[PATCH] drm/hisilicon: Checked the resolution is valid before connector

[Thomas Zimmermann]

Hi

Am 28.12.19 um 01:59 schrieb Tian Tao:
> In the previous version, the callback function mode_valid of
> drm_connector_helper_funcs directly returned MODE_OK. Now we will
> ensure that the resolution is correct and return MODE_OK, otherwise
> return MODE_NOMODE.
> 
> Signed-off-by: Tian Tao <tiantao6 at hisilicon.com>
> Signed-off-by: Gong junjie <gongjunjie2 at huawei.com>
> ---
>  drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c | 41 ++++++++++++++++++++++--
>  1 file changed, 39 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> index 6d98fdc..3d08210 100644
> --- a/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> +++ b/drivers/gpu/drm/hisilicon/hibmc/hibmc_drm_vdac.c
> @@ -11,22 +11,59 @@
>   *	Jianhua Li <lijianhua at huawei.com>
>   */
>  
> +#include <drm/drm_gem_vram_helper.h>
>  #include <drm/drm_atomic_helper.h>
>  #include <drm/drm_probe_helper.h>
> +#include <drm/drm_crtc_helper.h>
>  #include <drm/drm_print.h>
>  
>  #include "hibmc_drm_drv.h"
>  #include "hibmc_drm_regs.h"
>  
> +static const struct hibmc_resolution {
> +	int w;
> +	int h;
> +} hibmc_modetables[] = {
> +	{640, 480}, {800, 600}, {1024, 768}, {1152, 864}, {1280, 768},
> +	{1280, 720}, {1280, 960}, {1280, 1024}, {1440, 900}, {1600, 900},
> +	{1600, 1200}, {1920, 1080}, {1920, 1200}
> +};

There's already a mode table for PLL programming in hibmc_drm_de.c.
Rather than duplicating the information, maybe make the existing table
available for the mode-checking code.

> +
> +static int hibmc_valid_mode(int w, int h)
> +{
> +	int size = sizeof(hibmc_modetables) / sizeof(struct hibmc_resolution);
> +	int i;
> +
> +	for (i = 0; i < size; i++) {
> +		if (hibmc_modetables[i].w == w && hibmc_modetables[i].h == h)
> +			return 0;
> +	}
> +
> +	return -1;
> +}
> +
>  static int hibmc_connector_get_modes(struct drm_connector *connector)
>  {
> -	return drm_add_modes_noedid(connector, 800, 600);
> +	int count;
> +
> +	drm_connector_update_edid_property(connector, NULL);
> +	count = drm_add_modes_noedid(connector, 1920, 1200);
> +	drm_set_preferred_mode(connector, 1024, 768);
> +
> +	return count;
>  }
>  
>  static enum drm_mode_status hibmc_connector_mode_valid(struct drm_connector *connector,
>  				      struct drm_display_mode *mode)
>  {
> -	return MODE_OK;
> +	int vrefresh = drm_mode_vrefresh(mode);
> +
> +	if (vrefresh < 59 || vrefresh > 61)
> +		return MODE_NOMODE;
> +	else if (hibmc_valid_mode(mode->hdisplay, mode->vdisplay) != 0)

I'd rather drop hibmc_valid_mode() from the patch and do its tests right
here.

More generally speaking, are these tests really related to the
connector? Both, refresh and resolution are limits of the CRTC. I think
they should be validated in the CRTC code.

Best regards
Thomas

> +		return MODE_NOMODE;
> +	else
> +		return MODE_OK;
>  }
>  
>  static const struct drm_connector_helper_funcs
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer

-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: OpenPGP digital signature
URL: <https://lists.freedesktop.org/archives/dri-devel/attachments/20200106/f0fa1f6e/attachment.sig>