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Sat, 15 Apr 2023 03:41:23 -0700 (PDT) From: Adam Ford To: dri-devel@lists.freedesktop.org Cc: m.szyprowski@samsung.com, marex@denx.de, aford@beaconembedded.com, Adam Ford , Rob Herring , Krzysztof Kozlowski , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Inki Dae , Jagan Teki , Andrzej Hajda , Neil Armstrong , Robert Foss , Laurent Pinchart , Jonas Karlman , Jernej Skrabec , David Airlie , Daniel Vetter , Frieder Schrempf , devicetree@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH 5/6] drm: bridge: samsung-dsim: Support non-burst mode Date: Sat, 15 Apr 2023 05:41:02 -0500 Message-Id: <20230415104104.5537-5-aford173@gmail.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230415104104.5537-1-aford173@gmail.com> References: <20230415104104.5537-1-aford173@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230415_034125_115130_BCA4B24D X-CRM114-Status: GOOD ( 14.99 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The high-speed clock is hard-coded to the burst-clock frequency specified in the device tree. However, when using devices like certain bridge chips without burst mode and varying resolutions and refresh rates, it may be necessary to set the high-speed clock dynamically based on the desired pixel clock for the connected device. Signed-off-by: Adam Ford --- drivers/gpu/drm/bridge/samsung-dsim.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/bridge/samsung-dsim.c b/drivers/gpu/drm/bridge/samsung-dsim.c index c48db27adafe..5aa3a44f15ec 100644 --- a/drivers/gpu/drm/bridge/samsung-dsim.c +++ b/drivers/gpu/drm/bridge/samsung-dsim.c @@ -659,11 +659,21 @@ static unsigned long samsung_dsim_set_pll(struct samsung_dsim *dsi, static int samsung_dsim_enable_clock(struct samsung_dsim *dsi) { - unsigned long hs_clk, byte_clk, esc_clk; + unsigned long hs_clk, byte_clk, esc_clk, pix_clk; unsigned long esc_div; u32 reg; + struct drm_display_mode *m = &dsi->mode; + int bpp = mipi_dsi_pixel_format_to_bpp(dsi->format); + + /* m->clock is in KHz */ + pix_clk = m->clock * 1000; + + /* Use burst_clk_rate for burst mode, otherwise use the pix_clk */ + if ((dsi->mode_flags & MIPI_DSI_MODE_VIDEO_BURST) && dsi->burst_clk_rate) + hs_clk = samsung_dsim_set_pll(dsi, dsi->burst_clk_rate); + else + hs_clk = samsung_dsim_set_pll(dsi, DIV_ROUND_UP(pix_clk * bpp, dsi->lanes)); - hs_clk = samsung_dsim_set_pll(dsi, dsi->burst_clk_rate); if (!hs_clk) { dev_err(dsi->dev, "failed to configure DSI PLL\n"); return -EFAULT; -- 2.39.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel