From 0ea75e23356f73b4300492e04a62c90787a55c2d Mon Sep 17 00:00:00 2001 From: Sam Tygier Date: Thu, 23 Sep 2010 10:11:01 +0100 Subject: [PATCH] DRM: ignore invalid EDID extensions Currently an invalid EDID extension will cause the whole EDID to be considered invalid. Instead just drop the invalid extensions, and return the valid ones. The base block is modified to claim to have the number valid extensions, and the check sum is updated. For my EIZO S2242W the base block is fine, but the extension block is all zeros. Without this patch I get no X and no VTs. Signed-off-by: Sam Tygier Signed-off-by: Dave Airlie --- drivers/gpu/drm/drm_edid.c | 26 ++++++++++++++++++++------ 1 file changed, 20 insertions(+), 6 deletions(-) diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index c1a26217a530..a245d17165ae 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -240,7 +240,7 @@ drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, .addr = DDC_ADDR, .flags = I2C_M_RD, .len = len, - .buf = buf + start, + .buf = buf, } }; @@ -253,7 +253,7 @@ drm_do_probe_ddc_edid(struct i2c_adapter *adapter, unsigned char *buf, static u8 * drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) { - int i, j = 0; + int i, j = 0, valid_extensions = 0; u8 *block, *new; if ((block = kmalloc(EDID_LENGTH, GFP_KERNEL)) == NULL) @@ -280,14 +280,28 @@ drm_do_get_edid(struct drm_connector *connector, struct i2c_adapter *adapter) for (j = 1; j <= block[0x7e]; j++) { for (i = 0; i < 4; i++) { - if (drm_do_probe_ddc_edid(adapter, block, j, - EDID_LENGTH)) + if (drm_do_probe_ddc_edid(adapter, + block + (valid_extensions + 1) * EDID_LENGTH, + j, EDID_LENGTH)) goto out; - if (drm_edid_block_valid(block + j * EDID_LENGTH)) + if (drm_edid_block_valid(block + (valid_extensions + 1) * EDID_LENGTH)) { + valid_extensions++; break; + } } if (i == 4) - goto carp; + dev_warn(connector->dev->dev, + "%s: Ignoring invalid EDID block %d.\n", + drm_get_connector_name(connector), j); + } + + if (valid_extensions != block[0x7e]) { + block[EDID_LENGTH-1] += block[0x7e] - valid_extensions; + block[0x7e] = valid_extensions; + new = krealloc(block, (valid_extensions + 1) * EDID_LENGTH, GFP_KERNEL); + if (!new) + goto out; + block = new; } return block; -- 2.34.1