[PATCH] drm/exynos: fimd: Get signal polarities from device tree

[Tomasz Figa]

This patch modifies the driver to perform two stage parsing of video
timings from device tree, to get timing information as struct videomode,
which contains more data than struct fb_videomode.

Thanks to this change, information about polarity of control signals
(VSYNC, HSYNC, VDEN, VCLK) can be retrieved, in addition to standard
video timings.

Signed-off-by: Tomasz Figa <tomasz.figa at gmail.com>
---
 drivers/gpu/drm/exynos/exynos_drm_fimd.c | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/exynos/exynos_drm_fimd.c 
b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
index a1669d4..9023efa 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_fimd.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_fimd.c
@@ -21,7 +21,9 @@
 #include <linux/pm_runtime.h>

 #include <video/of_display_timing.h>
+#include <video/of_videomode.h>
 #include <video/samsung_fimd.h>
+#include <video/videomode.h>
 #include <drm/exynos_drm.h>

 #include "exynos_drm_drv.h"
@@ -928,18 +930,30 @@ static int fimd_probe(struct platform_device *pdev)
        DRM_DEBUG_KMS("%s\n", __FILE__);

        if (pdev->dev.of_node) {
+               struct videomode vm;
+
                pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
                if (!pdata) {
                        DRM_ERROR("memory allocation for pdata failed\n");
                        return -ENOMEM;
                }

-               ret = of_get_fb_videomode(dev->of_node, &pdata->panel.timing,
-                                       OF_USE_NATIVE_MODE);
+               ret = of_get_videomode(dev->of_node, &vm, OF_USE_NATIVE_MODE);
                if (ret) {
                        DRM_ERROR("failed: of_get_fb_videomode() : %d\n", ret);
                        return ret;
                }
+
+               fb_videomode_from_videomode(&vm, &pdata->panel.timing);
+
+               if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
+                       pdata->vidcon1 |= VIDCON1_INV_VSYNC;
+               if (vm.flags & DISPLAY_FLAGS_HSYNC_LOW)
+                       pdata->vidcon1 |= VIDCON1_INV_HSYNC;
+               if (vm.flags & DISPLAY_FLAGS_DE_LOW)
+                       pdata->vidcon1 |= VIDCON1_INV_VDEN;
+               if (vm.flags & DISPLAY_FLAGS_PIXDATA_NEGEDGE)
+                       pdata->vidcon1 |= VIDCON1_INV_VCLK;
        } else {
                pdata = pdev->dev.platform_data;
                if (!pdata) {
-- 
1.8.2.1