>From a121507f31e37a809dfa21c9756aa83f36d7acbf Mon Sep 17 00:00:00 2001
From: Arjan van de Ven <ar...@linux.intel.com>
Date: Mon, 23 Mar 2009 13:37:20 -0700
Subject: [PATCH] KMS: do a faster EDID
for some outputs (like LVDS), the current delays in the EDID reader are way
overkill.
This patch makes the EDID reader try twice; first with a 5x faster probe, and
if that fails, it probes at the current speed. This reduces probe time on my
LVDS
panel significantly.
Signed-off-by: Arjan van de Ven <ar...@linux.intel.com>
---
drivers/gpu/drm/drm_edid.c | 22 +++++++++++++---------
1 files changed, 13 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index a839a28..069b189 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -588,20 +588,22 @@ static unsigned char *drm_ddc_read(struct i2c_adapter
*adapter)
{
struct i2c_algo_bit_data *algo_data = adapter->algo_data;
unsigned char *edid = NULL;
+ int divider = 5;
int i, j;
algo_data->setscl(algo_data->data, 1);
- for (i = 0; i < 1; i++) {
+ for (i = 0; i < 2; i++) {
/* For some old monitors we need the
* following process to initialize/stop DDC
*/
+
algo_data->setsda(algo_data->data, 1);
- msleep(13);
+ msleep(13 / divider);
algo_data->setscl(algo_data->data, 1);
for (j = 0; j < 5; j++) {
- msleep(10);
+ msleep(10 / divider);
if (algo_data->getscl(algo_data->data))
break;
}
@@ -609,31 +611,33 @@ static unsigned char *drm_ddc_read(struct i2c_adapter
*adapter)
continue;
algo_data->setsda(algo_data->data, 0);
- msleep(15);
+ msleep(15 / divider);
algo_data->setscl(algo_data->data, 0);
- msleep(15);
+ msleep(15 / divider);
algo_data->setsda(algo_data->data, 1);
- msleep(15);
+ msleep(15 / divider);
/* Do the real work */
edid = drm_do_probe_ddc_edid(adapter);
algo_data->setsda(algo_data->data, 0);
algo_data->setscl(algo_data->data, 0);
- msleep(15);
+ msleep(15 / divider);
algo_data->setscl(algo_data->data, 1);
for (j = 0; j < 10; j++) {
- msleep(10);
+ msleep(10 / divider);
if (algo_data->getscl(algo_data->data))
break;
}
algo_data->setsda(algo_data->data, 1);
- msleep(15);
+ msleep(15 / divider);
algo_data->setscl(algo_data->data, 0);
algo_data->setsda(algo_data->data, 0);
+
if (edid)
break;
+ divider = 1;
}
/* Release the DDC lines when done or the Apple Cinema HD display
* will switch off
--
1.6.0.6
--
Arjan van de Ven Intel Open Source Technology Centre
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