From: Daniel Vetter Date: Sat, 12 May 2012 18:22:00 +0000 (+0200) Subject: drm/i915: fixup infoframe support for sdvo X-Git-Tag: v3.5-rc1~100^2~25^2~3 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=81014b9d0b55fb0b48f26cd2a943359750d532db;p=platform%2Fkernel%2Flinux-exynos.git drm/i915: fixup infoframe support for sdvo At least the worst offenders: - SDVO specifies that the encoder should compute the ecc. Testing also shows that we must not send the ecc field, so copy the dip_infoframe struct to a temporay place and avoid the ecc field. This way the avi infoframe is exactly 17 bytes long, which agrees with what the spec mandates as a minimal storage capacity (with the ecc field it would be 18 bytes). - Only 17 when sending the avi infoframe. The SDVO spec explicitly says that sending more data than what the device announces results in undefined behaviour. - Add __attribute__((packed)) to the avi and spd infoframes, for otherwise they're wrongly aligned. Noticed because the avi infoframe ended up being 18 bytes large instead of 17. We haven't noticed this yet because we don't use the uint16_t fields yet (which are the only ones that would be wrongly aligned). This regression has been introduce by 3c17fe4b8f40a112a85758a9ab2aebf772bdd647 is the first bad commit commit 3c17fe4b8f40a112a85758a9ab2aebf772bdd647 Author: David Härdeman Date: Fri Sep 24 21:44:32 2010 +0200 i915: enable AVI infoframe for intel_hdmi.c [v4] Patch tested on my g33 with a sdvo hdmi adaptor. Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=25732 Tested-by: Peter Ross (G35 SDVO-HDMI) Reviewed-by: Eugeni Dodonov Signed-Off-by: Daniel Vetter --- diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index d51f27f..3e09188 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -280,12 +280,12 @@ struct dip_infoframe { uint16_t bottom_bar_start; uint16_t left_bar_end; uint16_t right_bar_start; - } avi; + } __attribute__ ((packed)) avi; struct { uint8_t vn[8]; uint8_t pd[16]; uint8_t sdi; - } spd; + } __attribute__ ((packed)) spd; uint8_t payload[27]; } __attribute__ ((packed)) body; } __attribute__((packed)); diff --git a/drivers/gpu/drm/i915/intel_sdvo.c b/drivers/gpu/drm/i915/intel_sdvo.c index 7d3f238..125228e 100644 --- a/drivers/gpu/drm/i915/intel_sdvo.c +++ b/drivers/gpu/drm/i915/intel_sdvo.c @@ -887,17 +887,24 @@ static bool intel_sdvo_set_avi_infoframe(struct intel_sdvo *intel_sdvo) }; uint8_t tx_rate = SDVO_HBUF_TX_VSYNC; uint8_t set_buf_index[2] = { 1, 0 }; - uint64_t *data = (uint64_t *)&avi_if; + uint8_t sdvo_data[4 + sizeof(avi_if.body.avi)]; + uint64_t *data = (uint64_t *)sdvo_data; unsigned i; intel_dip_infoframe_csum(&avi_if); + /* sdvo spec says that the ecc is handled by the hw, and it looks like + * we must not send the ecc field, either. */ + memcpy(sdvo_data, &avi_if, 3); + sdvo_data[3] = avi_if.checksum; + memcpy(&sdvo_data[4], &avi_if.body, sizeof(avi_if.body.avi)); + if (!intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_HBUF_INDEX, set_buf_index, 2)) return false; - for (i = 0; i < sizeof(avi_if); i += 8) { + for (i = 0; i < sizeof(sdvo_data); i += 8) { if (!intel_sdvo_set_value(intel_sdvo, SDVO_CMD_SET_HBUF_DATA, data, 8))