system cache to improve the performance.

Signed-off-by: Georgi Djakov <quic_c_gdjako@quicinc.com>
---
 drivers/gpu/drm/msm/msm_gem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 104fdfc14027..921a1c24721e 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -214,7 +214,7 @@ void msm_gem_put_pages(struct drm_gem_object *obj)
 static pgprot_t msm_gem_pgprot(struct msm_gem_object *msm_obj, pgprot_t prot)
 {
 	if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
-		return pgprot_writecombine(prot);
+		return pgprot_syscached(prot);
 	return prot;
 }