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msm: mdss: dp: edid: read all extension blocks

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A sink can have more than one EDID blocks. The extension
block count is provided in the first block. Not reading
all blocks can result in DP compliance failures.
Read all the extension blocks as mentioned in the first
block to avoid any EDID related compliance failures.

Change-Id: I9cfe6403da511e6af3b887fcf858109852e9844c
Signed-off-by: Ajay Singh Parmar <aparmar@codeaurora.org>
This commit is contained in:
Ajay Singh Parmar 2016-12-17 00:39:15 -08:00
parent 03a1feb1b6
commit 0261d58543
1 changed files with 12 additions and 5 deletions
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17
drivers/video/fbdev/msm/mdss_dp_aux.c
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@ -734,8 +734,10 @@ int mdss_dp_edid_read(struct mdss_dp_drv_pdata *dp)
int rlen, ret = 0;
int edid_blk = 0, blk_num = 0, retries = 10;
bool edid_parsing_done = false;
const u8 cea_tag = 0x02;
const u8 cea_tag = 0x02, start_ext_blk = 0x1;
u32 const segment_addr = 0x30;
u32 checksum = 0;
char segment = 0x1;
ret = dp_aux_chan_ready(dp);
if (ret) {
@ -764,7 +766,7 @@ int mdss_dp_edid_read(struct mdss_dp_drv_pdata *dp)
ret = dp_edid_buf_error(rp->data, rp->len);
if (ret) {
pr_err("corrupt edid block detected\n");
goto end;
continue;
}
if (edid_parsing_done) {
@ -782,7 +784,6 @@ int mdss_dp_edid_read(struct mdss_dp_drv_pdata *dp)
rp->data);
edid_parsing_done = true;
checksum = rp->data[rp->len - 1];
} else {
edid_blk++;
blk_num++;
@ -800,11 +801,17 @@ int mdss_dp_edid_read(struct mdss_dp_drv_pdata *dp)
memcpy(dp->edid_buf + (edid_blk * EDID_BLOCK_SIZE),
rp->data, EDID_BLOCK_SIZE);
checksum = rp->data[rp->len - 1];
/* break if no more extension blocks present */
if (edid_blk == dp->edid.ext_block_cnt)
goto end;
break;
/* write segment number to read block 3 onwards */
if (edid_blk == start_ext_blk)
dp_aux_write_buf(dp, segment_addr, &segment, 1, 1);
} while (retries--);
end:
if (dp->test_data.test_requested == TEST_EDID_READ) {
pr_debug("sending checksum %d\n", checksum);
dp_aux_send_checksum(dp, checksum);