On 10/30/2018 5:26 PM, Jani Nikula wrote:
This patch adds DSI packet payload to command payload
queue using credit based mechanism for *long* packets.
v2 by Jani:
- Add intel_dsi local variable for better code flow
- Use the new credit available helper
- Use int for free_credits, i, and j
v2 changes are fine.
Regards,
Madhav
Signed-off-by: Madhav Chauhan <madhav.chauhan@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/icl_dsi.c | 57 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 57 insertions(+)
diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index c7b77cd81e45..58774a1ac84b 100644
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -107,6 +107,33 @@ static void wait_for_cmds_dispatched_to_panel(struct intel_encoder *encoder)
}
}
+static bool add_payld_to_queue(struct intel_dsi_host *host, const u8 *data,
+ u32 len)
+{
+ struct intel_dsi *intel_dsi = host->intel_dsi;
+ struct drm_i915_private *dev_priv = to_i915(intel_dsi->base.base.dev);
+ enum transcoder dsi_trans = dsi_port_to_transcoder(host->port);
+ int free_credits;
+ int i, j;
+
+ for (i = 0; i < len; i += 4) {
+ u32 tmp = 0;
+
+ free_credits = payload_credits_available(dev_priv, dsi_trans);
+ if (free_credits < 1) {
+ DRM_ERROR("Payload credit not available\n");
+ return false;
+ }
+
+ for (j = 0; j < min_t(u32, len - i, 4); j++)
+ tmp |= *data++ << 8 * j;
+
+ I915_WRITE(DSI_CMD_TXPYLD(dsi_trans), tmp);
+ }
+
+ return true;
+}
+
static int dsi_send_pkt_hdr(struct intel_dsi_host *host,
struct mipi_dsi_packet pkt, bool enable_lpdt)
{
@@ -145,6 +172,25 @@ static int dsi_send_pkt_hdr(struct intel_dsi_host *host,
return 0;
}
+static int dsi_send_pkt_payld(struct intel_dsi_host *host,
+ struct mipi_dsi_packet pkt)
+{
+ /* payload queue can accept *256 bytes*, check limit */
+ if (pkt.payload_length > MAX_PLOAD_CREDIT * 4) {
+ DRM_ERROR("payload size exceeds max queue limit\n");
+ return -1;
+ }
+
+ /* load data into command payload queue */
+ if (!add_payld_to_queue(host, pkt.payload,
+ pkt.payload_length)) {
+ DRM_ERROR("adding payload to queue failed\n");
+ return -1;
+ }
+
+ return 0;
+}
+
static void dsi_program_swing_and_deemphasis(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
@@ -1052,6 +1098,17 @@ static ssize_t gen11_dsi_host_transfer(struct mipi_dsi_host *host,
if (ret < 0)
return ret;
+ /* only long packet contains payload */
+ if (mipi_dsi_packet_format_is_long(msg->type)) {
+ ret = dsi_send_pkt_payld(intel_dsi_host, dsi_pkt);
+ if (ret < 0)
+ return ret;
+ }
+
+ //TODO: add payload receive code if needed
+
+ ret = sizeof(dsi_pkt.header) + dsi_pkt.payload_length;
+
return ret;
}
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