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<section id="drm-pl111-arm-primecell-pl110-and-pl111-clcd-driver">
<h1>drm/pl111 ARM PrimeCell PL110 and PL111 CLCD Driver<a class="headerlink" href="#drm-pl111-arm-primecell-pl110-and-pl111-clcd-driver" title="Link to this heading">¶</a></h1>
<p>The PL110/PL111 is a simple LCD controller that can support TFT
and STN displays. This driver exposes a standard KMS interface
for them.</p>
<p>The driver currently doesn’t expose the cursor. The DRM API for
cursors requires support for 64x64 ARGB8888 cursor images, while
the hardware can only support 64x64 monochrome with masking
cursors. While one could imagine trying to hack something together
to look at the ARGB8888 and program reasonable in monochrome, we
just don’t expose the cursor at all instead, and leave cursor
support to the application software cursor layer.</p>
<p>TODO:</p>
<ul class="simple">
<li><p>Fix race between setting plane base address and getting IRQ for
vsync firing the pageflip completion.</p></li>
<li><p>Read back hardware state at boot to skip reprogramming the
hardware when doing a no-op modeset.</p></li>
<li><p>Use the CLKSEL bit to support switching between the two external
clock parents.</p></li>
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