linux-kernel - [PATCH v4 3/6] media: sun6i: Update default CSI

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Date:   Tue, 18 Dec 2018 17:03:17 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Yong Deng <yong.deng@...ewell.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Chen-Yu Tsai <wens@...e.org>, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-sunxi <linux-sunxi@...glegroups.com>,
        linux-amarula@...rulasolutions.com,
        Michael Trimarchi <michael@...rulasolutions.com>
Cc:     Jagan Teki <jagan@...rulasolutions.com>
Subject: [PATCH v4 3/6] media: sun6i: Update default CSI_SCLK for A64

Unfortunately A64 CSI cannot work with default CSI_SCLK rate.

A64 BSP is using 300MHz clock rate as default csi clock,
so sun6i_csi require explicit change to update CSI_SCLK
rate to 300MHZ for A64 SoC's.

So, set the clk_mod to 300MHz only for A64.

Signed-off-by: Jagan Teki <jagan@...rulasolutions.com>
---
 drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
index 9ff61896e4bb..91470edf7581 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
@@ -822,6 +822,11 @@ static int sun6i_csi_resource_request(struct sun6i_csi_dev *sdev,
 		return PTR_ERR(sdev->clk_mod);
 	}
 
+	/* A64 require 300MHz mod clock to operate properly */
+	if (of_device_is_compatible(pdev->dev.of_node,
+				    "allwinner,sun50i-a64-csi"))
+		clk_set_rate_exclusive(sdev->clk_mod, 300000000);
+
 	sdev->clk_ram = devm_clk_get(&pdev->dev, "ram");
 	if (IS_ERR(sdev->clk_ram)) {
 		dev_err(&pdev->dev, "Unable to acquire dram-csi clock\n");
-- 
2.18.0.321.gffc6fa0e3