From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Osipenko Subject: [PATCH v2 1/3] drm/tegra: dc: Tune up high priority request controls on Tegra20 Date: Fri, 24 May 2019 21:16:25 +0300 Message-ID: <20190524181627.16490-2-digetx@gmail.com> References: <20190524181627.16490-1-digetx@gmail.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: In-Reply-To: <20190524181627.16490-1-digetx@gmail.com> Sender: linux-kernel-owner@vger.kernel.org To: Thierry Reding Cc: dri-devel@lists.freedesktop.org, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org List-Id: linux-tegra@vger.kernel.org Tegra20 has a high priority request control that allow to configure when display's memory client should perform read requests with a higher priority (Tegra30+ uses other means). Set up the controls for a more aggressive prefetching to reliably avoid FIFO underflow on a lower memory frequency, this allow to safely drop the memory bandwidth requirement by about two times in a most popular cases (only one display active, video overlay inactive, no scaling is done). Signed-off-by: Dmitry Osipenko --- drivers/gpu/drm/tegra/dc.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/tegra/dc.c b/drivers/gpu/drm/tegra/dc.c index 079250c85733..3e13948dcdcd 100644 --- a/drivers/gpu/drm/tegra/dc.c +++ b/drivers/gpu/drm/tegra/dc.c @@ -1828,12 +1828,12 @@ static void tegra_crtc_atomic_enable(struct drm_crtc *crtc, tegra_dc_writel(dc, value, DC_CMD_INT_POLARITY); /* initialize timer */ - value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(0x20) | - WINDOW_B_THRESHOLD(0x20) | WINDOW_C_THRESHOLD(0x20); + value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(0x70) | + WINDOW_B_THRESHOLD(0x30) | WINDOW_C_THRESHOLD(0x70); tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY); - value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(1) | - WINDOW_B_THRESHOLD(1) | WINDOW_C_THRESHOLD(1); + value = CURSOR_THRESHOLD(0) | WINDOW_A_THRESHOLD(0) | + WINDOW_B_THRESHOLD(0) | WINDOW_C_THRESHOLD(0); tegra_dc_writel(dc, value, DC_DISP_DISP_MEM_HIGH_PRIORITY_TIMER); value = VBLANK_INT | WIN_A_UF_INT | WIN_B_UF_INT | WIN_C_UF_INT | -- 2.21.0