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drm/i915: Tightly scope intel_encoder to prevent invalid use 

We reset intel_encoder for every matching encoder whilst iterating over
the encoders attached to this crtc when changing mode. As such in a
cloned configuration intel_encoder may not correspond to the correct
is_edp encoder.

By scoping intel_encoder to the loop, not only is the compiler able to
spot this mistake, we also improve readiability for ourselves.
[It might not be a mistake, within this function it is unclear as to
whether it is permissable for eDP to be cloned...]

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2010-08-22 10:54:23 +01:00
parent a25c25c2a2
commit 8e647a279c
1 changed files with 12 additions and 13 deletions
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25
drivers/gpu/drm/i915/intel_display.c
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@ -3508,10 +3508,9 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
u32 dpll = 0, fp = 0, fp2 = 0, dspcntr, pipeconf;
bool ok, has_reduced_clock = false, is_sdvo = false, is_dvo = false;
bool is_crt = false, is_lvds = false, is_tv = false, is_dp = false;
bool is_edp = false;
struct intel_encoder *has_edp_encoder = NULL;
struct drm_mode_config *mode_config = &dev->mode_config;
struct drm_encoder *encoder;
struct intel_encoder *intel_encoder = NULL;
const intel_limit_t *limit;
int ret;
struct fdi_m_n m_n = {0};
@ -3532,12 +3531,12 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
drm_vblank_pre_modeset(dev, pipe);
list_for_each_entry(encoder, &mode_config->encoder_list, head) {
struct intel_encoder *intel_encoder;
if (!encoder || encoder->crtc != crtc)
if (encoder->crtc != crtc)
continue;
intel_encoder = enc_to_intel_encoder(encoder);
switch (intel_encoder->type) {
case INTEL_OUTPUT_LVDS:
is_lvds = true;
@ -3561,7 +3560,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
is_dp = true;
break;
case INTEL_OUTPUT_EDP:
is_edp = true;
has_edp_encoder = intel_encoder;
break;
}
@ -3639,10 +3638,10 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
int lane = 0, link_bw, bpp;
/* eDP doesn't require FDI link, so just set DP M/N
according to current link config */
if (is_edp) {
if (has_edp_encoder) {
target_clock = mode->clock;
intel_edp_link_config(intel_encoder,
&lane, &link_bw);
intel_edp_link_config(has_edp_encoder,
&lane, &link_bw);
} else {
/* DP over FDI requires target mode clock
instead of link clock */
@ -3663,7 +3662,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
temp |= PIPE_8BPC;
else
temp |= PIPE_6BPC;
} else if (is_edp || (is_dp && intel_pch_has_edp(crtc))) {
} else if (has_edp_encoder || (is_dp && intel_pch_has_edp(crtc))) {
switch (dev_priv->edp_bpp/3) {
case 8:
temp |= PIPE_8BPC;
@ -3736,7 +3735,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
udelay(200);
if (is_edp) {
if (has_edp_encoder) {
if (dev_priv->lvds_use_ssc) {
temp |= DREF_SSC1_ENABLE;
I915_WRITE(PCH_DREF_CONTROL, temp);
@ -3885,7 +3884,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
dpll_reg = pch_dpll_reg;
}
if (!is_edp) {
if (!has_edp_encoder) {
I915_WRITE(fp_reg, fp);
I915_WRITE(dpll_reg, dpll & ~DPLL_VCO_ENABLE);
I915_READ(dpll_reg);
@ -3980,7 +3979,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
}
}
if (!is_edp) {
if (!has_edp_encoder) {
I915_WRITE(fp_reg, fp);
I915_WRITE(dpll_reg, dpll);
I915_READ(dpll_reg);
@ -4059,7 +4058,7 @@ static int intel_crtc_mode_set(struct drm_crtc *crtc,
I915_WRITE(link_m1_reg, m_n.link_m);
I915_WRITE(link_n1_reg, m_n.link_n);
if (is_edp) {
if (has_edp_encoder) {
ironlake_set_pll_edp(crtc, adjusted_mode->clock);
} else {
/* enable FDI RX PLL too */