On Thu, Oct 12, 2017 at 8:13 PM, Robert Tarasov
<tutankhamen@xxxxxxxxxxxx> wrote:
> Now DRM/UDL driver retreives all edid data blocks instead of only base one.
> Previous approch could lead to improper initialization of video mode with
> certain monitors.
>
> Signed-off-by: Robert Tarasov <tutankhamen@xxxxxxxxxxxx>
Reviewed-by: Alex Deucher <alexander.deucher@xxxxxxx>
> ---
> drivers/gpu/drm/udl/udl_connector.c | 106 +++++++++++++++++++++++-------------
> 1 file changed, 68 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/gpu/drm/udl/udl_connector.c b/drivers/gpu/drm/udl/udl_connector.c
> index 6a9250ac8f29..c3dc1fd20cb4 100644
> --- a/drivers/gpu/drm/udl/udl_connector.c
> +++ b/drivers/gpu/drm/udl/udl_connector.c
> @@ -17,42 +17,79 @@
> #include "udl_connector.h"
> #include "udl_drv.h"
>
> -/* dummy connector to just get EDID,
> - all UDL appear to have a DVI-D */
> -
> -static u8 *udl_get_edid(struct udl_device *udl)
> +static bool udl_get_edid_block(struct udl_device *udl, int block_idx,
> + u8 *buff)
> {
> - u8 *block;
> - char *rbuf;
> int ret, i;
> + u8 *read_buff;
>
> - block = kmalloc(EDID_LENGTH, GFP_KERNEL);
> - if (block == NULL)
> - return NULL;
> -
> - rbuf = kmalloc(2, GFP_KERNEL);
> - if (rbuf == NULL)
> - goto error;
> + read_buff = kmalloc(2, GFP_KERNEL);
> + if (!read_buff)
> + return false;
>
> for (i = 0; i < EDID_LENGTH; i++) {
> + int bval = (i + block_idx * EDID_LENGTH) << 8;
> ret = usb_control_msg(udl->udev,
> - usb_rcvctrlpipe(udl->udev, 0), (0x02),
> - (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2,
> - HZ);
> + usb_rcvctrlpipe(udl->udev, 0),
> + (0x02), (0x80 | (0x02 << 5)), bval,
> + 0xA1, read_buff, 2, HZ);
> if (ret < 1) {
> DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
> - goto error;
> + kfree(read_buff);
> + return false;
> }
> - block[i] = rbuf[1];
> + buff[i] = read_buff[1];
> }
>
> - kfree(rbuf);
> - return block;
> + kfree(read_buff);
> + return true;
> +}
>
> -error:
> - kfree(block);
> - kfree(rbuf);
> - return NULL;
> +static bool udl_get_edid(struct udl_device *udl, u8 **result_buff,
> + int *result_buff_size)
> +{
> + int i, extensions;
> + u8 *block_buff = NULL, *buff_ptr;
> +
> + block_buff = kmalloc(EDID_LENGTH, GFP_KERNEL);
> + if (block_buff == NULL)
> + return false;
> +
> + if (udl_get_edid_block(udl, 0, block_buff) &&
> + memchr_inv(block_buff, 0, EDID_LENGTH)) {
> + extensions = ((struct edid *)block_buff)->extensions;
> + if (extensions > 0) {
> + /* we have to read all extensions one by one */
> + *result_buff_size = EDID_LENGTH * (extensions + 1);
> + *result_buff = kmalloc(*result_buff_size, GFP_KERNEL);
> + buff_ptr = *result_buff;
> + if (buff_ptr == NULL) {
> + kfree(block_buff);
> + return false;
> + }
> + memcpy(buff_ptr, block_buff, EDID_LENGTH);
> + kfree(block_buff);
> + buff_ptr += EDID_LENGTH;
> + for (i = 1; i < extensions; ++i) {
> + if (udl_get_edid_block(udl, i, buff_ptr)) {
> + buff_ptr += EDID_LENGTH;
> + } else {
> + kfree(*result_buff);
> + *result_buff = NULL;
> + return false;
> + }
> + }
> + return true;
> + }
> + /* we have only base edid block */
> + *result_buff = block_buff;
> + *result_buff_size = EDID_LENGTH;
> + return true;
> + }
> +
> + kfree(block_buff);
> +
> + return false;
> }
>
> static int udl_get_modes(struct drm_connector *connector)
> @@ -84,33 +121,26 @@ static int udl_mode_valid(struct drm_connector *connector,
> static enum drm_connector_status
> udl_detect(struct drm_connector *connector, bool force)
> {
> - struct edid *edid;
> + u8 *edid_buff = NULL;
> + int edid_buff_size = 0;
> struct udl_device *udl = connector->dev->dev_private;
> struct udl_drm_connector *udl_connector =
> container_of(connector,
> struct udl_drm_connector,
> connector);
>
> + /* cleanup previous edid */
> if (udl_connector->edid != NULL) {
> kfree(udl_connector->edid);
> udl_connector->edid = NULL;
> }
>
> - edid = (struct edid *)udl_get_edid(udl);
> - if (!edid || !memchr_inv(edid, 0, EDID_LENGTH))
> - return connector_status_disconnected;
>
> - udl_connector->edid = edid;
> -
> - /*
> - * We only read the main block, but if the monitor reports extension
> - * blocks then the drm edid code expects them to be present, so patch
> - * the extension count to 0.
> - */
> - udl_connector->edid->checksum +=
> - udl_connector->edid->extensions;
> - udl_connector->edid->extensions = 0;
> + if (!udl_get_edid(udl, &edid_buff, &edid_buff_size))
> + return connector_status_disconnected;
>
> + udl_connector->edid = (struct edid *)edid_buff;
> +
> return connector_status_connected;
> }
>
> --
> 2.15.0.rc0.271.g36b669edcc-goog
>
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