[PATCH 5/6] gpu/drm: ingenic: Check for display size in CRTC atomic check

[Paul Cercueil]

Check that the requested display size isn't above the limits supported
by the CRTC.

- JZ4750 and older support up to 800x600;
- JZ4755 supports up to 1024x576;
- JZ4760 and JZ4770 support up to 720p;
- JZ4780 supports up to 2k.

Signed-off-by: Paul Cercueil <p...@crapouillou.net>
---
 drivers/gpu/drm/ingenic/ingenic-drm.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ingenic/ingenic-drm.c 
b/drivers/gpu/drm/ingenic/ingenic-drm.c
index 4538b081b0c5..d578c4cb6009 100644
--- a/drivers/gpu/drm/ingenic/ingenic-drm.c
+++ b/drivers/gpu/drm/ingenic/ingenic-drm.c
@@ -152,6 +152,7 @@ struct ingenic_dma_hwdesc {
 
 struct jz_soc_info {
        bool needs_dev_clk;
+       unsigned int max_width, max_height;
 };
 
 struct ingenic_drm {
@@ -163,6 +164,7 @@ struct ingenic_drm {
        struct device *dev;
        struct regmap *map;
        struct clk *lcd_clk, *pix_clk;
+       const struct jz_soc_info *soc_info;
 
        struct ingenic_dma_hwdesc *dma_hwdesc;
        dma_addr_t dma_hwdesc_phys;
@@ -325,6 +327,10 @@ static int ingenic_drm_crtc_atomic_check(struct drm_crtc 
*crtc,
        if (!drm_atomic_crtc_needs_modeset(state))
                return 0;
 
+       if (state->mode.hdisplay > priv->soc_info->max_height ||
+           state->mode.vdisplay > priv->soc_info->max_width)
+               return -EINVAL;
+
        rate = clk_round_rate(priv->pix_clk,
                              state->adjusted_mode.clock * 1000);
        if (rate < 0)
@@ -619,6 +625,7 @@ static int ingenic_drm_probe(struct platform_device *pdev)
        if (!priv)
                return -ENOMEM;
 
+       priv->soc_info = soc_info;
        priv->dev = dev;
        drm = &priv->drm;
        drm->dev_private = priv;
@@ -634,7 +641,7 @@ static int ingenic_drm_probe(struct platform_device *pdev)
        drm_mode_config_init(drm);
        drm->mode_config.min_width = 0;
        drm->mode_config.min_height = 0;
-       drm->mode_config.max_width = 800;
+       drm->mode_config.max_width = soc_info->max_width;
        drm->mode_config.max_height = 4095;
        drm->mode_config.funcs = &ingenic_drm_mode_config_funcs;
 
@@ -812,10 +819,14 @@ static int ingenic_drm_remove(struct platform_device 
*pdev)
 
 static const struct jz_soc_info jz4740_soc_info = {
        .needs_dev_clk = true,
+       .max_width = 800,
+       .max_height = 600,
 };
 
 static const struct jz_soc_info jz4725b_soc_info = {
        .needs_dev_clk = false,
+       .max_width = 800,
+       .max_height = 600,
 };
 
 static const struct of_device_id ingenic_drm_of_match[] = {
-- 
2.24.0

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