Commit 3c537889 authored by Alex Deucher's avatar Alex Deucher Committed by Dave Airlie
Browse files

drm/radeon/kms: add support for hardcoded edids in rom (v2) 



Some servers hardcode an edid in rom so that they will
work properly with KVMs.  This is a port of the relevant
code from the ddx.

[airlied: reworked to validate edid at boot stage - and
remove special quirk, if there is a valid EDID in the BIOS rom
we'll just try and use it.]

Signed-off-by: default avatarAlex Deucher <alexdeucher@gmail.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 2739d49c

drivers/gpu/drm/drm_edid.c

+15 −15
Original line number Diff line number Diff line
@@ -60,8 +60,7 @@ 
#define EDID_QUIRK_FIRST_DETAILED_PREFERRED	(1 << 5)

/* use +hsync +vsync for detailed mode */

#define EDID_QUIRK_DETAILED_SYNC_PP		(1 << 6)

/* define the number of Extension EDID block */

#define MAX_EDID_EXT_NUM 4





#define LEVEL_DMT	0

#define LEVEL_GTF	1
@@ -114,14 +113,14 @@ static const u8 edid_header[] = { 
};



/**

 * edid_is_valid - sanity check EDID data

 * drm_edid_is_valid - sanity check EDID data

 * @edid: EDID data

 *

 * Sanity check the EDID block by looking at the header, the version number

 * and the checksum.  Return 0 if the EDID doesn't check out, or 1 if it's

 * valid.

 */

static bool edid_is_valid(struct edid *edid)

bool drm_edid_is_valid(struct edid *edid)

{

	int i, score = 0;

	u8 csum = 0;
@@ -163,6 +162,7 @@ bad: 
	}

	return 0;

}

EXPORT_SYMBOL(drm_edid_is_valid);



/**

 * edid_vendor - match a string against EDID's obfuscated vendor field
@@ -1069,8 +1069,8 @@ static int add_detailed_info_eedid(struct drm_connector *connector, 
	}



	/* Chose real EDID extension number */

	edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?

		       MAX_EDID_EXT_NUM : edid->extensions;

	edid_ext_num = edid->extensions > DRM_MAX_EDID_EXT_NUM ?

		DRM_MAX_EDID_EXT_NUM : edid->extensions;



	/* Find CEA extension */

	for (i = 0; i < edid_ext_num; i++) {
@@ -1152,7 +1152,7 @@ static int drm_ddc_read_edid(struct drm_connector *connector, 
	for (i = 0; i < 4; i++) {

		if (drm_do_probe_ddc_edid(adapter, buf, len))

			return -1;

		if (edid_is_valid((struct edid *)buf))

		if (drm_edid_is_valid((struct edid *)buf))

			return 0;

	}
@@ -1177,7 +1177,7 @@ struct edid *drm_get_edid(struct drm_connector *connector, 
	int ret;

	struct edid *edid;



	edid = kmalloc(EDID_LENGTH * (MAX_EDID_EXT_NUM + 1),

	edid = kmalloc(EDID_LENGTH * (DRM_MAX_EDID_EXT_NUM + 1),

		       GFP_KERNEL);

	if (edid == NULL) {

		dev_warn(&connector->dev->pdev->dev,
@@ -1195,14 +1195,14 @@ struct edid *drm_get_edid(struct drm_connector *connector, 
	if (edid->extensions != 0) {

		int edid_ext_num = edid->extensions;



		if (edid_ext_num > MAX_EDID_EXT_NUM) {

		if (edid_ext_num > DRM_MAX_EDID_EXT_NUM) {

			dev_warn(&connector->dev->pdev->dev,

				 "The number of extension(%d) is "

				 "over max (%d), actually read number (%d)\n",

				 edid_ext_num, MAX_EDID_EXT_NUM,

				 MAX_EDID_EXT_NUM);

				 edid_ext_num, DRM_MAX_EDID_EXT_NUM,

				 DRM_MAX_EDID_EXT_NUM);

			/* Reset EDID extension number to be read */

			edid_ext_num = MAX_EDID_EXT_NUM;

			edid_ext_num = DRM_MAX_EDID_EXT_NUM;

		}

		/* Read EDID including extensions too */

		ret = drm_ddc_read_edid(connector, adapter, (char *)edid,
@@ -1245,8 +1245,8 @@ bool drm_detect_hdmi_monitor(struct edid *edid) 
		goto end;



	/* Chose real EDID extension number */

	edid_ext_num = edid->extensions > MAX_EDID_EXT_NUM ?

		       MAX_EDID_EXT_NUM : edid->extensions;

	edid_ext_num = edid->extensions > DRM_MAX_EDID_EXT_NUM ?

		       DRM_MAX_EDID_EXT_NUM : edid->extensions;



	/* Find CEA extension */

	for (i = 0; i < edid_ext_num; i++) {
@@ -1303,7 +1303,7 @@ int drm_add_edid_modes(struct drm_connector *connector, struct edid *edid) 
	if (edid == NULL) {

		return 0;

	}

	if (!edid_is_valid(edid)) {

	if (!drm_edid_is_valid(edid)) {

		dev_warn(&connector->dev->pdev->dev, "%s: EDID invalid.\n",

			 drm_get_connector_name(connector));

		return 0;

drivers/gpu/drm/radeon/radeon_combios.c

+33 −0
Original line number Diff line number Diff line
@@ -443,6 +443,39 @@ static uint16_t combios_get_table_offset(struct drm_device *dev, 


}



bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev)

{

	int edid_info;

	struct edid *edid;

	edid_info = combios_get_table_offset(rdev->ddev, COMBIOS_HARDCODED_EDID_TABLE);

	if (!edid_info)

		return false;



	edid = kmalloc(EDID_LENGTH * (DRM_MAX_EDID_EXT_NUM + 1),

		       GFP_KERNEL);

	if (edid == NULL)

		return false;



	memcpy((unsigned char *)edid,

	       (unsigned char *)(rdev->bios + edid_info), EDID_LENGTH);



	if (!drm_edid_is_valid(edid)) {

		kfree(edid);

		return false;

	}



	rdev->mode_info.bios_hardcoded_edid = edid;

	return true;

}



struct edid *

radeon_combios_get_hardcoded_edid(struct radeon_device *rdev)

{

	if (rdev->mode_info.bios_hardcoded_edid)

		return rdev->mode_info.bios_hardcoded_edid;

	return NULL;

}



static struct radeon_i2c_bus_rec combios_setup_i2c_bus(struct radeon_device *rdev,

						       int ddc_line)

{

drivers/gpu/drm/radeon/radeon_display.c

+13 −1
Original line number Diff line number Diff line
@@ -352,6 +352,8 @@ static bool radeon_setup_enc_conn(struct drm_device *dev) 


int radeon_ddc_get_modes(struct radeon_connector *radeon_connector)

{

	struct drm_device *dev = radeon_connector->base.dev;

	struct radeon_device *rdev = dev->dev_private;

	int ret = 0;



	if ((radeon_connector->base.connector_type == DRM_MODE_CONNECTOR_DisplayPort) ||
@@ -366,7 +368,9 @@ int radeon_ddc_get_modes(struct radeon_connector *radeon_connector) 
	if (!radeon_connector->edid) {

		radeon_connector->edid = drm_get_edid(&radeon_connector->base, &radeon_connector->ddc_bus->adapter);

	}



	/* some servers provide a hardcoded edid in rom for KVMs */

	if (!radeon_connector->edid)

		radeon_connector->edid = radeon_combios_get_hardcoded_edid(rdev);

	if (radeon_connector->edid) {

		drm_mode_connector_update_edid_property(&radeon_connector->base, radeon_connector->edid);

		ret = drm_add_edid_modes(&radeon_connector->base, radeon_connector->edid);
@@ -829,6 +833,12 @@ int radeon_modeset_init(struct radeon_device *rdev) 
		return ret;

	}



	/* check combios for a valid hardcoded EDID - Sun servers */

	if (!rdev->is_atom_bios) {

		/* check for hardcoded EDID in BIOS */

		radeon_combios_check_hardcoded_edid(rdev);

	}



	if (rdev->flags & RADEON_SINGLE_CRTC)

		num_crtc = 1;
@@ -850,6 +860,8 @@ int radeon_modeset_init(struct radeon_device *rdev) 


void radeon_modeset_fini(struct radeon_device *rdev)

{

	kfree(rdev->mode_info.bios_hardcoded_edid);



	if (rdev->mode_info.mode_config_initialized) {

		radeon_hpd_fini(rdev);

		drm_mode_config_cleanup(rdev->ddev);

drivers/gpu/drm/radeon/radeon_mode.h

+5 −1
Original line number Diff line number Diff line
@@ -207,7 +207,8 @@ struct radeon_mode_info { 
	struct drm_property *tv_std_property;

	/* legacy TMDS PLL detect */

	struct drm_property *tmds_pll_property;



	/* hardcoded DFP edid from BIOS */

	struct edid *bios_hardcoded_edid;

};



#define MAX_H_CODE_TIMING_LEN 32
@@ -479,6 +480,9 @@ extern int radeon_crtc_cursor_set(struct drm_crtc *crtc, 
extern int radeon_crtc_cursor_move(struct drm_crtc *crtc,

				   int x, int y);



extern bool radeon_combios_check_hardcoded_edid(struct radeon_device *rdev);

extern struct edid *

radeon_combios_get_hardcoded_edid(struct radeon_device *rdev);

extern bool radeon_atom_get_clock_info(struct drm_device *dev);

extern bool radeon_combios_get_clock_info(struct drm_device *dev);

extern struct radeon_encoder_atom_dig *

include/drm/drm_crtc.h

+2 −0
Original line number Diff line number Diff line
@@ -801,4 +801,6 @@ extern struct drm_display_mode *drm_gtf_mode(struct drm_device *dev, 
				bool interlaced, int margins);

extern int drm_add_modes_noedid(struct drm_connector *connector,

				int hdisplay, int vdisplay);



extern bool drm_edid_is_valid(struct edid *edid);

#endif /* __DRM_CRTC_H__ */

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