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sunxi: video: Add sunxi_hdmi_edid_get_block helper function

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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>
This commit is contained in:
Hans de Goede 2014-12-20 14:01:48 +01:00
parent 5ee0bea49a
commit 63c5fbdfb9
1 changed files with 20 additions and 11 deletions
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31
drivers/video/sunxi_display.c
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@ -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);