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authorHans de Goede <hdegoede@redhat.com>2014-12-20 14:01:48 +0100
committerHans de Goede <hdegoede@redhat.com>2015-01-14 14:56:38 +0100
commit63c5fbdfb9f4c4f735f5f8d21f2c6156cc5c6546 (patch)
tree3a05ce2a7fa2499d64055fa8ed3c7e36fc231b6a /drivers/video
parent5ee0bea49ab8a150fc3c1f4def7b72df101db662 (diff)
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sunxi: video: Add sunxi_hdmi_edid_get_block helper function
Add a sunxi_hdmi_edid_get_block helper function, this is a preparation patch for adding support for parsing EDID extension blocks. Signed-off-by: Hans de Goede <hdegoede@redhat.com> Acked-by: Ian Campbell <ijc@hellion.org.uk> Acked-by: Anatolij Gustschin <agust@denx.de>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/sunxi_display.c31
1 files changed, 20 insertions, 11 deletions
diff --git a/drivers/video/sunxi_display.c b/drivers/video/sunxi_display.c
index 394153a..3048410 100644
--- a/drivers/video/sunxi_display.c
+++ b/drivers/video/sunxi_display.c
@@ -137,6 +137,24 @@ static int sunxi_hdmi_ddc_read(int offset, u8 *buf, int count)
return 0;
}
+static int sunxi_hdmi_edid_get_block(int block, u8 *buf)
+{
+ int r, retries = 2;
+
+ do {
+ r = sunxi_hdmi_ddc_read(block * 128, buf, 128);
+ if (r)
+ continue;
+ r = edid_check_checksum(buf);
+ if (r) {
+ printf("EDID block %d: checksum error%s\n",
+ block, retries ? ", retrying" : "");
+ }
+ } while (r && retries--);
+
+ return r;
+}
+
static int sunxi_hdmi_edid_get_mode(struct ctfb_res_modes *mode)
{
struct edid1_info edid1;
@@ -146,7 +164,7 @@ static int sunxi_hdmi_edid_get_mode(struct ctfb_res_modes *mode)
(struct sunxi_hdmi_reg *)SUNXI_HDMI_BASE;
struct sunxi_ccm_reg * const ccm =
(struct sunxi_ccm_reg *)SUNXI_CCM_BASE;
- int i, r, retries = 2;
+ int i, r;
/* SUNXI_HDMI_CTRL_ENABLE & PAD_CTRL0 are already set by hpd_detect */
writel(SUNXI_HDMI_PAD_CTRL1 | SUNXI_HDMI_PAD_CTRL1_HALVE,
@@ -170,16 +188,7 @@ static int sunxi_hdmi_edid_get_mode(struct ctfb_res_modes *mode)
SUNXI_HMDI_DDC_LINE_CTRL_SCL_ENABLE, &hdmi->ddc_line_ctrl);
#endif
- do {
- r = sunxi_hdmi_ddc_read(0, (u8 *)&edid1, 128);
- if (r)
- continue;
- r = edid_check_checksum((u8 *)&edid1);
- if (r) {
- printf("EDID: checksum error%s\n",
- retries ? ", retrying" : "");
- }
- } while (r && retries--);
+ r = sunxi_hdmi_edid_get_block(0, (u8 *)&edid1);
/* Disable DDC engine, no longer needed */
clrbits_le32(&hdmi->ddc_ctrl, SUNXI_HMDI_DDC_CTRL_ENABLE);